path: root/CHANGES

SWIG (Simplified Wrapper and Interface Generator)

The Stable Development Branch
=============================

In this CVS branch "rel-1-3", fixes in the SWIG core and improvements
to the language modules take place, starting from the stable release
1.3.6.

Eventually this branch will be merged back to the trunk of the CVS
tree (maybe).

Version 1.3.18 (In progress)
============================

Due to the size of the CHANGES file, please add change entries to the
file CHANGES.current.  It will be merged into this file before
release.  -- Dave

Version 1.3.17 (November 22, 2002)
==================================
11/19/2002: beazley
            Fixed [ 613922 ] preprocessor errors with HAVE_LONG_LONG.
            
11/19/2002: beazley
            Fixed [ 615480 ] mzscheme SWIG_MustGetPtr_.

11/19/2002: beazley
            Fixed [ 635119 ] SWIG_croak causes compiler warning.

11/16/2002: cheetah (William Fulton)
            [Java] Added typemaps for pointers to class members.

11/15/2002: cheetah (William Fulton)
            [Java] Bug fix: Overloaded C++ functions which cannot be overloaded in Java 
            once again issue a warning.

11/14/2002: cheetah (William Fulton)
            [Java] Handling of NULL pointers is improved. A java null object will now
            be translated to and from a NULL C/C++ pointer by default. Previously when 
            wrapping:

                class SomeClass {...};
                void foo(SomeClass *s);

            and it was called from Java with null:

                modulename.foo(null)

            a Java NullPointerException was thrown. Extra typemaps had to be written in
            order to obtain a NULL pointer to pass to functions like this one. Now the 
            default wrapping will detect 'null' and translate it into a NULL pointer.
            Also if a function returns a NULL pointer, eg:
            
                SomeClass *bar() { return NULL; }
            
            Then this used to be wrapped with a SomeClass proxy class holding a NULL
            pointer. Now null is returned instead. These changes are subtle but useful.
            The original behaviour can be obtained by using the original typemaps:

                %typemap(javaout) SWIGTYPE {
                    return new $&javaclassname($jnicall, true);
                  }
                %typemap(javaout) SWIGTYPE *, SWIGTYPE &, SWIGTYPE [] {
                    return new $javaclassname($jnicall, $owner);
                  }
                %typemap(javagetcptr) SWIGTYPE, SWIGTYPE *, SWIGTYPE &, SWIGTYPE [] %{
                  protected static long getCPtr($javaclassname obj) {
                    return obj.swigCPtr;
                  }
                %}

            *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***


11/12/2002: beazley
            Fixed problem with abstract methods and signatures.  For example:

            class abstract_foo { 
            public: 
                virtual int   meth(int meth_param) = 0; 
            }; 
 
 
            class abstract_bar : public abstract_foo { 
            public: 
                int meth(int meth_param_1, int meth_param_2) { return 0; }
            };

            In this case, abstract_bar is still abstract.

            Fixes [ 628438 ] Derived abstract class not abstract.
            Reported and patched by Scott Michel.

11/11/2002: beazley
            Fixed a matching problem with typemaps and array dimensions.  For example, if you
            had this:

               typedef char blah[20];

            and a typemap:

               %typemap() char [ANY] {
                   ... $1_dim0 ...
               }

            then $1_dim* variables weren't be expanded properly.  It should work now.
            Problem reported by Pankaj Kumar Goel.
               
11/07/2002: mkoeppe
	    Added an experimental new module that dumps SWIG's parse
	    tree as (Common) Lisp s-expressions.  The module is
	    invoked with SWIG's -sexp command-line switch.  The output
	    can be read into Common Lisp.  There is (prototype)
	    example Lisp code that generates Foreign Function Interface
	    definitions for use with Kevin Rosenberg's UFFI.

	    *** EXPERIMENTAL NEW FEATURE ***

11/07/2002: mkoeppe
	    Removed duplicate declaration of "cpp_template_decl" in
	    parser.y; bison 1.75 complained.

11/06/2002: cheetah (William Fulton)
            [Java] Default primitive array handling has changed like arrays of classes. 
            C primitive arrays are no longer wrapped by a Java array but with a pointer 
            (type wrapper class). Again the changes have been made for efficiency reasons. 
            The original typemaps have been moved into arrays_java.i, so the original 
            behaviour can be obtained merely including this file:

                %include "arrays_java.i"

            The array support functions are no longer generated by default. They are only
            generated when including this file, thus this often unused code is only
            generated when specifically requiring this type of array support.

            *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***

11/05/2002: ljohnson (Lyle Johnson)
            [Ruby] Added support for nested module declarations (as was
            previously added for the Perl module). So a %module directive
            of the form:

                %module "Outer::Inner::Foo"

            will nest everything as (in Ruby code):

                module Outer
                  module Inner
                    module Foo
                      # stuff goes here
                    end
                  end
                end
 
11/05/2002: mkoeppe 
	    [MzScheme] Add an argument (-declaremodule) that generates
	    code to correctly declare a primitive module extension.
	    Patch submitted by Bruce Butterfield.

11/02/2002: cheetah (William Fulton)
            [Java] Added patch submitted by Michael Cahill to remove unused parameter
            warnings for the jenv and cls parameters. This patch also also allows one
            to use "void" in the jni typemap for any type without code being generated
            attempting to return a value.

10/29/2002: cheetah (William Fulton)
            [Java] Array handling is different. Arrays of classes are no longer wrapped
            with proxy arrays, eg wrapping

                class X {...};
                X foo[10];
            
            used to be wrapped with these Java getters and setters:

                public static void setFoo(X[] value) {...}
                public static X[] getFoo() {...}

            This approach is very inefficient as the entire array is copied numerous
            times on each invocation of the getter or setter. These arrays are now
            wrapped with a pointer so it is only possible to access the first array element 
            using a proxy class:

                public static void setFoo(X value) {...}
                public static X getFoo() {...}

            Arrays of enums have also been similarly changed. This behaviour is now like the 
            other SWIG language's implementation and the array library should be used to 
            access the other elements. The original behaviour can be achieved using the 
            macros and typemaps in arrays_java.i, for example:

                %include "arrays_java.i"
                JAVA_ARRAYSOFCLASSES(X)
                class X {...};
                X foo[10];

            *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***

10/29/2002: cheetah (William Fulton)
            [Java] Two new typemaps javain and javaout for generating the proxy class 
            and type wrapper class method calls to the JNI class. The new typemaps are 
            really used for transforming the jstype (used in proxy class and type wrapper
            classes) to the jtype (used in the JNI class) and visa versa. A javain typemap
            is required whenever an in typemap is written and similarly javaout for an out
            typemap. An example is probably best to show them working:

                %typemap(javain) Class "Class.getCPtr($javainput)"
                %typemap(javain) unsigned short "$javainput"
                %typemap(javaout) Class * {
                    return new Class($jnicall, $owner);
                  }

                %inline %{
                    class Class {};
                    Class * bar(Class cls, unsigned short ush) { return new Class(); };
                %}

            The generated proxy code is then:

                public static Class bar(Class cls, int ush) {
                  return new Class(exampleJNI.bar(Class.getCPtr(cls), ush), false);
                }


            Some new special variables have been introduced in order to use these typemaps.
            Here $javainput has been replaced by 'cls' and 'ush'. $jnicall has been replaced by 
            the native method call, 'exampleJNI.bar(...)' and $owner has been replaced by 'false'.
            $javainput is analogous to the $input special variable. It is replaced by the parameter name.
            $jnicall is analogous to $action in %exception. It is replaced by the call to the native
            method in the JNI class.
            $owner is replaced by either true if %newobject has been used otherwise false.

            The java.swg file contains default javain and javout typemaps which will produce the same code
            as previously. This change is only of concern to those who have written their own typemaps as
            you will then most likely have to write your own javain and javaout typemaps.

            The javaout typemap also makes it possible to use a Java downcast to be used on abstract 
            proxy base classes. See the Java documentation on dynamic_cast.

            *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***

10/24/2002: ttn
	    [Methodology] Upgaded to libtool 1.4.3, presumably w/ better
	    support for newish platforms (like MacOS X).

10/21/2002: ttn
	    Fixed Runtime/Makefile.in bug -- thanks to Richard Calmbach.

10/18/2002: ttn
	    Fixed typo in doh.h -- thanks to Max Horn.

Version 1.3.16 (October 14, 2002)
=================================

10/13/2002: beazley
            Fixed bug with %extend directive and %feature reported
            by William Fulton.

10/13/2002: beazley
            Added OpenVMS build directory (vms).  Contributed by 
            Jean-François Pieronne.

10/09/2002: cheetah (William Fulton)
            [Java] Added throws clause to the native functions in the JNI class.
            The throws clause is the same as the one generated for proxy functions
            and module class functions.

09/27/2002: beazley
            Fixed some problems with the %import directive and classes that
            were defined but not wrapped.  Problem reported by Leslie Brooks,
            Gerry Woods, and others.

09/23/2002: cheetah (William Fulton)
            [Java] Some error checking added:
            1) OutOfMemoryException check in the char * typemaps. 
            2) As SWIG treats pointers, references and passing by value all the
            same, it is possible to pass a NULL pointer to a function that expects
            an object passed by value or by reference. A NullPointerException is 
            now thrown under this scenario.

09/20/2002: ttn
	    [Methodology] Reworked "make clean" and "make install"
			  to be more table driven.
	    [Docs] Explain how to extend "make install" w/ extra-install.list.

09/15/2002: beazley
            Deprecation of the "ignore" typemap.   The "ignore" typemap has
            been deprecated in favor of a generalization of the "in" typemap.
            To ignore an argument, use something like this instead:

                %typemap(in,numinputs=0) int *output (int temp) {
                     $1 = &temp;
                }

            This change fixes a number of subtle bugs related to the interaction
            of the "in" and "ignore" typemaps (which were supposed to be
            mutually exclusive).

            The use of the numinputs argument is reserved for future expansion.
            Currently, values >1 will generate an error.  However, future
            releases of SWIG may utilize that to support multi-input typemaps.

            %typemap(ignore) still works, but generates a warning message and is
            translated to %typemap(in,numinputs=0).

            *** POTENTIAL INCOMPATIBILITY ***
            *** NEW FEATURE ***

09/15/2002: beazley
            Fixed segmentation fault for unnamed structures.  For example:

               typedef struct {
               } *blah;


            Reported by Roger Gibson.
            Note: we might be able to generate wrappers in special cases.

09/13/2002: beazley
            Minor modification to generated wrapper functions.  Pointer arguments are now
            always set to an initial value of 0.   Simplifies typemap writing and cleanup
            code (since you can rely on zero-value initialization).   This also greatly
            reduces the need to ever write an "arginit" typemap.

09/12/2002: beazley
            Minor enhancement to smart-pointer support.  If operator->()
            is part of an ignored base class like this,

                 %ignore Bar;

                 class Foo {
                 public:
                     int blah();
                 };

                 class Bar {         /* Ignored */
                 public:
                     ...
                     Foo *operator->();
                     ...
                 };

                 class Spam : public Bar { };

            then methods from Foo are still available.  For example,

                 >>> s = Spam()
                 >>> s.blah()
                 0
                 >>>

             The only catch is that the operator->() itself is not available
             (since it wasn't wrapped).   Therefore, there won't be any
             __deref__() operation unless it is explicitly added to Spam
             (either using %extend or just placing operator->() in the
             definition of Spam).

09/11/2002: ttn
	    [Methodology] Reworked "make check" to be more table driven.
	    [Docs] Docuemented methodology in Manual/Extending.html.

09/11/2002: ttn
	    [Docs] Prefixed Manual/*.html with "<!DOCTYPE html ...>" to
	    pander dotingly to (over-)sensitive editors.

09/10/2002: ttn
	    [Guile] Converted Examples/guile/simple "make check"
	    behavior to actually check execution results.  Reduced
	    iteration counts so that the test doesn't take too long.

09/10/2002: beazley
            SWIG-1.3.15 released.


Version 1.3.15 (September 9, 2002)
==================================
09/09/2002: beazley
            Fixed nasty runtime type checking bug with subtypes and inheritance
            and templates. 

09/09/2002: cheetah (William Fulton)
            [Java] Java exception classes for a method's throws clause can be generated by 
            specifying them in a comma separated list in the throws attribute in any one
            of the following typemaps: in, out, check, freearg, argout and throws. A classic
            example would be to convert C++ exceptions into a standard Java exception:

                %typemap(throws, throws="java.io.IOException") file_exception {
                    jclass excep = jenv->FindClass("java/io/IOException");
                    if (excep)
                        jenv->ThrowNew(excep, _e.what());
                    return $null; // or use SWIG_fail
                }

                class file_exception {...};
                void open(const char *filename) throw(file_exception);

            The Java method will then be declared with a throws clause:

                public static void open(String filename) throws java.io.IOException {...}

09/08/2002: mkoeppe
	  * [Guile] Improved the documentation system.  The arglist no
	    longer gets cluttered with type specification, making it
	    more readable.  (Also the ILISP function C-u M-x
	    `arglist-lisp' RET works better this way.)  The types of
	    arguments are explained in an extra sentence after the
	    arglist. 
	    
	    There are now two documentation-related typemap arguments:

	        %typemap(in, doc="$NAME is a vector of integers", 
			 arglist="$name")  int *VECTOR { ... }
			 
            The "arglist" texts of all arguments of a function make up
	    its arglist in the documentation.  The "doc" texts of all
	    arguments are collected to make a sentence that describes
	    the types of the arguments.  Reasonable defaults are
	    provided. 

	    As usual, $name is substituted by the name of the
	    argument. The new typemap variable $NAME is like $name,
	    but marked-up as a variable.  This means that it is
	    upper-cased; in TeXinfo mode ("-procdocformat texinfo") it
	    comes out as @var{name}. 
	    
	    The directives %values_as_list, %values_as_vector,
	    %multiple_values now also have an effect on the
	    documentation. (This is achieved via the new pragmas
	    return_nothing_doc, return_one_doc, return_multi_doc.)

	    Documentation has also improved for variables that are
	    wrapped as procedures-with-setters (command-line switch
	    "-emit-setters").

          * [Guile] Emit constants as _immutable_ variables.  (This
            was broken recently.)

09/07/2002: mkoeppe
	    [Guile] Updated the typemaps in list-vector.i.

09/07/2002: mkoeppe
	    Short-circuit the typechecks for overloaded functions.
	    (The changes in code generation are visible in the new
	    testcase "overload_complicated".)

09/06/2002: cheetah (William Fulton)
            [Java] Solution for [ 596413 ]
            New typemap so that the Java proxy classes and type wrapper classes
            wrapper constructor modifier can be tailored by users. The default value is 
            protected. Normally SWIG generates a constructor like this which can only 
            be accessed within one package:

              protected Bar(long cPtr, boolean cMemoryOwn) {
              ...
              }
            
            If you are using SWIG across multiple packages or want to use this constructor
            anyway, it can now be accessed outside the package. To modify use for example:

              %typemap(javaptrconstructormodifiers) SWIGTYPE "public"

            to change to public for all proxy classes and similarly for all type wrapper classes:
            
              %typemap(javaptrconstructormodifiers) SWIGTYPE, SWIGTYPE *, SWIGTYPE &, SWIGTYPE [] "public"

09/06/2002: cheetah (William Fulton)
            [Java] Added throws typemaps for the Java module. C++ exceptions get converted into
            java.lang.RuntimeException Java exceptions. 
            
            Warning: This may change from java.lang.Runtime exception in the future.

09/05/2002: cheetah (William Fulton)
            [Java] Fix for variables declared as references.

09/05/2002: beazley
            Fixed [ 605162 ] Typemap local variables. Reported by Lyle Johnson.

09/05/2002: ljohnson (Lyle Johnson)
            [Ruby] More updates to the Ruby module documentation, including
	    a new typemap example that demonstrates how to collect key-value
	    pairs from an argument list into a Hash.

09/05/2002: beazley
            Fixed bug with template expansion and constructors.

                template<class T> class Foo {
                public:
                    Foo<T>() { }
                };

            The extra <T> in the constructor was carried through in the
            name--causing runtime problems in generated modules.
            Reported by Jordi Arnabat Benedicto.
 
09/05/2002: mkoeppe
	    [Guile] Support overloading.

09/04/2002: ljohnson (Lyle Johnson)
            [Ruby] Updated typemaps for long long and unsigned long long types
	    to use Ruby 1.7 support for these types when available.

09/04/2002: ljohnson (Lyle Johnson)
            [Ruby] Added output typemaps for const reference to primitive
	    types.

09/04/2002: mkoeppe
	    [Guile] Fix pass-by-value typemaps.  Reported by Arno
	    Peters via Debian bugtracking (#156902), patch by Torsten
	    Landschoff <torsten@debian.org>.

09/03/2002: samjam (Sam Liddicott)
	    Better reference support.
	    Functions that want a void** can take a NULL by reference and
	    the void* will be made for you and then passed-by-reference

	    Also all integer-class native types can be passed by reference
	    where an int* or int& etc is needed

09/03/2002: beazley
            Changed the evaluation order of preprocessor macro arguments.
            Arguments are now expanded by the preprocessor *before* they
            are passed to macro expansion.  This fixes a subtle expansion
            bug reported by Anthony Heading.

09/03/2002: beazley
            Fixed the file include order (again, apparently). See 2/27/99.

09/02/2002: beazley
            [Perl] Better exception handling support.  Since Perl error handling
            relies on setjmp/longjmp, wrapper functions have been modified slightly
            to provide an extra block scope:

                XS(foo) {
                   char _swigmsg[SWIG_MAX_ERRMSG] = "";
                   const char *_swigerr = _swigmsg;
                   {
                      /* Normal wrapper function here */
                      ...
                      SWIG_croak("An error occurred\n");
                      ...
                      XSRETURN(argvi);      /* Successful return */
                      fail:
                        /* cleanup code */
                   }
                   croak(_swig_err);
                }

            The macro SWIG_croak(x) sets the value of _swigerr to x and
            executes a "goto fail".  The whole wrapper function is enclosed
            block scope to provide proper cleanup of C++ objects.  Since
            croak executes a longjmp(), there is no way to properly reclaim
            resources if this executes in the same scope as the wrapper
            function.

            The _swigmsg[] variable is normally unused, but can be used
            to store small error messages using sprintf or snprintf. It
            has a capacity of at least 256 bytes (SWIG_MAX_ERRMSG).
            
09/02/2002: beazley
            [Tcl] Added better support for exceptions.  Instead of returning TCL_ERROR,
            use the macro SWIG_fail to return with an error.  This ensures that
            arguments are properly cleaned up.  Exception specifiers are now
            handled by default.

09/02/2002: ljohnson (Lyle Johnson)
            [Ruby] The type-checking system for the Ruby module has had a flaw
	    in that some types which should be considered equivalent
	    weren't. This bug was best demonstrated by the inherit_missing.i
	    test suite case, which defines a base class "Foo" that is
	    subclassed by "Bar". The "Foo" class isn't actually wrapped (i.e.
	    it's not directly accessible from Ruby) but we'd still like to be
	    able to pass "Bar" instances to functions expecting Foos and have
	    that work; it wasn't. The revised implementation (similar to that
	    used for some other language modules) adds a new instance variable
	    (__swigtype__) to each object that indicates its SWIG type;
	    that is, each "Bar" instance will now have a string instance
	    variable called "__swigtype__" whose value is "_p_Bar".

            Unless developers were taking advantage of this low-level
	    implementation detail, they shouldn't notice any compatibility
	    problems; nevertheless, I'm marking it as a "potential
	    incompatibility".

            *** POTENTIAL INCOMPATIBILITY ***

09/01/2002: ljohnson (Lyle Johnson)
            [Ruby] Fixed SF Bug #603199.

08/08/2002: cheetah (William Fulton)
            [Java] Added OUTPUT, INPUT and INOUT typemaps in typemaps.i for C++ 
            references.

08/27/2002: mkoeppe
	    [Guile] Fixed error in "lib_std_vector" testcase and
	    compiler warning in "lib_cdata" testcase.

08/27/2002: ljohnson (Lyle Johnson)
            [Ruby] Added the "%mixin" directive, which allows the user to
	    specify a comma-separated list of module names to mix-in to a
	    class. So, for example, if you'd like to specify that Ruby's
	    Enumerable module should be mixed-in to your class Foo, you'd
	    write:
	    
	        %mixin Foo "Enumerable";
		
            or to specify that the modules Fee, Fie and Fo should be mixed
	    in to Foo:
	    
	        %mixin Foo "Fee,Fie,Fo";
		
	    *** NEW FEATURE ***

08/27/2002: ljohnson (Lyle Johnson)
            [Ruby] Modified the %alias directive so that multiple aliases
	    can be specified for an instance method by using a comma-separated
	    list of aliases.

08/27/2002: ljohnson (Lyle Johnson)
            [Ruby] Added "throw" typemaps for the Ruby module.

08/26/2002: beazley
            Two new command line options for printing dependencies.
            'swig -M' lists all file dependencies.  'swig -MM' lists
            dependencies, but excludes files in the SWIG library. 
            Example:

               % swig -M -python example.i
               example_wrap.cxx: \
                /u0/beazley/Projects/lib/swig1.3/swig.swg \
                /u0/beazley/Projects/lib/swig1.3/python/python.swg \
                example.i \
                example.h 

               % swig -MM -python example.i
               example_wrap.cxx: \
                example.i \
                example.h 

            *** NEW FEATURE ***

08/26/2002: beazley
            Fixed [ 597599 ] union in class: incorrect scope.
            Reported by Art Yerkes.

08/26/2002: beazley
            Fixed [ 600132 ] Default argument with namespace. 
            Reported by Shibukawa Yoshiki.
 
08/24/2002: beazley
            Automatic C++ exception handling enabled for all language modules.    This is
            pretty simple.  If you have a class like this:

                class Foo {
                };
                class Bar {
                public:
                    void blah() throw(Foo);
                }

            then the generated wrapper code looks like this:

                  wrap_Bar_blah() {
                       ...
                       try {
                           arg1->blah();
                       } 
                       catch (Foo &_e) {
                           /* "throw" typemap code inserted. $1 = _e */
                       }
                       catch (...) {
                          throw;
                       }
                  }
            The "throw" typemap can be used to raise an error in the target 
            language.  It can do anything.  Here is a very simple example:

                 %typemap("throw") Foo {
                     PyErr_SetString(PyExc_RuntimeError, "Foo exception");
                     return NULL;
                 }

            To make this work in each language module, simply define a few default
            "throw" typemaps for SWIGTYPE, SWIGTYPE *, int, const char *, and a
            few common exception types.   That's all there is to it.

            Automatic exception handling can be disabled using -noexcept or
            setting the NoExcept global variable to 1.
            *** NEW FEATURE ***

08/23/2002: beazley
            [ Python ]
            Automatic translation of C++ exception specifications into error handling code.
            For example:
 
                class Foo {
                };
                class Bar {
                public:
                    void blah() throw(Foo);
                }

            In this case, Foo is wrapped as a classic-style class (compatible
            with exception handling).  Furthermore, you can write Python code
            like this:

                b = Bar()
                try:
                    b.blah();
                except Foo,e:     # Note use of exception class here!
                    # Handle Foo error
                    ...

            The object "e" in the exception handler is just a wrapped Foo
            object.  Access it like a normal object.

            If an exception is not wrapped as a class, a RuntimeError
            exception is raised.  The argument to this exception is
            the exception object.  For example:
 
                class Bar {
                public:
                    void blah() throw(int);
                }

                b = Bar()
                try:
                   b.blah();
                except RuntimeError,e:
                   print e.args[0]       # Integer exception value

            Comments:

                -  If a class is used as an exception, it *must* be wrapped
                   as a Python classic-style class (new classes don't work).

                -  Automatic exception handling is compatible with %exception.

                -  Use -noexcept to turn off this feature.

                -  The newly introduced "throw" typemap is used to raise
                   Python errors (naturally).

            *** EXPERIMENTAL NEW FEATURE ***

08/23/2002: beazley
            Information from throw() specifiers is now stored in the parse
            tree.  For example:

                class Foo {
                public:
                     int blah() throw(spam,bar);
                }

            The stored information is fully corrected for namespaces and works
            with templates.  Uses will follow.
            
08/22/2002: beazley
            Exception handling code is no longer applied to member access
            function.  For example, in this code

                %exception {
                   try {
                      $action
                   } catch(whatever) {
                      ...
                   }
                }

                class Foo {
                public:
                    int x;
                    ...
                }

            The exception handling code is not applied to accessor functions
            for Foo::x.   This should reduce the amount of extra code
            generated.

            Caveat:  Exception handling code *is* used when attributes are
            accessed through a smart-pointer or a synthesized attributed
            added with %extend is used.

08/22/2002: beazley
            Made more patches to hopefully eliminate problems when compiling SWIG 
            as a 64-bit executable.

08/22/2002: beazley
            Fixed a bug with const reference members, variables, and static members.
            For example:

                  class Foo {
                  public:
                       static const int &ref;
                  };

            SWIG was trying to generate "set" functions which wouldn't compile. 

08/21/2002: beazley
            Made the warning message for "Class X might abstract" off by default.
            Enable with -Wall.

08/21/2002: beazley
            Refined handling of const and non-const overloaded methods.  If
            a class defines a method like this:

                class Foo {
                public:
                    int bar(int);
                    int bar(int) const;
                }

            Then the non-const method is *always* selected in overloading and
            the const method silently discarded.  If running with -Wall, a warning
            message will be generated.

08/19/2002: beazley
            Better support for using declarations and inheritance.   Consider this:

                class Foo {
                public:
                      int blah(int x);
                };

                class Bar {
                public:
                      double blah(double x);
                };

                class FooBar : public Foo, public Bar {
                public:
                      char *blah(char *x);
                      using Foo::blah;
                      using Bar::blah;
                };

            Now SWIG wraps FooBar::blah as an overloaded method that uses all
            accessible versions of blah().  See section 15.2.2 in Stroustrup, 3rd Ed.

            SWIG also supports access change through using declarations.  For example:

                class Foo {
                protected:
                     int x;
                     int blah(int x);
                };

                class Bar : public Foo {
                public:
                     using Foo::x;
                     using Foo::blah;
                };


            Caveat:   SWIG does not actually check to see if declarations imported
            via 'using' are in the inheritance hierarchy.  If this occurs, the
            wrapper code won't compile anyways---not sure it's worth worrying about.
          
08/18/2002: beazley
            Modified overloading dispatch to not include nodes with an "error" attribute.
            A language module can set this if a node couldn't be wrapped and you don't want
            it included in the dispatch function.

08/18/2002: beazley
            Enhancement to overloaded function dispatch.   The dispatcher is now aware of
            inheritance relationships.   For example:

                   class Foo { };
                   class Bar : public Foo { };
                    
                   void spam(Foo *f);
                   void spam(Bar *b);

            In this case, the dispatcher re-orders the functions so that spam(Bar *b) is
            checked first---it is more specific than spam(Foo *f).

08/17/2002: beazley
            Added -Werror command line option.   If supplied, warning messages are treated
            as errors and SWIG will return a non-zero exit code.

08/17/2002: beazley
            Fixed [ 596135 ] Typedef of reference can't compile.  For example:

                 typedef int &IntRef;
                 void foo(IntRef i);

            SWIG-1.3.14 generated code that wouldn't compile.

Version 1.3.14 (August 12, 2002)
================================

08/11/2002: mmatus
	    Static const members initialized during declaration, and
	    only them, ie:

	    struct A
	    {		 
		static const int a = 1 ;  // this one
		static const int b;       // not this one
            };     

	    are emitted like constants (equivalent to enums or
	    explicit %constant).
	    
	    This is because they cannot be added directly to 'cvar'
	    since they lack the needed reference (well, you can force
	    them to have a real reference, but in an ugly way which
	    goes completely again the original purpose of initialize
	    them during declaration, you also have to deal with extra
	    linking matters, and it take a while to figure out what is
	    the problem and how to solve it).
	    
	    Please test it with your preferred target language, and
	    not only the code generation, but really run the example
	    in the test-suite (static-const-member-2.i) because the
	    problem and the solution cannot be "fully" appreciated
	    until you try to load the module and run it.

	    In some target languages (python specially), this can
	    produces a difference in the way that the static constant
	    members 'a' and 'b' are internally wrapped. Hopefully,
	    they still can be accessed in the same way.


08/11/2002: mmatus
	    [python] Now static const members can be accessed in a more
	    natural way, ie, if you have

	    struct A
             {		 
		typedef unsigned int viewflags;
		static const viewflags forward_field = 0;
		static const viewflags backward_field;
            };     
	    
	    now you can do:

		print A.backward_field

	    and also

	        a = A()
		print a.forward_field
		
	    Note that if the static const members don't have an
	    initializer (like backward_field), still you can access
	    them in the same way in the python side, but the
	    implementation is a quite different: backward_field will
	    still appear in the cvar entity, and also, you are 
	    responsible to initialize it in some code unit, and link it
	    properly. forward_field, by the other hand, will not
	    appear in the cvar entity but only as a A member, similar
	    to what happen with enum or %constant members.

08/11/2002: mmatus
	    [python] Common code in the __setattr__/__getattr__ now
	    goes to two "free" methods at the beginning of the proxy
	    file, from where each class use it. This change reduces
	    the size of the proxy file, specially if you wrap a lot of
	    small classes in one module (up to 33% in some cases),
	    making it faster to load too.

08/09/2002: beazley
            [Perl5] If a function that returns char * returns NULL,
            undef is returned to the Perl interpreter.
 
08/09/2002: beazley
            Fix to conversion operators and namespaces.  For example:

                namespace ns {
                    struct Foo { };
                    struct Bar {
                        operator Foo*();
                    };
                }

            In the wrapper code, SWIG was using ->operator Foo*()
            when it should have been using ->operator ns::Foo*().

            Note: if using %rename with a conversion operator, you
            might have to do this:

               %rename(toFooPtr) ns::operator ns::Foo*();
                                      //      ^^^^ note extra qualifier
               namespace ns {
                    ...

            
08/09/2002: beazley
            [Python] Minor enhancement to 'const' variable declarations. 
            Normally const declarations are wrapped as read-only variables
            accessible only through the cvar attribute (see SWIG.html for
            a discussion of why).  However, in many programs, "const" 
            declarations may just be constants---making the cvar. access
            awkward.  To fix this, "const" declarations are now available
            both through cvar. and as a simple name.  For example:

                 const int FOO = 42;

            In Python:

                 >>> print example.cvar.FOO
                 42
                 >>> print example.FOO
                 42

            Note: There are cases where the value of a "const" variable
            might change.  For example:

                 char *const BAR = "Hello World";

            In this case, the pointer itself can not change, but the 
            data being pointed to could be modified.  In these situations,
            cvar.BAR should be accessed to obtained the current value.

08/08/2002: beazley
            [Python] Fixed generation of the proxy code (.py files) to more
            closely follow the order of declarations as they appear in
            the .i file.   In the past, all of the class wrappers appeared
            first, followed by function stubs, inserted Python code, and
            other details.

08/08/2002: cheetah (William Fulton)
            [Java] Proxy method _delete() changed to delete(). There shouldn't ever
            be a wrapped function called delete() as it is a C++ keyword and there
            is no such thing as a member function in C.

            *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***

            Backwards compatibility can be achieved by adding the function back in
            for all proxy classes:
            %typemap(javacode) SWIGTYPE %{
              public void _delete() {
                delete();
              }
            %}

            Java backwards compatibility summary
            ------------------------------------

            There are a number of changes that have been made in improving the Java module 
            for ver 1.3.14.  If at all possible change your code to take advantages of the 
            improvements. If you were using proxy classes you may not notice any backwards 
            compatibility issues. Here is an example which will help with most backwards 
            compatibility problems where it is not possible to modify the code that uses
            the generated output:

            Replace:
                %module modulename

            With:
                %module (jniclassname="modulename") modulename;
                %typemap(javacode) SWIGTYPE %{
                    public long getCPtr$javaclassname() {
                        return swigCPtr;
                    }
                    public void _delete() {
                      delete();
                    }
                %}
                %pragma(java) jniclassclassmodifiers="public";

            The proxy constructors that took parameters (long cPtr, boolean cMemoryOwn)
            were public and are now protected. If you were making use of these then you'll 
            have to modify your code and the best solution would be to use the new type 
            wrapper classes.

            The other main areas are the pragmas and global variable wrapping. Replace 
            the pragmas with one of the new directives or typemaps mentioned below and use
            %rename on the variables.

            If you were not using proxy classes, you will have to define a jstype typemap
            as well as a jtype typemap.

08/08/2002: cheetah (William Fulton)
            [Java] Fix for wrapping two dimension array variables.

08/07/2002: beazley
            [Python,Tcl]
            Object management now has a much better sense of ownership.
            Ownership bits is changed whenever an object is stored in a
            global variable or structure member.  For example:

                struct Foo {
                    int val;
                    Foo *next;
                };

            Now in Python

               >>> f = Foo()
               >>> f.thisown
               1
               >>> g = Foo()
               >>> g.next = f          # Assign a pointer
               >>> f.thisown           # Notice ownership change
               0
               >>>

            This scheme is mostly a conservative heuristic designed to 
            provide segmentation faults.  It could cause a memory leak
            if ownership is changed unnecessarily.  In this case, you can
            either write a typemap (that doesn't change ownership), or
            manually set the thisown attribute back to 1.

08/07/2002: beazley
            [Tcl] Major usability improvements to the object interface.
            Suppose you had code like this:

                 struct Foo { 
                     int x;
                     int spam();
                 };

                 void  blah(Foo *f);

            In past versions of SWIG, you could create objects and use
            them like this:

                % Foo f
                % f configure -x 3
                % f spam
                37
    
            The only problem is that if you tried to call blah(), it didn't
            work:

                % blah f
                Type Error. Expected _p_Foo
                %

            Instead, you had to do this:

                % blah [f cget -this]
  
            SWIG now automatically extracts the -this pointer, avoiding this
            problem.  This means that saying "blah f" is perfectly legal and
            everything will still work normally.

            Caveat: Since pointer strings start with a leading underscore (_),
            don't use this in object names.  For example:

                % Foo _f 
                % blah _f        # Potential crash

            Objects now have a -thisown attribute that shows the ownership.
            This builds upon the CHANGES 11/24/2001 entry.

08/07/2002: samjam, Sam Liddicott
            Properly implemented pointer system using php resources.
            Still need to work out whether or not to let script-users call
            destructors directly

08/06/2002: beazley
            Upgraded mzscheme module to support version 201 and added
            overloading support.

08/05/2002: beazley
            Added parsing support for extra grouping (in very limited cases).
            For example:

                    typedef int (FuncPtr)(int, double);

            *** EXPERIMENTAL ***
            
08/03/2002: ljohnson (Lyle Johnson)
            [Ruby] Updates to typemaps.i as those done previously for Perl,
            Python and Tcl modules. Now supports reference types with INPUT,
            OUTPUT and INOUT typemaps.

08/02/2002: beazley
            New library file cstring.i added.  Provides macros for
            manipulating char * data.
 
08/02/2002: beazley
            Deprecated the %new directive.  Use %newobject instead.  For
            example:

               %newobject foo;
               ...
               char *foo();

            %newobject follows the same rules as %rename, %ignore, %feature,
            etc.

            *** POTENTIAL INCOMPATIBILITY ***

08/01/2002: cheetah (William Fulton)
            [Java] New attribute 'jniclassname' for the module directive allows a way of
            changing the JNI class name from the default which uses the modulename with JNI
            appended after it.

                %module (jniclassname="name") modulename

            If 'name' is the same as 'modulename' then the module class name gets changed
            from 'modulename' to modulenameModule.

08/01/2002: beazley
            Fixed problem with file include order.  Language specific
            directories should take precedence over generic directories.
            For example:  "swig_lib/python/foo.i" should be loaded before
            "swig_lib/foo.i".    I thought this was the case already, but
            apparently it has been broken for quite some time.

08/01/2002: beazley
            Added std_deque.i library file.  Work in progress.

08/01/2002: beazley
            [Python,Tcl,Perl]
            Improvements to typemaps.i.  INPUT/INOUT typemaps perform better
            error checking.  Typemaps are now supplied for references like 
            int &OUTPUT, double &INOUT, etc.
          
08/01/2002: beazley
            [Python] Deprecated the T_* and L_* typemaps in typemaps.i.
            Multiple return values are always placed in a tuple. Deprecated
            the BOTH typemaps.  This is now INOUT (e.g., int *INOUT).

            *** POTENTIAL INCOMPATIBILITY FOR PYTHON MODULE ***

08/01/2002: beazley
            Deprecated the array.i, carray.i, and timer.i library files.

08/01/2002: beazley
            Deprecated the pointer.i library file.  Use cpointer.i instead.
            *** POTENTIAL INCOMPATIBILITY ***
            
08/01/2002: cheetah (William Fulton)
            [Java] For consistency the global variable getters and setters use the JavaBean 
            property design pattern like member variables always have. This means if you are 
            wrapping a variable called foo, the getter is called getFoo() and the setter is 
            called setFoo(). Before the recent changes to the Java module the getters and 
            setters were called get_foo() and set_foo(). If you really want the original 
            function names use the %rename directive like this: %rename(_foo) Foo;

07/31/2002: beazley
            Fixed casting problem with multiple inheritance.  If you had this,

                  class foo {};
                  class bar : public foo {};
                  class baz : public foo {};
                  class spam : public bar, public baz {};

            then the wrappers wouldn't compile due to an ambiguous cast.
            Reported by Art Yerkes.

07/30/2002: cheetah (William Fulton)
            [Java] Due to new static typechecking all pointers held in a Java long are part of 
            the internal workings and this pointer value in the Java long has become abstracted
            data. The type wrapper constructor and getCPtr() methods are as such protected.
            If you need to mess around with pointers from Java or for example create a proxy 
            class or type wrapper class around a null pointer, add a function/constructor 
            to do so with the %javacode typemap. You can also make getCPtr() public again with
            the %javagetcptr typemap.

07/30/2002: cheetah (William Fulton)
            [Java] Fixes for %typemap(ignore). In particular when ignoring the last parameter
            in a function. Also for all parameters in constructors. These mods have also fixed
            multi-argument typemaps for proxy classes - SF 581791.

07/30/2002: cheetah (William Fulton)
            [Java] %newobject (replacement for %new) now implemented for Java. 

07/29/2002: beazley
            Fixed problem with typemap copies, %apply, and %clear inside
            C++ namespaces.

07/28/2002: cheetah (William Fulton)
            [Java] The JNI class now has package access as the class modifier
            has been changed from "public" to nothing. This has been done
            as this class is now more for the internal workings of SWIG since the module
            class has static type checking for all types.

            *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***

            Backwards compatibility can be achieved by using the %jniclassclassmodifier 
            pragma to change it back to "public".

07/28/2002: cheetah (William Fulton)
            [Java] Proxy/Shadow classes are generated by default. The -proxy and 
            -shadow command line options are deprecated. If you want to use the 
            low-level functional interface then use the new -noproxy commandline option.

            *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***

07/28/2002: cheetah (William Fulton)
            [Java] Remaining pragmas shakeup. These were the remaining pragmas and their
            new names where changed:

            modulebase
            modulecode
            moduleclassmodifiers
            moduleimport => moduleimports
            moduleinterface => moduleinterfaces

            The moduleimports works slightly differently to how the moduleimport pragma worked. 
            Now it actually takes code which gets placed before the class definition so the 
            whole import statement has to be given, for example:

            %pragma(java) moduleimports=%{
            import java.io.*;
            import java.math.*;
            %}

            The moduleinterfaces is slightly different to the old moduleinterface in that if 
            more than one interface is required they must be comma separated in one use of 
            the pragma, for example:

            %pragma(java) moduleinterfaces="Serializable, MyInterface"

            These last two pragmas are consistent with the javainterfaces and javaimports 
            typemap.

            A similar set of pragmas has been introduced, namely:

            jniclassbase
            jniclasscode
            jniclassclassmodifiers
            jniclassimport
            jniclassinterface

            These work in the same way as their module counterparts. Note that previously
            the moduleXXX pragmas worked on the old module class which is now called the
            JNI class (the class with the native functions). The jniclassXXX pragmas now 
            work on the new module class (the class that has all the global functions and
            global variable getters and setters when using proxy classes, plus all other
            remaining functions when using the low-level procedural interface).

            In summary the contents of the pragmas make up a class like this:

            <jniclassimports>
            <jniclassmodifiers> class modulename extends <jniclassbase> implements <jniclassinterfaces> {
                <jniclasscode>
                ... SWIG generated functions ...
            }
}
            *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***

07/28/2002: cheetah (William Fulton)
            [Java] Deprecated modulemethodmodifiers pragma and replaced with 
            a better %feature based directive called %javamethodmodifiers.
            A useful example would be for synchronisation in multi-threaded apps:

            %javamethodmodifiers foo(int a) "public synchronized";

            Changes this function from the default ("public") to "public synchronized".

            *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***

07/26/2002: beazley
            Several directives now allow optional configuration parameters.
            These include:

                %module(name="value", name="value", ...) modulename
                %import(name="value", ...) "filename.i"
                %extend(name="value", ...) classname {
                   ...
                }

            These currently have no effect and are reserved for
            future expansion.
               
07/26/2002: beazley
            Enhancements to smart-pointer handling.  SWIG only provides
            extra support for a smart-pointer if operator->() returns
            a proper pointer.  For example:

                 Foo *operator->();

            If operator->() returns an object by value or reference,
            then SWIG examines the returned object to see if it also
            implements operator->().  If so, SWIG chases operator->()
            until it can find one that returns a pointer.  This allows
            cases like this to work:

                 class Foo {
                 public:
                     void blah();
                 };

                 class Bar {
                   ...
                   Foo *operator->();
                   ...
                 };

                 class Spam {
                   ...
                   Bar operator->();
                   ...
                 };

            For example:

                 >>> s = Spam()
                 >>> s.blah()      # Invokes Foo::blah()

            The s.blah() call actually invokes:

                  ((s.operator->()).operator->())->blah();
 
07/26/2002: beazley
            Fixed a bug with typedef and references.  For example:

                 typedef Foo & FooRef;
                 FooRef blah();

            Previous versions of SWIG generated code that wouldn't
            compile.

07/25/2002: beazley
            Wrapping of static methods has been improved in proxy classes.  In older
            versions of SWIG, if you had this:

                  class Foo {
                  public:
                     static void bar();
                  };

            The static method was only available as a function Foo_bar().  For example:

                  >>> Foo_bar()

            Now, the static method can also be invoked through an instance like this:

                  >>> f = Foo()
                  >>> f.bar()        # Invokes static method

            This works with all versions of Python.  Additionally, for Python-2.2,
            the static method can be invoked as:

                  >>> Foo.bar()

            The old-style function is still support for backwards compatibility. If
            you care about making your code across different versions of Python,
            either use Foo_bar() or access the method through an instance.
 
07/25/2002: beazley
            Changes to the Python module.  Proxy classes now utilize new Python-2.2
            features including properties and static methods.  However, these features
            are supported in a way that provides backwards compatibility with older
            Python versions.  In other words, proxy classes work with all versions
            of Python and only use new features when running on Python-2.2.


07/25/2002: beazley
            Modified %extend so that overloaded methods can be added.  For example:

                %extend Foo {
                     void bar(int x) { };
                     void bar(char *s) { };
                     ...
                }

            This works with both C++ *and* C.

07/24/2002: cheetah (William Fulton)
            [Java] More new typemaps so that the Java proxy classes and type wrapper classes
            can be further tailored by users. These are the default code for generating the 
            finalize() methods (proxy classes only) and the getCPtr() methods for proxy 
            classes and type wrapper classes:

            %typemap(javafinalize) SWIGTYPE %{
              protected void finalize() {
                _delete();
              }
            %}
            
            %typemap(javagetcptr) SWIGTYPE, SWIGTYPE *, SWIGTYPE &, SWIGTYPE [] %{
              public static long getCPtr($javaclassname obj) {
                return obj.swigCPtr;
              }
            %}

            The javagetcptr typemap will enable users to handle Java null by overriding
            this typemap - a requested feature.

            The -nofinalize commandline option has been deprecated. The javafinalize
            typemap is more powerful as it will allow the removal of the finalize methods 
            for all or any one or more particular proxy class.

07/23/2002: cheetah (William Fulton)
            [Java] The getCPtrXXX() function has been changed to a static function and
            is now of the form:

            protected static long getCPtr(XXX obj) {...}

            This is a requested change which will allow Java null pointers to be used as null
            can be passed in for obj. However, to achieve this the appropriate code must be
            written using the new javagetcptr typemap directive.

            *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***

            Backwards compatibility can be achieved by adding this function back in using the
            new javacode typemap:

            %typemap(javacode) SWIGTYPE %{

              // SWIG-1.3.12 and SWIG-1.3.13
              public long getCPtr$javaclassname() {
                return swigCPtr;
              }
              // SWIG-1.3.11 and earlier
              public long getCPtr() {
                return swigCPtr;
              }

            %}


07/23/2002: cheetah (William Fulton)
            [Java] New directive to control constant code generation - %javaconst.
            The default handling for handling constants is to get the value through
            a JNI call, eg

            #define YELLOW 5
            #define BIG 1234LL

            results in:

            public final static int YELLOW = modulename.get_YELLOW();
            public final static long BIG = modulename.get_BIG();

            Earlier versions of the Java module initialised the value using the C value:

            public final static int YELLOW = 5;
            public final static long BIG = 1234LL;

            This works in most cases, but the value for BIG won't compile as 1234LL is not
            valid Java code and this is one of the reasons why the default is now to get the 
            values through a JNI call. The side effect is that these 'constants' cannot be used 
            in switch statements. The %javaconst directive allows one to specify the
            way the constant value is initialised and works like other %feature
            directives, eg

            %javaconst(0);     // all constants from this point on are initialised using the C value
            %javaconst(1) BIG; // just BIG initialised using JNI call (must be parsed before BIG is defined)

07/23/2002: beazley
            *** IMPORTANT CHANGES TO THE PYTHON MODULE ***

            (1) The Python module now enables shadow/proxy classes by default.
            This means that two files are always created by SWIG.  For
            instance, if you have this:

                 // file: foo.i
                 %module foo
                 ...

            Then swig generates two files "foo_wrap.c" and "foo.py".

            (2) The name of the low-level C extension module has been changed
            to start with a leading underscore.   This means that you have
            to compile the module as follows:

                $ cc -c -I/usr/local/include/python2.2 foo_wrap.c
                $ cc -shared foo_wrap.o $(OBJS) -o _foo.so
                                                   ^^^^
                                                   note extra underscore

            This naming scheme is consistent with other Python modules that
            utilize extension code.  For instance, the socket module consists
            of "_socket.so" and "socket.py".  In previous versions of SWIG,
            the shared object file was named "foocmodule.so".

            (3) A new directive can be used to insert Python code into
            the corresponding .py file.  For example:

                %pythoncode %{
                def foo():
                    print "Hello World"
                %}

             This directive allows you to create modules as a mix of C and Python.
             Python code is seamlessly added to the module.

            (4) The -shadow command line option is deprecated.  This is turned on
            by default.

            (5) To disable the generation of the extra python file, use the "-noproxy"
            command line option.

            *** POTENTIAL INCOMPATIBILITY ***
            This change will likely break the build environment of projects that
            utilize shadow classes.   To fix this, you probably only need to
            change the name of the target .so file.  For example, if you have
            Makefile information like this:

                   TARGET = examplecmodule.so

            Just change it to:

                   TARGET = _example.so

            *** DOCUMENTATION UPDATE ***
            The file Doc/Manual/Python.html has been updated to describe these changes.


07/23/2002: beazley
            Added -noextern option.   If supplied, SWIG will not generate
            extra extern declarations.  This is sometimes an issue on 
            non-unix platforms.

07/23/2002: beazley
            Added a warning for ignored friend functions.

07/23/2002: beazley
            Fixed [ 574498 ] -proxy and %include "pointer.i" clash.
            Reported by David Creasy.

07/23/2002: beazley
            Fixed [ 576103 ] global destruction warning with shadow.
            Perl extensions should no longer report the warning

               "Use of uninitialized value during global destruction."
 
            when running with "perl -w".  Reported by
            Brett Williams.

07/23/2002: beazley
            In C++ mode, SWIG now always defines namespace std.  By default,
            it's empty.  However, this will silence errors from programs
            that include statements such as "using namespace std;".
            This fixes Bug [ 584017 ] using namespace std generates error.
            Reported by Joseph Winston.

07/22/2002: beazley
            Added a new warning message for %apply.  If you use %apply but no typemaps
            are defined, you will get a warning message.  This should help with
            problems like this:

                   %apply char *OUTPUT { ... };

            In old versions of SWIG, this silently did nothing.  Now you get an error like this:
  
                   file:line. Warning. Can't apply (char *OUTPUT). No typemaps are defined.

07/22/2002: cheetah (William Fulton)
            [Java] Started Java pragma deprecation. Replacements use %typemap based 
            directives and enable proxy classes and the new type wrapper classes to be 
            tailored in various ways. These are the new typemaps:
            
            %typemap(javabase)           - base (extends) for Java class
            %typemap(javaclassmodifiers) - class modifiers for the Java class: default is "public"
            %typemap(javacode)           - java code is copied verbatim to the Java class
            %typemap(javaimports)        - import statements for Java class
            %typemap(javainterfaces)     - interfaces (extends) for Java class
            
            And these are the %pragma directives being deprecated:
            allshadowbase
            allshadowclassmodifiers
            allshadowcode
            allshadowimport
            allshadowinterface
            shadowbase
            shadowclassmodifiers
            shadowcode
            shadowimport
            shadowinterface
            
            Note that it is possible to target a particular proxy class:
            %typemap(javaimports) Foo "import java.util.*";
            or a particular type wrapper class:
            %typemap(javaimports) double* "import java.math.*";
            Note that $javaclassname in these typemaps are substituted with either the proxy 
            classname when using proxy classes or the SWIGTYPE class name.

07/18/2002: cheetah (William Fulton)
            [Java] Java module overhaul to implement static type checking of all 
            types. 
            
            1) Changes when using Java Proxy classes
            ----------------------------------------

            Previously when wrapping global functions: 

            class SomeClass{};
            void foo(SomeClass* s);
            SomeClass* bar();

            The native method prototypes used a long for pointers and looked like this:

            public class modulename  {
                ...
                public final static native void foo(long jarg1);
                public final static native long bar();
            }

            and unlike member functions of a C++ class there was no wrapper around the native calls 
            to make the use of them more user friendly. They would be used from Java like this:

            SomeClass s = new SomeClass(modulename.bar(), false);
            modulename.foo(s.getCPtrSomeClass());

            Note that the following will have the same effect, but then it would not have 
            been possible to call any proxy member functions in SomeClass:

            long s = modulename.bar();
            modulename.foo(s);

            Now wrapper functions are generated:

            public class modulename  {
                public static void foo(SomeClass s) {
                    // calls the native function
                }

                public static SomeClass bar() {
                    // calls the native function
                }
            }

            Which means these functions can now be used more naturally with proxy classes:

            SomeClass s = modulename.bar();
            modulename.foo(s);

            2) Changes when not using Java Proxy classes
            --------------------------------------------

            The so called low-level interface was rather low-level indeed. The 
            new static type checking implementation makes it less so but it remains a
            functional interface to the C/C++ world. Proxy classes are the obvious way to use
            SWIG generated code, but for those who want a functional interface all non-primitive
            types now have a simple Java class wrapper around the C/C++ type. Pointers and
            references to primitive types are also wrapped by type wrapper classes. The type
            wrapper classnames are based on the SWIG descriptors used by the other language 
            modules. For example:

            C/C++ type      Java type wrapper class name
            ----------      ----------------------------
            int*            SWIGTYPE_p_int
            double**        SWIGTYPE_p_p_double
            SomeClass*      SWIGTYPE_p_SomeClass
            SomeClass&      SWIGTYPE_p_SomeClass
            SomeClass       SWIGTYPE_p_SomeClass

            Note that everything wrapped by SWIG is accessed via a pointer even when wrapping 
            functions that pass by value or reference. So the previous example would now be 
            used like this:

            SWIGTYPE_p_SomeClass s = example.bar();
            example.foo(s);

            Note that typedefs that SWIG knows about are resolved, so that if one has 

            class Foo{};
            typedef Foo Bar;

            then any use of Bar will require one to use SWIGTYPE_p_Foo;

            Some considerations:
            Make sure you make a firm decision to use either proxy classes or the functional 
            interface early on as the classnames are different.

            3) Pointers and non-parsed types
            --------------------------------
            Sometimes SWIG cannot generate a proxy class. This occurs when the definition of 
            a type is not parsed by SWIG, but is then used as a variable or a parameter. 
            For example,

            void foo(Snazzy sds);

            If SWIG has not parsed Snazzy it handles it simply as a pointer to a Snazzy.
            The Java module gives it a type wrapper class around the pointer and calls it 
            SWIGTYPE_p_Snazzy. In other words it handles it in the same manner as types are 
            handled in the low-level functional interface. This approach is used for all 
            non-proxy classes, eg all pointer to pointers and pointers to primitive types.

            4) Backwards compatibility
            -----------------------
            Backwards compatibility is not an issue if you have been using proxy classes and 
            no global variables/functions. Otherwise some changes will have to be made. 
            The native methods still exist but they are now in a JNI class, which is called 
            modulenameJNI. As this class is really part of the internal workings,
            it should not be required so the class has become protected. Some pragmas/directives
            will hopefully be added to help with backwards compatibility.

            *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***

07/18/2002: beazley
            Modified wrapping of uninstantiated templates returned by
            value.  Just to be safe, they are now wrapped by SwigValueWrapper<>
            just in case they don't define a default constructor.  This
            would be used if you had code like this

                 Foo<int> blah();
                 void     moreblah(Foo<int> x);

            but you didn't instantiate Foo<int> using %template.  
            We should probably add a warning for this.

07/17/2002: beazley
            Added an error check to detect shadowed template paramaters.
            For example:

                  template<class T> class Foo {
                  public:
                        int T;
                  };

            This results in an error, not a warning.  This warning is
            also needed to fix some rather insidious problems like
            this:

                 struct T {
                      int  blah;
                 };

                 template<class T> class Foo {
                 public:
                      typedef T Traits;    // Which T is this????
                 };

            In this case, the template parameter T shadows the outer
            structure (which is what you want).

07/16/2002: beazley
            Improved support for templates with integer arguments.  SWIG is
            much more aware of situations such as this:

                const int Size = 100;

                %template(Foo100) Foo<100>;
                void bar(Foo<Size> *x);   // Knows that Foo<Size> is the same as Foo<100>;

07/15/2002: beazley
            Fixed bug with %feature/%ignore/%rename and namespaces.
            For example:

                %ignore Foo::Bar
                namespace Foo {
                     class Bar {
                     ...
                     };
                }

            Reported by Marcelo Matus.

07/09/2002: beazley
            Added parsing support for constructors that try to catch
            exceptions in initializers.   For example:

              class Foo {
                 Bar b;
              public:
                 Foo(int x) try 
                     : b(x) { ... }
                 catch(int) {
                     ...
                 }
              }

            This has no effect on the generated wrappers.  However, the try and catch
            parts of the declaration are ignored.  See Stroustrup, 3rd Ed, section 
            14.4.6.1 for details.
                   
07/06/2002: beazley
            Fixed bug in template symbol table management.  This fixes
            two bugs.  First, mixing abstract methods, templates, and 
            inheritance no longer generates a failed assertion.
 
                template <class T>
                class A {
                public:
                   virtual void foo() = 0;
                };
 
               template <class T>
               class B : public A<T>
               {
               };
               %template(A_int) A<int>;
               %template(B_int) B<int>;

            This fix also fixes a subtle problem with default values and
            templates.  For example:

               template <class C>
               struct B {
                   typedef unsigned int size_type;
                   static const size_type nindex = static_cast<size_type>(-1);
                   void foo(size_type index = nindex);
               };

            Bugs reported by Marcelo Matus.


07/05/2002: ljohnson (Lyle Johnson)
            [Ruby] Changed the definition of the SWIG_ConvertPtr() function
	    for the SWIG/Ruby runtime support so that it looks like the
	    Python version. If the last argument (flags) is non-zero,
	    SWIG_ConvertPtr() will raise an exception for type mismatches
	    as before. If flags is zero, this function will return -1 for
	    type mismatches without raising an exception. 

            *** POTENTIAL INCOMPATIBILITY FOR RUBY MODULE ***

07/04/2002: beazley
            Overloaded functions/methods/constructors now work in many language
            modules.  The support is completely transparent--just call the
            function normally and SWIG will dispatch to the correct implementation.
            There are a variety of issues associated with this.  Please refer
            to the overloading section of Doc/Manual/SWIGPlus.html for details.
            *** NEW FEATURE ***
            
07/04/2002: beazley
            Fixed a bug with namespaces, enums, and templates.  For example:

               namespace hello {
                  enum Hello { Hi, Hola };
 
                  template <Hello H>
                      struct traits
                      {
                          typedef double value_type;
                      };
 
                 traits<Hi>::value_type say_hi()
                 {
                    return traits<Hi>::value_type(1);
                 }
               }
            SWIG wasn't generating wrappers that properly qualified 
            traits<Hi>.  Reported by Marcelo Matus.         

06/30/2002: beazley
            Supplied array variable typemaps for Tcl module.   If you have a
            variable like this:

                int foo[10];

            then a set function like this is generated:

                void foo_set(int *x) {
                   memmove(foo,x,10*sizeof(int));
                }

06/30/2002: beazley
            New %fragment directive.   When writing typemaps, it can be easy to
            get carried away and write a lot of code.  However, doing so causes
            tremendous code bloat.   A common way to solve this is to write 
            helper functions.  For example:

                %{
                void some_helper_function() {
                     ...
                }
                %}

                %typemap(in) type {
                   some_helper_function(...);
                }

            The only problem with this is that the wrapper file gets polluted
            with helper functions even if they aren't used.    To fix this,
            a new fragment directive is available.  For example:

               %fragment("type_helper","header") %{
                  void some_helper_function() {
                      ...
                  }
               %}

               %typemap(in, fragment="type_header") type {
                   some_helper_function(...);
               }

            In this case, the code fragment is only emitted if the typemap is
            actually used.   A similar capability is provided for declaration
            annotation and the %feature directive.  For example:

               %feature("fragment","type_header")  SomeDeclaration;

            The first argument to %fragment is the fragment name.  The second argument
            is the file section where the fragment should be emitted.  

            The primary use of this directive is for writers of language modules
            and advanced users wanting to streamline typemap code.

            *** EXPERIMENTAL NEW FEATURE ***

06/30/2002: beazley
            Supplied memberin typemaps for all arrays in an attempt to eliminate
            confusion about their use.

06/29/2002: beazley
            Experimental support for smart-pointers.  When a class defines
            operator->() like this

               class Foo {
                  ...
                  Bar *operator->();
                  ...
               };

            SWIG locates class Bar and tries to wrap its member variables and
            methods as part of Foo.  For example, if Bar was defined like this:

               class Bar {
               public:
                    int x;
                    int spam();
               };

            You could do this (in the target language):

              f = Foo()
              f.x = 4            # Accesses Bar::x
              f.spam()           # Accesses Bar::spam

            The primary use of this feature is to emulate the behavior of C++
            smart-pointers---which allow attributes to accessed transparently
            through operator->.

            This feature is supported automatically in SWIG---no special directives
            are needed.   To disable this behavior.  Use %ignore to ignore 
            operator->.
            *** NEW FEATURE ***

06/26/2002: beazley
            Deprecated the %except directive.   %exception should be used instead.

06/25/2002: beazley
            Major cleanup of the modules directory.  Eliminated most
            header files, consolidated module code into single files.

06/24/2002: beazley
            Reworked the instantiation of language modules.  All language
            modules must now define a factory function similar to this:

                extern "C" Language *
                swig_python(void) {
                   return new PYTHON();
                }

            This function is then placed in a table and associated with
            a command line option in swigmain.cxx.  

            This approach has a number of benefits.  It decouples the 
            SWIG main program from having to know about the class
            definitions for each module.  Also, by using a factory
            function, it will be easier to implement dynamic loading
            of modules (simply load the file and invoke the factory
            function).

06/24/2002: beazley
            Fixed syntax error for reference conversions.  For example:

                     operator Foo &();

06/24/2002: beazley
            Fixed syntax error for operator new[] and operator delete[].

06/24/2002: beazley
            Fixed code generation problem for constants and default arguments
            involving templates.

06/19/2002: ljohnson (Lyle Johnson)
            [Ruby] Fixed a bug for the '-feature' command line argument;
            that setting was effectively being ignored and so the feature
            name was always set equal to the module name.

06/17/2002: beazley
            Fixed problems with static members and enums in templates.

Version 1.3.13 (June 17, 2002)
==============================
06/16/2002: beazley
            Fixed a bug with __FILE__ expansion in the preprocessor.   On Windows,
            the backslash (\) is now converted to (\\) in the string literal
            used for __FILE__.  Reported by Steve Glaser.

06/14/2002: beazley
            Fixed warning message about 'name private in this context'.  The
            warning is only generated for public methods.  Reported by
            Scott Michel.
 
06/14/2002: beazley
            Fixed some problems related to template instantiation 
            and namespaces.   When SWIG expands a template, it does
            so with fully resolved types.  For example, if you have this:

                template<class T> class foo { };
                typedef double Double;
                %template(foo_d) foo<Double>;

            then, it is handled as foo<double> in the typesystem.
            This fixes a number of subtle problems with inheritance
            and templates.

06/14/2002: ljohnson (Lyle Johnson)
            [Ruby] Added missing bool typemaps for INPUT, OUTPUT and
	    INOUT in Lib/ruby/typemaps.i.

05/29/2002: cheetah (William Fulton)
            [Java] Fix for a couple of broken pragmas.

05/29/2002: cheetah (William Fulton)
            Fix for unnecessary cast when wrapping global variable where 
            the type is not parsed by SWIG - Java variables example 
            failure as reported by Larry Virden.

06/10/2002: beazley
            Modified %template to allow for empty instantiations.

                  %template() foo<int,int>;

            This registers foo<int,int> with the type system, but
            doesn't wrap it (same as %ignore).   This may only be a
            temporary measure.   SWIG might be able to automatically
            instantiate templates in certain cases.

06/10/2002: beazley
            Fixed function prototype problems with Tcl 8.4

06/09/2002: beazley
            Fixed problem with templates and location of base classes.  
            This one is a little mind-bending, but here is an example
            that illustrates:
 
             template <class ArgType, class ResType>
             struct traits
             {
                  typedef ArgType arg_type;
                  typedef ResType res_type;
             };
 
             template <class ArgType, class ResType>
             struct Function
             {
             };
 
             template <class AF, class AG>
             struct Class : Function<typename traits<AF, AG>::arg_type,
                                     typename traits<AF, AG>::res_type>
             {
             };

             %template(traits_dd) traits <double, double>;
             %template(Function_dd) Function <double, double>;
             %template(Class_dd) Class <double, double>;


            In this example, the base class of 'Class' is determined from
            the Function template, but the types are obtained through typedefs.
            Because of this, SWIG could not locate the wrapped base class
            (Function<double,double>).   Should be fixed in 1.3.13 even
            though I can think of a million other things that might
            also be broken.

06/07/2002: beazley
            Fixed a problem with conversion operators.  If you had an
            operator like this,

                  operator double() const;

            SWIG was ommitting the "const" qualifier.  This affected
            %rename and other directives.  Reported by Zhong Ren.

06/07/2002: beazley
            Lessened the strictness of abstract class checking.  If
            you have code like this:

                class Foo {
                public:
                   virtual int method() = 0;
                };

                class Bar : public Foo {
                public:
                    Bar();
                   ~Bar();
                };

             SWIG will go ahead and generate constructor/destructors
             for Bar.  However, it will also generate a warning message 
             that "Bar" might be abstract (since method() isn't defined).
             In SWIG-1.3.12, SWIG refused to generate a constructor at all.

06/07/2002: beazley
            Change to %template directive.  If you specify something like this:

                %template(vi) std::vector<int>;

            It is *exactly* the same as this:
 
                namespace std {
                    %template(vi) vector<int>;
                }

            SWIG-1.3.12 tried to instantiate the template outside of the namespace
            using some trick.  However, this was extremely problematic and full
            holes.   This version is safer.

06/07/2002: beazley
            Fixed bug with scope qualification and templates.  For example:

                 A<B::C>::DD

            Before, this was separated as scopes A<B, C>, and DD.  Fixed now.

06/06/2002: beazley
            Allow the following syntax: 
               
               class A { };
               struct B : A { ... };

            A base class without a specifier is assumed to be public for a struct.
 
06/06/2002: beazley
            Fixed syntax error with template constructor initializers.
            Reported by Marcelo Matus.

06/06/2002: beazley
            Fixed bug with default template arguments. 
            Reported by Marcelo Matus.

06/05/2002: beazley
            Fixed subtle problems with %rename directive and template
            expansion.

            Code like this should now work:

               %rename(blah) foo<double>::method;
               ...
               template<class T> class foo {
               public:
                   void method();
               };

               %template(whatever) foo<double>;

06/05/2002: beazley
            Resolved some tricky issues of multi-pass compilation and 
            and inheritance.  The following situation now generates
            an error:

                  class Foo : public Bar {
                  ...
                  };

                  class Bar {
                  ...
                  };

            The following code generates a warning about incomplete classes.

                  class Bar;
                  class Foo : public Bar { };

            The following code generates a warning about an undefined class.

                  class Foo : public Bar { };  // Bar undefined

            This fixes a failed assertion bug reported by Jason Stewart.

06/05/2002: ljohnson
            [Ruby] Added a warning message for the Ruby module about the lack
            of support for multiple inheritance. Only the first base class
            listed is used and the others are ignored. (Reported by Craig
            Files).
            
06/03/2002: beazley
            Fixed a bug with struct declarations and typedef. For example:

                 typedef struct Foo Foo;
                 struct Foo {
                    ...
                 };

            A few other subtle struct related typing problems were
            also resolved.

Version 1.3.12 (June 2, 2002)
=============================
            
05/30/2002: beazley
            Fixed problem related to forward template class declarations and
            namespaces.  Bug reported by Marcelo Matus.

05/30/2002: beazley
            Added 'make uninstall' target.  Contributed by Joel Reed.

05/29/2002: beazley
            Fixed rather insidious bug with %rename, %feature and template specialization.
            For example:

                %exception vector::__getitem__ {
                     ... some exception ...
                }

                template<class T> class vector {
                    ...
                    T __getitem__(int index);       // Fine
                    ...
                };

                template<> class vector<int> {
                    ...
                    T __getitem__(int index);       // Oops.
                    ...
                };

            Now, the %exception directive (and other features) should correctly apply to
            both vector and specializations.

05/29/2002: beazley
            Subtle changes to %template() directive.   Template arguments are now
            reduced to primitive types in template matching.  For example:

               template<class T> class vector<T *> {
                ... partial specialization ...
               }

               typedef int *IntPtr;     // Gross typedef

               // Gets the above partial specialization
               %template(vectorIntPtr) vector<IntPtr>;

            This change is extremely subtle, but it fixes a number of potential
            holes in Luigi's STL library modules.    For example:

                typedef int Integer;
                %template(vectori) vector<int>;

05/29/2002: beazley
            Fixed rather insidious typemap bug related to const.  const
            was being discarded through typedefs.

05/29/2002: ljohnson (Lyle Johnson)
            [Ruby] Added input typemaps for const references to primitive
            types (in Lib/ruby/ruby.swg).

05/29/2002: cheetah (William Fulton)
            [Java] The java arrray support functions are enclosed by 
            a SWIG_NOARRAYS #define. Useful if not using arrays and 
            it is desirable to minimise the amount of compiled code.

05/29/2002: cheetah (William Fulton)
            [Java] Enums were not renamed when using %name or %rename
            fix.

05/28/2002: ljohnson
            [Ruby] Modified the name of the wrapper functions for the
	    "new" singleton method and "initialize" instance method for
	    consistency with the other language modules. The wrapper name
	    for the function that implements "new" is alloc_classname and
	    the wrapper name for the function that implements "initialize"
	    is new_classname.


05/27/2002: beazley
            Changes to runtime.  Pointer conversion/creation functions
            now almost always have an extra "flags" argument.  For
            example:

              SWIG_ConvertPtr(obj, void **, swig_type_info *ty, int flags);
                                                                ^^^^^^^^^^
            This extra parameter is reserved for future expansion and will
            be used for more control over pointers in future versions.

05/27/2002: beazley
            Fix for C++ classes with private assignment operators.  It
            is now possible to safely return objects like this by value.
            Caveat:  the class must provide a copy constructor.
	    
05/26/2002: beazley
            -proxy option added to many language modules.  This is the
            same as -shadow.  We are merely changing terminology.
            
05/26/2002: beazley
            [perl] Fixed some inconsistencies in the -package option.
            -package merely sets the package name to be used on the
            wrappers.  It does not change the name of the shared library
            file or the name of the generated .pm file.  This was
            broken at some point, but works again now.

05/25/2002: beazley
            [perl] Fixed [ 475452 ] memory leak in return-by-value.
            Problem related to static member variables returning newly
            allocated objects. Reported by Roy Lecates.
 
05/25/2002: beazley
            [perl] Fixed [ 513134 ] %BLESSEDMEMBERS isn't always right.
            Reported by Fleur Diana Dragan.

05/25/2002: beazley
            Fixed [ 540735 ] -importall and the -I option.

05/25/2002: beazley
            [guile] Fixed [ 532723 ] Default arg for char* can SegV.  
            Error in guile module.  Reported by Brett Williams.

05/25/2002: beazley
            Subtle change to typemap application code.  The "freearg"
            typemap must exactly match up with the "in" or "ignore"
            typemap.  For example:

                 %typemap(in) (char *data, int len) { ... };
                 %typemap(freearg) char *data { ... }; 

                 void foo(char *data, int len);

             In this case, the "in" typemap is applied, but the
             freearg typemap is not.  This is because the freearg
             typemap doesn't match up with the input argument sequence.

05/25/2002: beazley
            Fixed [ 548272 ] Default argument code missing braces.
            Reported by Brett Williams.

05/25/2002: beazley
            Fixed [ 547730 ] SwigValueWrapper needed for constructors.
            Reported by William Fulton.

05/25/2002: beazley
            Undefined identifiers now evaluate to 0 when evaluating
            preprocessor expressions.  For example:

                  #if !FOO
                  ...
                  #endif
      
            where FOO is undefined or set to some non-numeric value.

            Fixes [ 540868 ] #if defined whatever - not parsed.
            Reported by Adam Hupp.

 
05/24/2002: beazley
            SWIG now ignores the C++ 'export' keyword.

05/23/2002: beazley
            Some refinement of type-name mangling to account for pointers, arrays,
            references, and other embedded type constructs.

05/23/2002: beazley
            Initial attempt at supporting template partial specialization.  At
            the very least, it is parsed and the classes are stored.  Matching
            of instantiations to specialized version is more limited and based on
            the SWIG default typemap rules:

                     SWIGTYPE *
                     SWIGTYPE []
                     SWIGTYPE &

            Now, why in the world would you want to use this feature?  Other
            than allowing for slightly modified class APIs, this capability is
            primarily used to provide advanced wrapping support for STL-like
            objects.  It can also be mixed with typemaps.  Here is an example:


                /* Generic version */
                template<class T> class vector {
                    %typemap(in) vector<T> * {
                        // A container of objects 
                    }
                };
                /* Partial specialization (pointers) */
                template<class T> class vector<T *> {
                    %typemap(in) vector<T> * {
                        // A container of pointers to objects.
                    }
                };
                /* Specialization (integers). */
                template<> class vector<int> {
                    %typemap(in) vector<int> * {
                        // A container of integers.
                    }
                };

             *** EXPERIMENTAL FEATURE ***
            
05/23/2002: beazley
            Enhancement to typemaps.   Normally, typemap variables are
            renamed to avoid conflicts.  For example:

               %typemap(in) int * (int temp) {
                    $1 = &temp;
               }

            This results in code that creates and uses variables "temp1","temp2", 
            "temp3" and so forth depending on how many times the typemap is used.
            Sometimes you want a single variable instead.  To do that, using
            the following naming scheme:

                %typemap(in) int *(int _global_temp) {
                }
 
            Is this case, a single variable _global_temp is emitted in the
            wrapper functions.  It is shared across all typemaps.  Repeated
            typemaps do not replicate the variable---they use the first one
            emitted.
            *** NEW FEATURE ***
           
05/23/2002: beazley
            Minor enhancement to typemaps.  If you have this code,

               %typemap(in) Foo (int somevar = 3) {
                     ...
               }

            the default value for somevar is now emitted into the wrapper code.

05/22/2002: beazley
            Fixed %extend to be better behaved in namespaces.  If you have code
            like this:

                namespace foo {
                     struct bar {
                        %extend {
                             void blah();
                        };
                     };
                }
  
            SWIG matches the blah() method to a C function named 
            void foo_bar_blah(foo::bar *self).

            This is consistent with the non-namespace version.
            Bug reported by Marcelo Matus.

05/22/2002: beazley
            New library files: cpointer.i, carrays.i, cmalloc.i.  These
            provide access to C pointers and memory allocation functions.
            See Doc/Manual/Library.html for details.

05/22/2002: cheetah (William Fulton)
            [Java] C type char no longer maps to Java type byte, but to Java type char.
            It is now treated as a character rather than a signed number. This fits in
            with the other language modules and is a more natural mapping as char* is 
            mapped as a string of characters. Note that the C signed char type is still
            mapped to a Java byte.

            *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***

05/22/2002: cheetah (William Fulton)
            [Java] Improved constants wrapping. Constants (#define and %constant) values 
            are now obtained through a JNI call. Previously the value was compiled as 
            Java code, but this didn't work for all cases, eg #define 123ULL.

05/22/2002: beazley
            Fixed bogus error message with %extend directive and C++
            access specifiers.  Reported by Marcelo Matus.

05/22/2002: beazley
            Namespaces and enums now work correctly.  For example:

                namespace Foo {
                    enum Bar { A, B };
                }

            Bug reported by Marcelo Matus.

05/21/2002: beazley
            The %types directive can now be used to specify inheritance relationships
            in the runtime type system.  For example,

                %types(Foo = Bar);

            specifies that Foo isa Bar.    Using this is potentially quite dangerous.
            However, this is useful in certain cases (and in the SWIG library).
            
05/20/2002: beazley
            %nodefault and %makedefault directives now require a trailing semicolon.
            For example:

                %nodefault;
                ...
                %makedefault;

            In addition both directives can take a class name.  For example:

                %nodefault Foo;

                class Foo {   /* No default constructor/destructor */
                };

                class Bar {  /* Default constructor/destructor generated */
                };

            *** POTENTIAL INCOMPATIBILITY ***
            If you don't use the trailing semicolon, things will mysteriously break.

05/20/2002: beazley
            More improvements to type system handling.  SWIG now correctly handles
            template names and parameters in a namespace. For example:

                namespace foo {
                    template<class T> class bar { };
                    typedef int Integer;

                    void blah(bar<Integer> *x);
                };

            In the generated code, all of the typenames are properly qualified.

05/17/2002: cheetah (William Fulton)
            [Java] deprecated broken -jnic and -jnicpp commandline options. The C or C++ 
            JNI calling convention is now determined from the -c++ commandline option.

05/16/2002: cheetah (William Fulton)
            [Java] The JCALL macros which exist so that the same typemaps can be used
            for generating both the C and C++ JNI calling conventions no longer appear
            in the generated code. This is because the output is now passed through the 
            SWIG preprocessor which does the macro expansion for either C or C++ (depending
            on whether -c++ is passed on the SWIG commandline).

            The generation of the functions used in the array typemaps have been adjusted 
            to take account of this. The side effect is that any typemaps which contained 
            JCALL macros within %{ %} brackets will have to be moved within {} brackets 
            so that the SWIG preprocessor can expand the macros.

            *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***

05/13/2002: beazley
            Class templates may now be used as template parameters.  For example:

              template<class T, template<class> class C> class Foo {
                  ...
              };
              template<class T> class Bar {
                  ...
              };

              %template(Fooi) Foo<int, Bar>;
     
            SWIG doesn't really do anything special with this---it's just
            another way of specifying a template parameter.  
         
05/13/2002: beazley
            Minor refinement of template support.  Template parameter names are no longer
            required for types.  For example:

                template<bool> class Foo {
                };

            Obviously, names are required for template<class T>;

05/12/2002: beazley
            New macro expansion in typemaps.  The sequence:

                $descriptor(type)

            Will expand into the SWIG type descriptor structor for
            the given type.  Type may be any abstract datatype.
            For example:

                $descriptor(int *)
                $descriptor(int (*)(int,double))
                $descriptor(vector<int> *)

            Caveat: It is *NOT* currently legal to use other typemap
            substitution variables in the macro.  For example 
            $descriptor($1_type).

            The primary purpose of this modification is to better
            support typemaps for container objects or to allow typemaps
            that might be performing type conversions.
            *** NEW FEATURE ***

05/11/2002: beazley
            The wrapping of references to primitive types has been
            changed as follows:

            Arguments of type 'const primitive &' are now passed
            by value as opposed to pointers.  Return values of
            type 'const primitive &' are returned as values instead of
            pointers.

            'primitive' is any one of int, short, long, long long,
            char, float, double, bool (as well as unsigned variants).
            
            This change is being made to better support C++ wrapping--especially
            code that makes use of templates and the STL.
            
05/11/2002: beazley
            The %template directive can now be used to access templates
            in a namespace.  For example:

                namespace std {
                    template<class T> class complex {
                       T re, im;
                    public:
                       complex(T _r = T(), T _i = T()) : re(_r), im(_i) { }
                       T real() { return re; }
                       T imag() { return im; }
                    };
                }

                %template(complex) std::complex<double>;

            Note: There are some very subtle namespace/symbol table 
            management issues involved in the implementation of this.
            It may not work in certain cases.

05/10/2002: beazley
            Member template constructor support added.  For example:

               template<typename _T1, typename _T2> 
               struct pair {
                 _T1 first;
                 _T2 second;
                 pair() : first(_T1()), second(_T2()) { }
                 template<class _U1, class _U2> pair(const pair<_U1,_U2> &x);
               };

            To instantiate the template, use %template and %extend.
            For example, this expands the constructor into a default
            copy constructor:

               %extend pair {
                  %template(pair) pair<_T1,_T2>;
               }
            
            Highly experimental.  Other uses may be broken.

05/10/2002: beazley
            The %extend (%addmethods) directive no longer works unless
            it appears in the public section of a class.   An error
            message is now generated (as opposed to a segmentation fault).

05/09/2002: beazley
            New %warnfilter() directive.  This directive attaches a warning
            filter to specific declarations and has the same semantics as
            %rename, %ignore, %feature, and so forth.  For example:

               %warnfilter(501) foo;   // Suppress overloaded warning
               int foo(int);
               int foo(double); 

            or

               %warnfilter(501) Object::foo(double);
               class Object {
               public:
                  int foo(int);
                  int foo(double);
               };

            This feature only suppresses warnings in later stages of code
            generation.  It does not suppress warnings related to preprocessing
            or parsing.
            *** NEW FEATURE ***

05/09/2002: beazley
            SWIG now supports C99 variadic preprocessor macros.  For example:

               #define debugf(fmt,...) fprintf(stderr,fmt,__VA_ARGS__)

            The argument "..." is used to indicate variable arguments which
            are all placed into the special argument name __VA_ARGS__ in
            the macro expansion.  

            SWIG also implements the GNU (##) extension for swallowing the
            preceding comma when __VA_ARGS__ is empty. For example:

               #define debugf(fmt,...) fprintf(stderr,fmt, ##__VA_ARGS__)

            Here is how this is expanded:

               debugf("%d", 3)  --> fprintf(stderr,"%d",3)
               debugf("Hello")  --> fprintf(stderr,"Hello" )

            (notice the deleted comma).
            *** NEW FEATURE ***

05/08/2002: samjam (Sam Liddicott)
            Many changes to php module.  Shadow classes are now implemented
            entirely in native C and no need for php-code shadow wrappers
            Populated template config.m4 and Makefile.in as needed by
            phpize are generated.

05/08/2002: ljohnson (Lyle Johnson)
            [Ruby] A copy constructor is now turned into a "clone"
            instance method (see Dave's change for copy constructors
            dated 4/7/2002). This seems like the appropriate thing
            to do for Ruby code.

05/08/2002: ljohnson (Lyle Johnson)
            [Ruby] Fixed [ 553864 ] Inline destructor code not written.

05/08/2002: beazley
            %ignore behaves better with constructors, destructors, and the
            type system in general.   For constructors and destructors,
            %ignore now suppresses the creation of a default constructor
            or destructor.  For example:

                 %ignore ~Foo;
                 class Foo {
                 public:
                     Foo();
                    ~Foo();
                     ...
                 };

            In SWIG-1.3.11, ~Foo() simply "disappeared" and the code generator
            created a wrapper for a default destructor (as if it was never
            declared in the interface).  In SWIG-1.3.12, %ignore suppresses
            the creation of a destructor if one is actually defined. 

            Similarly, even though a declaration is ignored, information
            may still be needed to properly handle types. For example, here
            is a very subtle error that is fixed by this change:

                %ignore std::string;         // Prevent class wrapping
                namespace std {
                   class string {
                        ...
                   };
                   %typemap(in) string * {
                        ...
                   }
                }
                
                void foo(std::string *s);   // Broken.

            Before this fix, %ignore would cause the class definition to disappear.
            This, in turn, would cause the typemap to be misapplied. 
 
05/08/2002: beazley
            Minor changes to %rename, %ignore, %feature, and related directives
            for better support of destructors.  Destructors can now be precisely
            tagged.  For example:

                  %ignore Foo::~Foo;
                  %feature("action") ~Bar {
                      ...
                  }
             
            *Developer warning* 
            Operations such as renaming and feature attachment for classes used to
            be applied to destructors as well.  For instance, if you did this:
 
                 %rename(Bar) Foo;

            The operation applied to the class itself, the constructor, and
            the destructor.   This is no longer the case.  Now such operations
            will only apply to the class and the constructor.  Note: if you
            were relying on this for class renaming, be aware that renamed
            classes should really only be handled at the level of the class itself
            and not the level of individual declarations in the class (although
            they can be renamed individually if needed).  As far as I know,
            the Language class is already taking care of this case correctly.

05/07/2002: beazley
            New set of tests.  The Examples/test-suite/errors directory contains
            tests that try to exercise all of SWIG's error and warning messages.

05/07/2002: beazley
            Start of a warning framework.  Warning messages are now assigned numeric values
            that are shown in warning messages.   These can be suppressed using the
            -w option.  For example:

                 swig -w302 example.i
                 swig -w302,305 example.i

            Alternatively, the #pragma preprocessor directive can be used to disable this:

                 #pragma SWIG nowarn=302
                 #pragma SWIG nowarn=302,305

            Note: Since SWIG is a multi-pass compiler, this pragma should
            only be used to change global settings of the warning filter.  It should
            not be used to selectively enable/disable warnings in an interface file.
            The handling of #pragma occurs in the C++ preprocoessor and affects all 
            subsequent stages of compilation.

            The -Wall option turns on all warnings and overrides any filters that
            might have been set.

            Warnings can be issued from an interface using %warn.  For example:

                 %warn "110:%section is deprecated"

            The first part of a warning message is an optional warning number.
            A complete set of warning numbers is found in Source/Include/swigwarn.h.
            *** NEW FEATURE ***

05/07/2002: beazley
            Internal parsing change.   Directives to include files now use brackets [ ... ]
            instead of { ... }.   

                  %includefile "foo.i" [
                     ...
                  ]

            The use of { ... } was a bad choice because they were included implicitly by
            the preprocessor and made it impossible to properly detect legitimate missing '}' 
            errors.

04/16/2002-
05/02/2002: beazley
            SWIG European Tour: Paris-Amsterdam-Bath.

04/23/2002: beazley
            The %addmethods directive has been renamed to %extend.
            For example:

                class Foo {
                ...
                };

                %extend Foo {
                   int blah() { ... };
                   int bar() { ... };
                   ...
                };

            Motivation: the %addmethods directive can be used for many
            other tasks including adding synthesized attributes, constructors,
            and typemaps. Because of this, "addmethods" is somewhat misleading.
            %extend more precisely describes this operation---extension of a
            class or structure.

            *** POTENTIAL INCOMPATIBILITY ***
            %addmethods still works via a macro definition.   However,
            a warning message may be generated.   Errors involving %addmethods
            will actually refer to the %extend directive.  
            
04/23/2002: beazley
            Further refinement of the type system.  Typedef now
            propagates through functions, pointers to functions,
            and pointers to member functions.
            For example:

               typedef int Integer;
               void foo(int (*x)(int), Integer (*y)(Integer));

            In this case, arguments 'x' and 'y' have exactly
            the same type (and would obviously accept objects
            of either type).

            Similarly, consider this:

               class Foo {
               };

               typedef Foo Bar;
               void bar(int (Foo::*x)(int), int (Bar::*y)(int));

            In this case, arguments x and y are the same 
            type (via typedef).
            
04/22/2002: beazley
            SWIG now generates a warning message if any part of
            an expression involves values from a private part of a class.
            For example:

                class Foo {
                private:
                    static int X;
                public:
                     void blah(int a, int b = X);   // Warning
                };

            In this case, the default argument is ignored.  There
            are workarounds, but they are rather clumsy.  For instance,
            you might do this:

                    %feature("action") blah(int,int) {
                       if ($nargs == 1) {
                          result = blah(arg1);
                       } else {
                          result = blah(arg1,arg2);
                       }
                    }
                    void blah(int a, int b = 0);


04/21/2002: beazley
            Use of the %inline directive inside a namespace is
            forbidden and now generates an error message.   This is
            not allowed since the inlined code that is emitted is
            not placed inside a namespace.  This confuses other
            stages of parsing.
                    
04/21/2002: beazley
            Some bug fixes to casting operations and expression
            parsing.   Due to some parsing issues, it is not 
            currently possible to use casts for all possible
            datatypes.   However, the common cases work.

04/20/2002: beazley (Amsterdam)
            Member templates now work.  Simply use the %template
            directive inside a class or %addmethods to create
            instantiations (see Doc/Manual/SWIGPlus.html).  Supporting
            this was easy---earlier changes to templates made it
            possible using only a two-line modification to the parser
            and a few minor modifications elsewhere.  Hmmm, come to 
            think of it, the smoke was rather thick in that Internet "cafe".
            *** NEW FEATURE ***
            
04/19/2002: beazley (TGV)
            Improved handling of non-type template parameters.  For example:

                 vector<int,100>;

            Simple numbers and strings can be used with the %template
            directive as well.  For example:

                 %template(vecint100) vector<int,100>;

            Note: Arithmetic expressions are not currently allowed.
            
            Default template arguments now work and do not have to
            be given to %template.
                        
04/18/2002: beazley (Paris)
            Change in internal template handling.  Template
            parameters are now fully integrated into the type
            system and are aware of typedefs, etc.  This builds
            upon the change below.   

            *** DEVELOPER WARNING ***
            Word of caution to language module writers.  The "name"
            parameter of certain parse tree nodes (classes, functions, etc.)
            may be parameterized with types.   This parameterization is
            done using SWIG type-strings and not the underlying C version.
            For example,

               int max<int *>(int *,int *)  

            has a name of "max<(p.int)>".  If you use the name directly,
            you may get syntax errors in the generated code.  To fix this,
            use SwigType_namestr(name) to convert a parameterized name 
            to a C name with valid syntax.  The internal version is
            used to reduce template types to a common representation 
            and to handle issues of typedef.
            
04/16/2002: beazley (somewhere over the Atlantic)
            Enhancement of typedef resolution.  The type system is now
            aware of template arguments and typedef.  For example:

                  typedef int Integer;
                 
                  foo(vector<int> *x, vector<Integer> *y);

            In this case, vector<int> and vector<Integer> are
            the same type.   There is some interaction between this
            mechanism and the implementation of typemaps.  For example,
            a typemap defined for vector<int> * would apply to either type.
            However, a typemap for vector<Integer> * would only apply to
            that type.

            Typedefs and typemaps and matched by left-most expansion.
            For example:

              vector<Integer,Integer> --> 
              vector<int, Integer> -->
              vector<int, int>


04/24/2002: cheetah (William Fulton)
            [Java] Changes to Java shadow classes.
            Overcomes a bug where the module assumed that a pointer to a derived
            class could be used in place of a pointer to a base class. Thanks 
            to Stephen McCaul for analysing the bug and submitting patches.

            A consequence is that the getCPtr() method in each shadow class has
            disappeared and has been replaced with a getCPtrXXX(), where XXX is the 
            shadow class name. If you have code that previously used getCPtr(), 
            and the associated class is wrapping a C struct or a C++ class that
            is not involved in an inheritance chain, just use the new method. If
            however, the class is involved in an inheritance chain, you'll have
            to choose which pointer you really want. Backwards compatibility 
            has been broken as not using the correct pointer can lead to weird bugs
            through ill-defined behaviour. If you are sure you want the old methods, 
            you could add them back into all shadow classes by adding this at the 
            beginning of your interface file:

            %pragma(java) allshadowcode=%{
              public long getCPtr(){
                return swigCPtr;
              }
            %}

            Please see entry dated 07/23/2002 to see how to do this after the deprecation
            of the allshadowcode pragma.

            *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***

04/13/2002: beazley
            Fixed problem with default arguments and references.   Declarations such 
            as this should now work:

                void foo(const string &x = "Hello");

04/12/2002: beazley
            Added typemap $* substitutions for typemaps involving arrays.
            Requested by William Fulton.

04/11/2002: beazley
            Template specialization is now supported.  For example:

               template<> class vector<int> {
               ...
               };

            When the %template directive is used, it will use a specialization
            if one is defined.   There are still some limitations. Partial
            specialization is not supported.  A template of type <void *> does
            not match all pointers.
            *** NEW FEATURE ***

04/11/2002: beazley
            Major change to template wrapping internals. Template declarations are
            no longer processed as macros but now result in real parse-tree
            nodes.  The %template directive expands these nodes into a
            specific instantiation.   This change enables a number of
            new and interesting capabilities:

            Directives such as %rename, %feature, and %addmethods can
            now be applied to uninstantiated templates.  For example:

              %rename(barsize) vector::bar(char *buf, int len);
              ...
              template<typename T> class vector {
              public:
                 ...
                 void bar(char *buf);
                 void bar(char *buf, int len);   // Renamed
                 ...
              };

              %template(intvector) vector<int>;   // Renaming carries through

            
            By parsing templates into an internal data structure, it will
            be possible to support specialization (and maybe partial
            specialization).
            
            This is highly experimental and a work in progress.

            *** POTENTIAL INCOMPATIBILITY ***
            In SWIG-1.3.11, template declarations were simply processed
            as weird macros.  No other information was retained.   This 
            made it impossible to support more advanced features and 
            complicated many other parts of the implementation.

04/09/2002: beazley
            Change to template class wrapping.   There were a variety of
            "issues" with the old approach related to parsing, the type
            system, and namespaces.   These changes are meant to rectify
            some of these problems:

            A specific instantiation of a template can now be specified
            by including the class inline like this:
 
                  class vector<int> {
                  public:
                       vector();
                      ~vector();
                       ... whatever ...
	                  };

            This is template specialization, but partial specialization is
            not yet implemented.
            
            The %template directive has been modified to expand roughly as
            follows:

                 %template(vecint) vector<int>;

            becomes

                 %rename(vecint> vector<int>;
                 class vector<int> {
                 public:
                     vector();
                     ...
                 };

            Note that this simply builds upon the code above (templates
            included inline).

            This modified approach to wrapping fixes some subtle type
            issues.  For instance, you can now define typemaps and typedefs
            like this:

                 %typemap(in) vector<int> * {
                 ...
                 }
                 typedef vector<int> intvector;
                 ...
                 void blah(intvector *v);   // Gets the above typemap

            This did not work in SWIG-1.3.11 due to a peculiarity of
            the template implementation.

            %template(name) no longer installs the template as a class
            with name "name".   This might break %addmethods as described
            in the manual.  For example:

                 %template(vecint) vector<int>;
                 %addmethods vecint {    // Fails. vecint not a class
                   ...
                 };
           
            To fix this, just use the template name instead:

                 %addmethods vector<int> {
                     ...
                 }

            Note: This technique might be a way to implement some bizarre
            template specialization techniques.   For example:

                 %addmethods vector<int> {
                     // Only applied if vector<int> instantiated later
                     %typemap(in) vector<int> * {
                        ...
                     }
                     ...
                 };

            *** POTENTIAL INCOMPATIBILITY ***
             
04/08/2002: beazley
            Fixed [ 540868 ] #if defined whatever - not parsed.  SWIG should
            now correctly handle preprocessor directives like this:

                #if defined __cplusplus
                ...
                #endif
             
            Note: was implemented previously, but there was a minor bug.
            Reported by Adam Hupp.
                   
04/07/2002: beazley
            %readonly and %readwrite are deprecated due to a change in the 
            implementation.  Instead of being pragmas, mutability is now
            controlled as a "feature" using the following two directives:

                 %immutable;
                 int x;           // read-only variable
                 int y;           // read-only variable
                 %mutable;
                 int z;           // Modifiable

            %immutable and %mutable are much more powerful than their older
            counterparts.  They can now pinpoint a specific declaration like
            this:

               %immutable  x;         /* Any x */
               %immutable  Foo::x;    /* x in class Foo */

            In fact, the matching algorithm is the same as for %rename, 
            %ignore, and other directives.   This means that the declaration
      
               %immutable  Foo::x;

            would not only apply to class Foo but to all derived classes
            as well.

            *** POTENTIAL INCOMPATIBILITY ***
            %immutable and %mutable must be terminated by a semi-colon.  This
            differs slightly from the older %readonly and %readwrite directives.
            Since %immutable and %mutable can be applied to declarations the
            semicolon is needed to distinguish between a global feature and 
            one targeted to a single declaration.  Note: this incompatibility is the
            primary reason for changing the name of the directive.

04/07/2002: beazley
            New handling of copy constructors.  If a class defines 
            constructors like this:

                class Foo {
                public:
                      Foo();
                      Foo(const Foo &);       // Copy constructor
                      ...
                };

            SWIG now generates a function copy_Foo() for the copy
            constructor.

            In previous verions, this generated a name-clash and an
            error message.   To preserve backwards compatibility, SWIG
            does not change the behavior if %rename is used to resolve
            the name conflict.   However, if no name resolution is made,
            this new approach is used.

            Copy constructors may be handled as a special case in the
            target language.  However, this is up to the language module
            itself.
                  
04/07/2002: beazley
            The %template directive is now namespace aware.   This allows
            code like this:

                namespace foo {
                    template<typename T> max(T a, T b) { return a > b ? a : b; }
                }

                using namespace foo;
                %template(maxint) max<int>;            // Ok

                namespace bar {
                   using foo::max;
                   %template(maxdouble) max<double>;   // Ok
                }

            Caveat: the template name supplied to %template must be defined in the
            same scope in which the %template directive appears.   This code is
            illegal:

                %template(maxint) foo::max<int>;

04/07/2002: beazley
            Minor enhancement to preprocessor.   The preprocessor can now perform
            string comparison.   For example:

               #define A "hello"
               ...
               #if A == "hello"
               ...
               #endif

            The primary use of this is in SWIG macros.  For example:

              %define FOO(x) 
              #if #x == "int"
              /* Special handling for int */
              ...
              #endif
              %enddef

            Normal users can probably safely ignore this feature.  However, it may
            be used in parts of the SWIG library.

04/07/2002: beazley
            Further refinement of default constructor/destructor wrapper generation.
            SWIG is now much more aware of pure virtual methods. For instance:

              class A {             /* Abstract */
              public:
                 virtual void method1() = 0;
                 virtual void method2() = 0;
              };
              class B : public A {  /* Abstract */
              public:
                 virtual void method1() { };
              };

              class C : public B {  /* Ok */
              public:
                 virtual void method2() { };
              };

            In this case, SWIG will only generate default constructors for C.
            Even though B looks fine, it's missing a required method and is abstract.

04/04/2002: beazley
            Subtle change to structure data member access.  If you
            have a structure like this:

                struct Foo {
                    Bar   b;
                };

            The accessor functions for b are generated as follows:

            (1) If b is *not* defined as a structure or class:

                Bar Foo_b_get(Foo *self) {
                    return self->b;
                }
                void Foo_b_set(Foo *self, Bar value) {
                    self->b = value;
                }

            (2) If b *is* defined as a structure or class:

                Bar *Foo_b_get(Foo *self) {
                    return &self->b;
                }
                void Foo_b_set(Foo *self, Bar *value) {
                    self->b = *value;
                }
            See the "Structure data members" section of Doc/Manual/SWIG.html
            for further details.

            *** POTENTIAL INCOMPATIBILITY ***
            This may break interfaces that relied on a lot of a undeclared
            structure and class names.    To get the old behavior, simply
            use a forward declaration such as "struct Bar;"
            
04/04/2002: beazley
            C++ namespace support added.  SWIG supports all aspects of
            namespaces including namespace, using, and namespace alias
            declarations.    The default behavior of SWIG is to flatten
            namespaces in the target language.  However, namespaces are
            fully supported at the C++ level and in the type system.
            See Doc/Manual/SWIGPlus.html for details on the implementation.
     
04/02/2002: cheetah (William Fulton)
            [Java] Sun has modified javac in jdk1.4 to no longer compile
            an import of an unnamed namespace. To fix this SWIG no longer 
            generates the import for packageless classes.
            http://developer.java.sun.com/developer/bugParade/bugs/4361575.html
            As reported SF #538415.

03/27/2002: ljohnson (Lyle Johnson)
            [Ruby] Added support for pointer-to-member, similar to that
            for the Python module. Remarkably similar. Also added a new
            example for this (Examples/ruby/mpointer), which is remarkably
            similar to the Python example of the same name.

03/26/2002: ljohnson (Lyle Johnson)
            [Ruby] Made a few minor edits to the "Advanced Topics"
            chapter of the SWIG manual and added a new major section
            about how to create multi-module Ruby packages with SWIG.

03/26/2002: ljohnson (Lyle Johnson)
            [Ruby] Removed all of the old Ruby pragmas. If any of this
            functionality is truly missed we can resurrect it, preferably
            with some kind of feature-based directive.
            
03/25/2002: ljohnson (Lyle Johnson)
            [Ruby] Fixed SWIG exception library support for Ruby, which
            has apparently been broken for some time. Luckily, no one seems
            to have noticed.

03/23/2002: beazley
            C++-namespace support in SWIG directives.

            %addmethods: 

            The %addmethods directive now accepts a fully qualified classname
            and can be used inside C++ namespace declarations.  For example:

                 // Attaches to the class Foo::Bar below
                 %addmethods Foo::Bar {
                     int somemethod() { ... }
                 };

                 namespace Foo {
                    class Bar {
                    public:
                        ...
                    };
                 
                    // Attaches to the class Bar above
                    %addmethods Bar {
                      int othermethod() { ... };
                    }
                 }

            %feature, %rename, %ignore, %exception, and related directives:

            Namespaces are fully integrated into the the renaming and declaration
            matcher.  For example:

                 %rename(display) Foo::print;          // Rename in namespace Foo
                 %ignore Foo::Bar::blah;               // Ignore a declaration

            %rename directives can be placed inside namespace blocks as well. For
            example:

                namespace Foo {
                   %rename(display) print;         // Applies to print below

                   void print();
                };

            Most other SWIG directives should work properly inside namespaces.
            No other changes are needed.
      
03/22/2002: beazley
            Some changes to internal symbol table handling.   SWIG no longer
            manages structures and unions in a separate namespace than normal
            declarations like ANSI C.  This means you can't have a structure
            with the same name as a function.  For example:

                 struct Foo {
                 ...
                 }
 
                 int Foo() { ... }

            This approach is more like C++.   It's not clear that SWIG ever
            really supported the ANSI C anyways---using the same name would
            almost certainly generate a name-clash in the target language.

03/22/2002: ljohnson (Lyle Johnson)
            [Ruby] Fixed [ 517302 ] for handling of renamed overloaded
            constructors. Now, renamed overloaded constructors are converted
            into class singleton methods (basically acting as "factory"
            methods).

03/21/2002: beazley
            Fixed [ 532957 ] %ignore parse error and casting operator.
            Reported by William Fulton.

03/18/2002: beazley (** ADVANCED USERS ONLY **)
            Added support for dynamic casting in return values.  A somewhat
            common problem in certain C++ programs is functions that hide
            the identity of underlying objects when they are returned 
            from methods and functions.  For example, a program might include
            some generic method like this:

                      Node *getNode();

            However, Node * may just be base class to a whole hierarchy
            of different objects.   Instead of returning this generic Node *,
            it might be nice to automatically downcast the object into the
            appropriate type using some kind dynamic cast.

            Assuming you understand the peril involved, a downcast can now
            be performed using the following function in the run-time type
            checker:

              swig_type_info *SWIG_TypeDynamicCast(swig_type_info *, void **ptr);

            This function checks to see if the type can be converted to another
            type.  If so, a different type descriptor (for the converted type)
            is returned.   This type descriptor would then be used to create
            a pointer in the target language.

            To use this, you would write a typemap similar to this:

              %typemap(out) Node * {
                swig_type_info *ty = SWIG_TypeDynamicCast($1_descriptor, (void **) &$1);
                $result = SWIG_NewPointerObj($1, ty);
              }

            Alternatively,

              %typemap(out) Node * = SWIGTYPE *DYNAMIC;

            To make the typemap have any effect, you have to write a supporting 
            function that knows how to perform downcasting. For example:

              %{
              static swig_type_info *
              Node_dynamic_cast(void **ptr) {
                 Node **nptr = (Node **) ptr;
                 Element *e = dynamic_cast<Element *>(*nptr);
                 if (e) {
                    *ptr = (void *) e;
                    return SWIGTYPE_p_Element;
                 }
                 Data *d = dynamic_cast<Data *>(*nptr);
                 if (d) {
                    *ptr = (void *) d;
                    return SWIGTYPE_p_Data;
                 }
                 return 0;
              }
              %}

            There is no restriction on how types are determined. dynamic_cast<>
            uses C++ RTTI.  However, if you had some other mechanism for determining
            the type, you could use that here.  Note: it is important to save
            the new pointer value back into the argument as shown.  When downcasting,
            the value of the pointer could change. 

            Finally, to make the casting function available, you have to register
            it with the run-time type checker. Put this macro in your interface file.

               DYNAMIC_CAST(SWIGTYPE_p_Node, Node_dynamic_cast);

            Note: this feature does not introduce a performance penalty on 
            normal SWIG operation.  The feature is only enabled by writing
            a new typemap that explicitly calls SWIG_TypeDynamicCast() to
            make a conversion. 
  
            Examples/test-suite/dynamic_cast.i contains a simple example.
            This feature is not supported in the Java module due to differences
            in the type-checking implementation.

            *** EXPERIMENTAL FEATURE ***

03/17/2002: beazley
            Small change to type-name handling of unnamed structures and
            typedef.  If a structure of this form appears:

                   typedef struct {
                        ...
                   } Foo;

            Then 'Foo' is used as the proper typename for the structure.
            Furthermore, Foo can now be used as a name in C++ inheritance.
            SWIG was already kind of doing this, but this modification refines
            the implementation to more closely follow the C++ ARM, section
            7.1.3, p. 106.  This fixes a couple of obscure corner cases.

03/16/2002: beazley
            Modified C++ inheritance with a few enhancements.  First, type information
            needed for casting and type-equivalence is generated even when base-classes
            aren't defined in the interface.  For example:

                class Foo : public Bar  {    /* Bar unspecified */
                public:
                  ...
                };

               void blah(Bar *b);

            In this case, the blah() function still accepts Foo * even though nothing
            is really known about Bar.   Previous SWIG versions would just generate
            a type error.

            Inheritance has also been modified to work through typedef.  For example:

               class Bar {
               };

               typedef Bar OtherBar;
               class Foo: public OtherBar {
               }

            In this case, the base class of OtherBar is correctly resolved back to
            Bar.   The use of the name OtherBar is lost in this resolution (the wrappers
            will simply use Bar instead of the typedef name OtherBar).
           
03/13/2002: beazley
            %typemap, %apply, and related directives can now appear inside
            class definitions.   

03/13/2002: beazley
            Fixed a variety of problems related to compiling SWIG on 64-bit
            platforms.

03/12/2002: beazley
            Fixed problem with "ignore" and "in" typemaps.  Local variables
            associated with "in" were being added to the wrapper function even
            though they were never used.   Mostly harmless, but it would lead
            to a variety of compilation warnings.
  
03/12/2002: beazley
            Some changes to the internal type system and handling of nested C++
            types.   In previous versions of SWIG, if you had the following:

                 class Foo {
                 public:
                      typedef int Blah;
                 };
                 class Bar : public Foo {
                 public:
                       void somemethod(Blah x);
                 };

            The argument type in somemethod() would implicitly be set to Bar::Blah.
            Although this is technically allowed, it breaks typemaps.  For example:

                 %typemap(in) Foo::Blah { ... }

            doesn't match like you expect.   This has been changed in SWIG-1.3.12.
            Now, types are expanded using the class in which they were defined.
            So, the argument type in somemethod() will be Foo::Blah---since the
            type Blah was defined in Foo.
 
03/10/2002: beazley
            Fixed some subtle type scoping problems with typedef and C++ classes.
            For example:
 
                typedef int Blah;
                class Bar {
                public:
                    typedef double Blah;
                    void foo(Blah x, ::Blah y);
                ...
                }

03/10/2002: beazley
            Highly experimental change to handle variable length arguments.
            First, there is no portable or reliable way to wrap
            a varargs function in full generality.  However, you *can* change
            the function signature using %varargs.

               %varargs(char *) fprintf;
               ...
               void fprintf(FILE *f, char *fmt, ...);

            In this case, the variable length parameter "..." is
            simply replaced by the parameters given in %varargs. This
            results in a function like this:

               void fprintf(FILE *f, char *fmt, char *s);

            More than one argument can be used and default values
            can be defined.  For example, this code specifies a
            maximum of four arguments.

               %varargs(char *x1 = 0, char *x2 = 0, char *x3 = 0, char *x4 = 0) fprintf;
 
            *** EXPERIMENTAL NEW FEATURE ***
 
03/10/2002: beazley
            Change to handling of variable length arguments.  varargs
            is now handled as a proper parameter and is passed to the
            code generator.  However, it still can't be handled correctly
            (and will generate a typemap warning).   This change has been
            made to better incorporate variable length arguments with other
            directives such as %ignore, %rename, %feature, and so forth.

03/10/2002: beazley
            Fixed [ 522555 ] Syntax error parsing "define" construct. SWIG
            is a little more restrictive in determining #define statements
            that will be wrapped as constants.  Also added a better parser
            error rule for handling bad constants.

03/08/2002: cheetah (William Fulton)
            [Java] Bug fix: Classes renamed with %rename that are derived from 
            another class generate more appropriate shadow class code.

03/08/2002: cheetah (William Fulton)
            [Java] Fixed SF [ #523632 ] and [ #513335 ] both reported by Israel 
            Tanner. Support for types that are used which are in a typedef. The
            appropriate shadow class name is generated. Also generated correct
            shadow classname when a templated class is used within another 
            templated class. See the cpp_typedef.i testcase.

03/08/2002: cheetah (William Fulton)
            [Java] Bug fix: No type was generated in shadow classes for types 
            that weren't wrapped by SWIG.  The type is treated as a raw 
            pointer, ie no shadow class.

02/22/2002: beazley
            Refined the matching algorithm used by %rename, %ignore, and
            %feature.   If a type signature is supplied, it must exactly
            match that used in the declaration---including any use of
            const.  For example:

                %rename(foo1)   foo(int);
                %rename(bar1)   bar(int) const;

                class Blah {
                   public:
                      void foo(int);       // Matched --> foo1
                      void foo(int) const; // Not matched 
                      void bar(int);       // Not matched
                      void bar(int) const; // Matched --> bar1
                }

            In previous versions, a non-const specification would match
            both the non-const and const declarations.  However, the whole
            point of %rename and related directives is that they be able
            to precisely pinpoint exact declarations in an interface.  This
            fixes the problem.

02/21/2002: beazley
            Reworked the handling of default constructor and destructors.
            SWIG now makes a preliminary pass over the parse tree to discover
            which classes support default allocation.   This fixes a number
            of very subtle issues in code generation and call/return by value.

02/18/2002: cheetah (William Fulton)
            Improved support on Cygwin: Perl, Python, Tcl, Ruby and Java should
            work out of the box, barring the runtime library. Removed dllwrap 
            and replaced with newly working gcc -shared instead for Cygwin. 
            All this will require the new improved binutils 20010802 and later,
            but the latest Cygwin is usually the best recommendation.

02/15/2002: beazley
            Fixed some problems related to wrapping of global variables
            and Perl shadow classes. Reported by Chia-liang Kao.

02/15/2002: ljohnson (Lyle Johnson)
            [Ruby] Made a fix to the code generation for C++ class
            constructors so that we get both a "new" singleton method
            and an "initialize" instance method for each class. This
            change enables developers to derive new Ruby classes from
            SWIG-wrapped C++ classes and then override their initialize
            methods to provide subclass-specific instance initialization.

02/15/2002: ljohnson (Lyle Johnson)
            [Ruby] Massive documentation update for the Ruby module,
            contributed by Craig Files.

02/14/2002: ljohnson (Lyle Johnson)
            [Ruby] Bug fix: An error in the SWIG runtime support for Ruby
            was causing several of the examples to fail. Reported by
            William Fulton.

02/14/2002: ljohnson (Lyle Johnson)
            [Ruby] Bug fix: Enumerations defined within a class (such
            as those seen in the Examples/ruby/enum example) were not
            being exported with the correct names. Reported by William
            Fulton.

02/13/2002: ljohnson (Lyle Johnson)
            [Ruby] Added a warning message when we run across overloaded
            class constructors for C++ code, that this is currently not
            supported (even if the overloads have been %renamed). For an
            example of where this doesn't work, see Examples/ruby/operator.

02/13/2002: ljohnson (Lyle Johnson)
            [Ruby] Added an "ignored" warning message when the parser runs
            across an operator!=() declaration for C++ code.

02/11/2002: ljohnson (Lyle Johnson)
            [Ruby] Added the "import", "import_template", "operator" and
            "template" examples.

02/11/2002: ljohnson (Lyle Johnson)
            [Ruby] Added multi-module support.

02/09/2002: ljohnson (Lyle Johnson)
            [Ruby] Added the missing "#define SWIG_NOINCLUDE" at the top of
            the wrapper code when the '-c' option is used.

02/09/2002: ljohnson (Lyle Johnson)
            Corrected a minor off-by-one error for the size of the
            swig_types[] array that's generated in the wrapper code.

02/08/2002: beazley
            Fixed SF [ #515058 ] Wrong code for C++ templates.
            Reported by Israel Taller.

Version 1.3.11 (January 31, 2002)
=================================

01/30/2002: beazley
            Fix to pass/return by value for C++ objects that define
            no default constructor.  Changes to the typemap system
            made it impossible to wrap C++ objects with no default
            constructor.   This has been fixed, but the solution 
            involves some clever template magic contributed by 
            William Fulton.  Please see the comments in the file
            Lib/swig.swg for further details.  This solution is
            experimental and may be refined in a future release.

01/30/2002: beazley
            Global variables and member data of type "const char *"
            can be set, but the old value is silently discarded without
            any garbage collection.   This may generate a memory leak.
            This change is needed to more safely handle variables
            like this:

                   const char *foo = "Hello World\n";

            In this case, it's not safe to free the old value.  However,
            SWIG can dynamically allocate a new value and make foo point
            to it.   To fix this memory leak, you can probably do this:

               %clear const char *foo;
               %apply char * {const char *foo};

            *** POTENTIAL INCOMPATIBILITY ***
            
01/30/2002: beazley
            Two minor typemap enhancements have been added.  First,
            typemaps can issue a warning message by including a special
            warning attribute. For example:

             %typemap(in,warning="I'm going to do something dangerous") ...

            The warning message will show up whenever the typemap is
            applied.

            Second, a typemap can force a no-match by defining

             %typemap(in) sometype "pass";

            If this is used, the typemap system will *not* record a
            typemap match for "sometype".   This can be used to block
            selected typemaps.  For example, if you wanted to disable
            a typemap feature for some type, you could do this.

               // Do not allow global variables of type 'const char *' to be set.
               %typemap(varin) const char * "pass";

            It might also be possible to use this to do subtle and
            strange things with typemaps.  For example, if you wanted to
            make 'blah *' an output value and 'const blah *' an input
            parameter, you might do this:

                %typemap(ignore) blah *(blah temp) {
                    $1 = &temp;
                }
                %typemap(argout) blah * {
                    ... return a value ...
                }
                /* Block unqualified typemaps defined above */
                %typemap(ignore) const blah * "pass";
                %typemap(argout) const blah * "pass";
                %typemap(in)     const blah * {
                    ... get input value ...
                }

             (This potential applications of typemaps suggested by Greg Stein).
            *** NEW FEATURE ***

01/29/2002: cheetah (william fulton)
           [Java] Bug fix: No enumerations were wrapped when the -shadow 
           commandline option was not specified. Reported by Israel Taller.

01/28/2002: cheetah (william fulton)
           [Java] Global arrays are successfully wrapped. In fact they started
           mostly working in SWIG-1.3.10.

01/28/2002:richardp
	   Added first attempt at C++ and -shadow support for PHP4 module,
	   please test and mail me if any problems/ideas on improving it.

	   There is a known problem with uninitialized member variables,
	   please see Examples/php4/sync/README for details.

	   Also more PHP documentation added to Doc/Manual/Php.html

01/27/2002:beazley
           The ANSI C size_t type is now recognized as an integer by default.

01/26/2002:beazley
           long long and unsigned long long support added to many language modules.
           This is not a portable feature and will require compiler support
           for the long long type.  In target languages that do not support
           long long (e.g., Tcl and Perl), numbers are converted to a string
           of digits.  This prevents their use in arithmetic calculations, but
           still allows values to be set from a string.  

           long long support requires the use of the strtoll() and strtoull()
           functions as well as the 'lld' and 'llu' format specifiers
           of sprintf().

01/26/2002:beazley
           Fixed [ #501827 ] Delete method is not called.   The Tcl
           module wasn't correctly calling destructors when they
           were defined using %addmethods.  This has been fixed.
           Reported by Reinhard Fobbe.

01/26/2002: beazley
           Better support for long long and unsigned long long.  Typemaps
           have been included in a number of modules for handling these types.
           In addition, the parser has been modified to accept long long
           literals such as 1234LL and 1234ULL.

01/27/2002: cheetah (william fulton)
           [Java] A C char[] is mapped to a Java String which is the default 
           SWIG handling of char[] and char*. It used to be mapped to byte[]. 
           Note that a C signed char[] array is mapped to byte[].

           *** POTENTIAL INCOMPATIBILITY ***

01/25/2002: beazley
           Fixed a problem with return-by-value, C++, and
           objects that define no default constructor.
           Reported by Joel Reed.

01/25/2002: cheetah (william fulton)
           [Java] Overhaul of the Java module. The C code generation is now 
           done from typemaps.

01/24/2002: cheetah (william fulton)
           [Java] Support for arrays of enum pointers

01/20/2002: cheetah (william fulton)
           [Java] Error checking for null Java objects being passed to native 
           functions.  Exception thrown now whereas before the JVM crashed.

01/18/2002: cheetah (william fulton)
           [Java] Corrected behaviour for functions that take arrays. For 
           example, when this c function: 

           void arrayfn(int array[]);
           
           is wrapped the corresponding native function

           public final static native void arrayfn(int[] array);

           is produced. Previously if the C function made any changes to the 
           array elements, these were not reflected back into the Java array. 
           This has now been corrected so that the changes are propogated back
           to Java and the calling function will see these changes. This is 
           how pure Java functions work, ie arrays are passed by reference.

01/15/2002:mkoeppe
           [Guile] New file cplusplus.i with C++ typemaps contributed
           by Marcio Luis Teixeira <marciot@holly.colostate.edu>.

01/11/2002: cheetah (william fulton)
           [Java] Changed mapping of C long to Java type. Was mapped to Java
           long, now mapped to Java int. If you want the previous mapping to 
           Java long use this approach in your interface file:
           
             %clear long;
             %typemap(jni) long             "jlong"
             %typemap(jtype) long           "long"
             %typemap(jstype) long          "long"

             %clear long[ANY];
             %typemap(jni) long[ANY]        "jlongArray"
             %typemap(jtype) long[ANY]      "long[]"
             %typemap(jstype) long[ANY]     "long[]"
             %typemap(in) long[ANY]         {write me for array support}
             %typemap(out) long[ANY]        {write me for array support}
             %typemap(argout) long[ANY]     {write me for array support}
             %typemap(freearg) long[ANY]    {write me for array support}

           *** POTENTIAL INCOMPATIBILITY ***

           This new mapping is more appropriate when interfacing to 32 bit 
           applications which are used in the current 32-bit JVMs. For future 
           64-bit JVMs you may have to change these mappings - eg on Unix LP64 
           systems, but not on Microsoft 64bit Windows which will be using a 
           P64 IL32 model. This may be automated in a future version of SWIG.

01/10/2002:beazley
           Fixed [ 501677 ] %init block in wrong place. Reported
           by Luigi Ballabio.

01/09/2002: cheetah (william fulton)
           [Java] Default support for the long long type. signed long long is 
           mapped to a Java long. unsigned long long is mapped to BigInteger.

01/09/2002:beazley
           Experimental change to parser to better support mixing of
           int, long, short, unsigned, float, and double.   The parser
           should now support types like this:
    
                short unsigned int
                int   unsigned short
                unsigned short int
                unsigned int short

            This change also enables a type of 'long double' (previously
            unsupported) to be used.
            *** NEW FEATURE ***

01/05/2002: cheetah (william fulton)
           [Java] Casting fix for when function return type is a pointer as 
           reported by Gary Pennington 2002-01-05. The upper 32bits of the 
           64 bit jlong will have contained junk for 32bit pointers.

01/05/2002: cheetah (william fulton)
           [Java] Better pointer handling in Java is possible as the 
           INPUT, OUTPUT and INOUT typemaps have been added into typemaps.i.

01/05/2002: cheetah (william fulton)
           [Java] $null can be used in input typemaps to return early from JNI 
           functions that have either void or a non-void return type. Example:

             %typemap(check) int * %{ 
               if (error) {
                 SWIG_exception(SWIG_IndexError, "Array element error");
                 return $null;
               }
             %}

           If the typemap gets put into a function with void as return, $null 
           will expand to nothing:

             void jni_fn(...) {
                 if (error) {
                   SWIG_exception(SWIG_IndexError, "Array element error");
                   return ;
                 }
               ...
             }

           otherwise $null expands to zero, where javareturntype is either a 
           pointer or a primitive type:

             javareturntype jni_fn(...) {
                 if (error) {
                   SWIG_exception(SWIG_IndexError, "Array element error");
                   return 0;
                 }
               ...
             }

01/02/2002: cheetah (william fulton)
           [Java] The Java module incorrectly used argout typemaps for 
           strings. This is now corrected and the code now resides
           in the freearg typemap. The argout array typemaps have been split into 
           argout and freearg typemaps. This correction may require some user 
           written typemaps to be modified. 
           *** POTENTIAL INCOMPATIBILITY ***

12/28/2001: cheetah (william fulton)
           [Java] Multi typemaps now working for Java see multimap example.
           [Java] Fix for recently introduced bug - freearg typemap code was appearing
           before the function call.

12/28/2001: cheetah (william fulton)
           [Java] JCALL macro for JNI calls that work in both C and C++ typemaps
           have been replaced with JCALL0, JCALL1, JCALL2, JCALL3 and JCALL4 
           macros.
           *** POTENTIAL INCOMPATIBILITY ***

12/22/2001:beazley
           Resolved some inconsistent behavior with %rename and class renaming.
           If you specify the following:
 
               %rename(Foo)  Bar;

               class Bar {
               public:
                    Bar();
                    ~Bar();
               }

           Then the %rename directive applies to the class itself, the constructor,
           and the destructor (all will be renamed to Foo).

           If a class defines more than one constructor, the overloaded variants
           can still be renamed by specifying parameters to %rename.  For example:

               %rename(Bar_copy) Bar(Bar &);
               class Bar {
               public:
                     Bar();
                     Bar(Bar &);
                    ~Bar();
               };

           There are still some odd corner cases.  If you specify

               %rename(Foo) ::Bar;

           then only the name of the class is changed and the constructor/destructor
           names are left unmodified.  If you specify 

               %rename(Foo) *::Bar;

           then the names of the constructor/destructor functions are modified but
           the name of the class is not.

12/21/2001: cheetah (william fulton)
           [Java] jni, jtype and jstype typemaps no longer hardcoded but real 
           typemaps. New variable substitution, $javaclassname, can be used in
           the jstype typemaps. It is replaced with the Java shadow class name
           where applicable.
           [Java] Fix for recently introduced bug to do with inheritance when 
           using %import.
           [Java] A few more bug fixes, todo with %rename and using the kind
           with the type, eg 
           void fn(union uni myuni, struct str mystr, class cl mycl);

12/20/2001:beazley
           Fixed [ #494524 ] Preprocessor bug - apostrophe and #subst.

12/20/2001:beazley
           Added SWIG_VERSION preprocessor symbol.   This is a hexadecimal
           integer such as 0x010311 (corresponding to SWIG-1.3.11).  This can
           be used in the interface as follows:

               #if SWIG_VERSION >= 0x010311
               /* Use some fancy new feature */
               #endif

           Note: The version symbol is not defined in the generated SWIG
           wrapper file.

           *** NEW FEATURE ***

12/20/2001:mkoeppe
	   [MzScheme]: Renamed mzswig_make_boolean to
	   swig_make_boolean, as the latter is used in the typemaps.
	   Reported by Luigi Ballabio.

12/17/2001:mkoeppe
	   [Guile]: Rewrote list-vector.i using multi-dispatch
	   typemaps.  Updated pointer-in-out.i.  Make the
	   deprecated typemap-substitution of "$source" in "argout"
	   work as before.

12/16/2001:mkoeppe
	   [Guile]: Fixed macros %values_as_list, %values_as_vector,
	   %multiple_values to use the proper %pragma syntax.  New
	   Guile example/test "multivalue"; new Guile run-test for
	   test-suite item "list-vector" (currently broken).

12/14/2001:mkoeppe
	   [Guile]: Fixed typemap-substition bug for "varin".  Relaxed
	   valid-identifier check to allow all R5RS identifiers.


Version 1.3.10 (December 10, 2001)
==================================

12/08/2001:beazley
           Modified %typemap so that %{ ... %} can also be used as a
           code block (mostly for completeness).  For example:
 
              %typemap(in) blah %{
                 ...
              %}

           This form does not introduce a new block scope.  Also, the
           code enclosed in %{ ... %} is not processed by the preprocessor.

12/08/2001:beazley
           Fixed [ #459614 ] SWIG with multiple TCL interpreters.

12/08/2001:beazley
           Fixed [ #417141 ] rubydec.swg is wrong
           Reported by Paul Brannan.

12/08/2001:beazley
           Fixed [ #410557 ] Problem with %addmethods on NT.
           Reported by Magnus Ljung.

12/08/2001:beazley
           Fixed [ #445233 ] Enhancement: handle access change.
           SWIG now parses (but ignores) C++ access changes for the
           the following:

             class A {
             protected:
                void something() { }
             public:
                A() {}
             };

             class B : private A {
             public:
                B() : A() { }
             protected:
                A::something;    <---- Parsed, but ignored
             };
 
           Suggested by Krzysztof Kozminski.

12/08/2001: cheetah (william fulton)
           Fix for Ruby to work using Visual C++.

12/06/2001:beazley
           Fixed [ #465687 ] unsigned short parameters fail.
           Reported by Gerald Williams.

12/06/2001:beazley
           Fixed SF [ #489594 ] PyString_FromString can't take NULL arg.
           Reported by John Merritt.   SWIG now converts string values
           to Python using code like this:

           resultobj = result ? PyString_FromString(result) : Py_BuildValue("");

12/06/2001:beazley
           Fixed SF [ #463561 ] Type conversions not generated.
           Reported by Gerald Williams.
	
12/04/2001:beazley
           Fixed SF [ #470217 ] Tcl default argument handling.
           Reported by Shaun Lowry.

12/04/2001:beazley
           Fixed SF [ #472088 ] defined(MACRO) expanded everywhere.
           Embedded preprocessor directives such as

              %#if defined(FOO)

           are not expanded by the SWIG preprocessor.
           Reported by Gerald Williams.

12/04/2001:beazley
           Fixed SF [ #476467 ] Problems with #define & commas.

12/04/2001:beazley
           Fixed SF [ #477547 ] wrong declaration of pointer functions.
           Bad prototypes in Lib/tcl/ptrlang.i.

12/04/2001:beazley
           Fixed SF [ #483182 ] Constants can take args by mistake. 
           When swig -perl5 -const is used, constants are declared
           with a void prototype.  For example:

                sub ICONST () { $examplec::ICONST }

           Patch submitted by Rich Wales.

12/03/2001:beazley
           New %exception directive.   This is intended to replace %except.
           It works in exactly the same manner except it does not accept a 
           language specifier. For example:

               %exception {
                   try {
                      $action
                   } 
                   catch(SomeError) {
                       error
                   }
               }

           %exception is also name aware---allowing it to be applied to
           specific declarations in an interface.  For example:

              %exception foo {
                  ...
                  exception for any function/method foo
                  ...
              }

              %exception Foo::bar {
                  ...
                  exception for method bar in class Foo
                  ...
              }
 
              %exception Foo::bar(double) {
                  ...
                  exception for method bar(double) in class Foo
                  ...
              }

           The semantics of this name matching is exactly the same as for %rename.
           *** NEW FEATURE ***
           
12/03/2001:beazley
           Substantial cleanup of the Python shadow class code.  Shadow classes
           used to be created in this rather complicated manner involving about
           a half-dozen strings created in bits and pieces.   Shadow classes
           are now generated in a more straightforward manner--in the same
           order that appears in the interface file.

           *** POTENTIAL INCOMPATIBILITY ***
           The order in which declarations appear in the shadow file may differ.
           
12/03/2001:beazley
           The %insert directive (%{ ... %}, %runtime, %header, %wrapper, etc.)
           can now be used inside of a class definition.   This has potential
           uses when generating shadow class code.  For example:

                 class Foo {
                     ...
                 %insert("shadow") %{
                 # Some python code
                 def blah(self):
                      print "I'm blah!"
                 %}
                     ...
                 };

           The support for class code insertion depends on the language module.
           However, the intent of this feature is to simplify the task of extending
           shadow class code.   In the Python module, this inserts code with the
           proper level of indendation (regardless of what was used in the SWIG
           interface).
           *** NEW FEATURE ***

11/29/2001: cheetah (william fulton)
           Modifications for Java and Python modules to work on cygwin.
           Unfortunately a lot of the python module has started to produces code 
           which cannot be auto-imported using cygwin libtools so most of it is 
           still broken.

11/28/2001:beazley
           The %rename and %feature directive can now be used inside
           of a class definition. For example:

             class Foo {
                 %rename(foo_i) foo(int);
                 %rename(foo_d) foo(double);
             public:
                 ...
                 void foo(int);
                 void foo(double);
                 ...
             };

           When used in this manner, the %rename directive only applies
           to members of the class in which it appears as well as all
           derived classes.  In fact, this is really just the same
           as saying:

             %rename(foo_i) Foo::foo(int);
             %rename(foo_d) Foo::foo(double);
             class Foo {
                ...
             };

           *** NEW FEATURE ***

11/26/2001:beazley
           Added the experimental %feature directive.  %feature can be
           used to attach arbitrary string attributes to parse tree nodes.
           For example:

               %feature("except") blah {
                   try {
                      $function
                   } catch (Error) {
                       whatever;      
                   }
               }

           or

              %feature("set") *::x_set "x";

           or

              %feature("blah") Foo::bar(int,double) const "spam";

           The syntax is borrowed from the %rename directive.  In fact, the
           exact same semantics apply (inheritance, matching, etc.).

           %feature is a very powerful low-level primitive that can be used to
           customize individual language modules and to provide hints to 
           any stage of code generation.   Features are attached to
           parse tree nodes as attributes with names like "feature:*" where * 
           is replaced by the feature name (e.g., "feature:except", "feature:set", 
           etc.).   Language modules can then look for the features using 
           a simple attribute lookup.

           %feature is intended to be a replacement for a number of
           older SWIG directives including %except and specialized
           pragmas. It is more powerful (due to its parameterized
           name matching) and it provides very precise control over
           how customization features are attached to individual
           declarations.   There are future expansion plans that will
           build upon this capability as well.

           It's not certain that %feature will ever be used directly
           by SWIG users.  Instead, it may be a low-level primitive
           that is used in high-level macro definitions.  For instance,
           to support properties, you might define a macro like this:

           %define %property(name, setf, getf)
           %feature("set") setf #name;
           %feature("get") getf #name;
           %enddef

           Which allows a user to specify things like this:

           %property(p, get_p, set_p);

           class Blah {
           public:
              int  get_p();
              void set_p(int);
           };

           *** EXPERIMENTAL NEW FEATURE ***
  
11/24/2001:beazley
           The Tcl module has been expanded with some new features for
           managing object ownership.  For example:
         
                set c [Circle -args 20]
                $c area             # Invoke a method
                $c -disown          # Releases ownership of the object
                $c -acquire         # Acquires ownership of the object

           If Tcl owns the object, its destructor is invoked when the 
           corresponding object command is deleted in Tcl.  

           To simplify the destruction of objects, the following syntax
           can be used:

                $c -delete         # Delete an object

           This is an alternative for the more obscure variant of 

                rename $c {}

           These features also add functionality at the C API level.
           The following functions manage ownership from C and
           can be used in typemaps.

                SWIG_Acquire(void *ptr);
                SWIG_Disown(void *ptr);

           A new function for constructing instances is also available:

                Tcl_Obj *
                SWIG_NewInstanceObj(Tcl_Interp *interp, void *ptr,
                                    swig_type_info *type, int own);

           When used in a typemap, this creates a pointer object and
           an interpreter command that can be used to issue methods and
           access attributes as shown above.
           *** NEW FEATURE ***
           
11/23/2001:beazley
           All Python-related %pragma operations have been eliminated.
           Most of these were written for older SWIG versions in order to
           compensate for limitations in earlier releases.  In an effort
           to reduce the amount of code-clutter and potential for errors,
           it is easier to simply eliminate the pragmas and to start over
           (if needed).  To be honest, I'm not even sure the pragmas
           worked in 1.3.9 and recent releases.

           Note: If you need to insert code into the shadow class file
           created by SWIG, simply use the %shadow directive like this:

              %shadow %{
              def some_python_code():         
                  print "blah!"
              %}

           *** POTENTIAL INCOMPATIBILITY ***

11/22/2001:beazley
           Sweeping changes to the way in which the Python module handles
           shadow classes.   In early implementations, shadow classes were
           merely Python wrappers around typed pointer objects. However, 
           some users actually wanted to receive the shadow class object in C.
           To accomodate this, the dereferencing of the "this" pointer in
           a shadow class was moved to C as described in CHANGES [8/8/99].
           However, the process of returning pointers to Python was still
           somewhat problematic.  Specifically, shadow classes never worked
           in situations such as these:

             -   Use of any kind of output typemap ('out' or 'argout')
             -   Global variables (broken as far as I can tell).

           In the past, some users have dealt with this by manually trying
           to create shadow class objects themselves from C/C++.  However,
           this was difficult because the C wrappers don't really know how
           to get access to the corresponding Python class.

           The Python module has now been modified to automatically attach
           shadow class objects to pointers when they are returned to 
           Python.   This process occurs in the function SWIG_NewPointerObj()
           so the process is completely transparent to users.    As a result,
           shadow classes are now more seamlessly integrated with typemaps
           and other features of SWIG.

           This change may introduce a number of incompatibilities.  The
           SWIG_NewPointerObj() now takes an extra parameter "own" to 
           indicate object ownership.   This can be used to return a pointer
           to Python that Python should destroy.   In addition, older code
           that tries to manually construct shadow class objects or which
           expects bare pointers may break---such pointers may already be
           encapsulated by a shadow class.
           *** POTENTIAL INCOMPATIBILITY ***

11/20/2001:beazley
           Modified the %insert directive to accept single braces { ... }.
           For example:

                %insert("header") {
                   ... some code ...
                }

           This works exactly like %{ ... %} except that the code in the
           braces is processed using the preprocessor.   This can be useful
           in certain contexts such as low-level code generation in 
           language modules.
           *** NEW FEATURE ***
           
11/20/2001:beazley
           Command line options are now translated into preprocessor
           symbols.  For example:
	
              ./swig -python -shadow -module blah interface.i

           Creates the symbols:

              SWIGOPT_PYTHON 1
              SWIGOPT_SHADOW 1
              SWIGOPT_MODULE blah
              
           Modules can look for these symbols to alter their code generation
           if needed.
           *** NEW FEATURE ***
             
11/20/2001:beazley
           Massive overhaul of the Perl5 module.  A lot of code generation is
           now driven by tables and typemaps.   The generated wrapper code 
           also makes use of tables to install constants, variables, and
           functions instead of inlining a bunch of procedure calls.  The
           separate variable initialization function is gone.   Most
           code generation is controlled via the perl5.swg file in the
           library.
           *** POTENTIAL INCOMPATIBILITY ***
           
11/13/2001:beazley
           Added parsing support for the C++ typename keyword.  Primarily this
           is added to better support templates.  For example:

             template<typename T> void  blah(C& v) {
                 typename C::iterator i = v.begin();
             }

           Note: typename is supported in the parser in the same way as 'struct'
           or 'class'.  You probably shouldn't use it anywhere except in templates.
           *** NEW FEATURE ***

11/11/2001:beazley
           Massive overhaul of the language module API.   Most functions now
           use a common, very simple,  API.   There are also a number of
           interesting semantic side-effects of how code is actually generated.
           Details will be forthcoming in Doc/Manual/Extending.html.

           *** POTENTIAL INCOMPATIBILITY *** Language modules written for
           previous versions of SWIG will no longer work,

11/10/2001:beazley
           Fixed a very subtle bug due to unnamed class wrapping. For example, if
           you did this

              typedef struct {
                  int x,y;
              } gdPoint, *gdPointPtr;

              void foo(gdPointPtr x);

           Then the foo function would get a type-error.   The problem has
           to do with internal typedef handling and the fact that the typedef
           declarations after the struct appear later in the parse tree.
           It should work now.  Problem reported by Vin Jovanovic.

11/09/2001:beazley
           Subtle change to "out" typemaps (and related variations).  The name
           that is attached to the typemap is now the raw C identifier that
           appears on a declaration.  This changes the behavior of
           member functions.  For example:

               %typemap(out) int foo {
                  ...
               }

               class Blah {
                   public:
                      int foo();    // typemap gets applied
               }
            
           Previous versions never really specified how this was supposed to
           work.  In SWIG1.1, you could probably write a typemap for the
           wrapper name like this:

                %typemap(out) int Blah_foo { ... }

           However, this old behavior is now withdrawn and not supported. 
           Just use the member name without any sort of special prefix.
           *** POTENTIAL INCOMPATIBILITY ***

11/06/2001:beazley
           Changes to Tcl module initialization:

           (1) SWIG now automatically includes the code needed to work with
                Tcl stubs.  Simply compile with -DUSE_TCL_STUBS.

           (2) SWIG now automatically calls Tcl_PkgProvide to register
               a package name.  The package name is the same as the name
               specified with the %module directive.  The version number is
               set to "0.0" by default.  To change the version number, use
               swig -pkgversion 1.2 interface.i.

           *** POTENTIAL INCOMPATIBILITY ***
           Modules that provided stubs and Tcl_PkgProvide on their own might
           break.  Simply remove that code.

11/05/2001:beazley
           Changed code generation of constants in the Tcl module.  Constants
           are now stored in a large table that get installed at module startup.
           There are also no longer any static variables so it should generate
           somewhat less code.

11/04/2001:beazley
           The "const" typemap has been renamed to "constant" in many language
           modules.  "const" is a C keyword which made the handling of the typemap
           directive somewhat awkward in the parser.
           *** POTENTIAL INCOMPATIBILITY ***

11/04/2001:beazley
           %typemap directive can now accept nearly arbitrary keyword parameters.
           For example:

              %typemap(in,parse="i",doc="integer") int "...";

           The purpose of the keyword parameters is to supply code generation
           hints to the target language module.   The intepretation of the
           parameters is language specific.
           *** NEW FEATURE ***

11/04/2001:beazley
           Slight semantic change to internal call/return by value handling.
           In previous versions of SWIG, call-by-value was translated
           into pointers.  For example:

               double dot_product(Vector a, Vector b);

           turned into this:

               double wrap_dot_product(Vector *a, Vector *b) {
                  return dot_product(*a,*b);
               }

           This translation was normally performed by the SWIG core, outside
           of the control of language modules.  However, a side effect
           of this was a lot of bizarre typemap behavior.   For example,
           if you did something like this:

                %typemap(in) int32 {
                    ...
                }

           You would find that int32 was transformed into a pointer everywhere!
           (needless to say, such behavior is unexpected and quite awkward to
           deal with).  To make matters worse, if a typedef was also used,
           the pointer behavior suddenly disappeared.

           To fix this, the pointer transformation is now pushed to the
           language modules.   This produces wrappers that look roughly
           like this:

               double wrap_dot_product(Vector *a, Vector *b) {
                  Vector arg1 = *a;
                  Vector arg2 = *b;
                  return dot_product(arg1,arg2);
               }

           This change also makes it easy to define typemaps for
           arbitrary undefined types.  For example, you can do this (and it
           will work regardless what int32 is):

               %typemap(in) int32 {
                  $1 = (int32) PyInt_AsLong($input);
               }

           *** POTENTIAL IMCOMPATIBILITY ***
           This change may break call/return by value code generation in
           some language modules.

11/03/2001:beazley
           Changed the name of the default typemaps to the following:

               %typemap() SWIGTYPE  { 
                   ... an object ...
               }
               %typemap() SWIGTYPE * {
                   ... a pointer ...
               }
               %typemap() SWIGTYPE & {
                   ... a reference ...
               }
               %typemap() SWIGTYPE [] {
                   ... an array ...
               }
               %typemap() enum SWIGTYPE {
                  ... an enum value ...
               }
               %typemap() SWIGTYPE (CLASS::*) {
                   ... pointer to member ...
               }


           These types are used as the default for all types that don't match
           anything else.  See CHANGES log entry for 8/27/2000 for the
           old behavior.  The role of these types is also described in 
           Doc/Manual/Typemaps.html

           *** POTENTIAL INCOMPATIBILITY ***
          
10/25/2001:beazley
           Modified Guile and Mzscheme modules to support
           multi-argument typemaps.

10/25/2001: cheetah (william fulton)
           [Java] Fix to handle pointers to arrays.

10/24/2001:beazley
           Defining a typemap rule for enum SWIGENUM can now be used
           to define default behavior for enum variables.

10/22/2001:beazley
           Ruby module modified to support multi-argument typemaps.

10/22/2001:beazley
           The Ruby module can now handle functions with an arbitrary
           number of arguments.  Previous versions were limited to 
           to functions with only 9 or 16 arguments depending on
           the use of default arguments.   Note: from some inspection
           of the Ruby interpreter source, the new approach might be
           a little faster as well.

10/18/2001:beazley
           Fixed a bug with forward class declarations and
           templates.

                 class Foo <S,T>;

           Bug reported by Irina Kotlova.

10/16/2001:beazley
           Support for multivalued typemaps added.  The typemaps
           are specified using the syntax below.   Within each
           typemap, variable substitution is handled as follows:

              %typemap(in) (int argc, char *argv[]) {
                  $arg;  // The input object in the target language
                  $1;    // C local variable for first argument
                  $2;    // C local variable for second argument

                  // These variables refer to either argument
                  $1_type, $1_ltype, $1_basetype, etc...  (argc)
                  $2_type, $2_ltype, $2_basetype, etc...  (argv[])

                  // Array dimension of argv
                  $2_dim0
              }

           Basically any variable that was available in normal typemaps
           is available for either argument by prefacing the variable
           name by '$n_' where n is the argument position.

           Notes:  
           (1) Multi-valued typemaps can only be applied to a single
               object in the target scripting language.   For example,
               you can split a string into a (char *, int) pair or
               split a list into a (int, char []) pair.  It is not
               possible to map multiple objects to multiple arguments.

           (2) To maintain compatibility with older SWIG versions, the
               variables such as $target and $type are preserved and
               are mapped onto the first argument only.

           (3) This should not affect compatibility with older code.
               Multi-valued typemaps are an extension to typemap handling.
               Single valued typemaps can be specified in the usual
               way.

           The old $source and $target variables are officially
           deprecated.  Input variables are referenced through
           $arg$ and output values are reference through $result$.

           *** NEW FEATURE ***

10/16/2001:beazley
           Added parsing support for multivalued typemaps.  The syntax
           is a little funky, but here goes:

              // Define a multivalued typemap
              %typemap(in) (int argc, char *argv[]) {
                    ... typemap code ...
              }

              // Multivalued typemap with locals
              %typemap(in) (int argc, char *argv[])(int temp) {
                    ... typemap code ...
              }
              
              // Copy a multivalued typemap
              %typemap(in) (int argcount, char **argv) = (int argc, char *argv[]);

              // Apply a multivalued typemap
              %apply (int argc, char *argv[]) { (int argcount, char **argv) };

           Note: this extra parsing support is added for future extension.
           No language modules currently support multi-valued typemaps.

10/11/2001:beazley
           Modified the typemap matching code to discard qualifiers when
           checking for a match.   For example, if you have a declaration
           like this:

                 void blah(const char *x);

           The typemap checker checks for a match in the following order:

                 const char *x
                 const char *
                 char *x
                 char *

           If typedef's are involved, qualifier stripping occurs before
           typedef resolution.  So if you had this,

                typedef char *string;
                void blah(const string x);

           typemap checking would be as follows:

                const string x
                const string
                string x
                string
                const char *x
                const char *
                char *x
                char *

           The primary reason for this change is to simplify the implementation
           of language modules.  Without qualifier stripping, one has to write
           seperate typemaps for all variations of const and volatile (which
           is a pain).

           *** POTENTIAL INCOMPATIBILITY ***  Typemaps might be applied in
           places where they weren't before.


10/9/2001: beazley
           SWIG now generates wrappers that properly disambiguate
           overloaded methods that only vary in constness.  For
           example:

               class Foo {
                  ...
                  void blah();
                  void blah() const;
                  ...
               };

           To handle this, the %rename directive can be used normally.
           
               %rename(blah_const) blah() const;

           In the resulting wrapper code, method calls like this
           are now generated:

               (obj)->blah()               // Non-const version
               ((Foo const *)obj)->blah()  // const version

           This should force the right method to be invoked.
           Admittedly, this is probably obscure, but we might
           as well get it right.

10/8/2001: beazley
           The preprocessor now ignores '\r' in the input.
           This should fix the following bug:
           [ #468416 ] SWIG thinks macro defs are declarations?

10/8/2001: beazley
           Added support for ||, &&, and ! in constants.  This
           fixes SF [ #468988 ] Logical ops break preprocessor.
           However, at this time, constants using these operators
           are not supported (the parser will issue a warning).

10/4/2001: beazley
           Added -show_templates command line option.  This makes
           SWIG display the code it actually parses to generate
           template wrappers.  Mostly useful for debugging.
           *** NEW FEATURE ***

10/4/2001: beazley
           Change to semantics of %template directive.  When
           using %template, the template arguments are handled
           as types by default.  For example:

                %template(vecint) vector<int>;
                %template(vecdouble) vector<double>;

           To specify a template argument that is *not* a type, you
           need to use default-value syntax. For example:

                %template(vecint) vector<int,int=50>;
                %template(vecdouble) vector<int,size=100>;

           In this case, the type name doesn't really matter--only
           the default value (e.g., 50, 100) is used during
           expansion.  This differs from normal C++, but I couldn't
           figure out a better way to do it in the parser.  Might
           implement an alternative later.
           *** POTENTIAL INCOMPATIBILITY ***
       
10/4/2001: beazley
           Major changes to template handling in order to provide
           better integration with the C++ type-system. The main
           problem is as follows:

           Suppose you have a template like this:

              template<class T> void blah(const T x) { stuff };
                   
           Now suppose, that you instantiate the template on a
           type like this in SWIG:

              %template(blahint) blah<int *>;

           In C++, this is *supposed* to generate code like this:

              void blah(int *const x) { stuff };

           However, in SWIG-1.3.9, the template substitution gets it wrong
           and produces

              void blah(const int *x) { stuff };

           (notice the bad placement of the 'const' qualifier).

           To fix this, the SWIG parser now generates implicit typedefs
           for template type arguments that produces code roughly
           equivalent to doing this:

              typedef int *__swigtmpl1;
              %template(blahint) blah<__swigtmpl1>;

           which generates code like this:

              void blah(const __swigtmpl1 x) { stuff };

           Since this is correct in both C++ and SWIG, it provides the right
           semantics and allows everything to compile properly.  However,
           to clean up the generated code a little bit, the parser keeps
           track of the template types and performs back-substitution to
           the original type when building the parse tree.  Thus, even
           though the implicit typedef is used in the input and may appear
           in the generated wrapper file (for proper compilation), the parse
           tree will hide a lot of these details.   For example:

              void blah(const __swigtmpl1 x) { stuff };

           will look like it was declared as follows (which is what
           you want):

              void blah(int *const x) { stuff }

           The only place you are likely to notice the typedef hack
           is in bodies of template functions.  For example, if you
           did this,

              template<class T> class blah {
                   ...
                   %addmethods {
                       void spam() {
                          T  tempvalue;
                          ...
                       }
                   }
              }

           you will find that 'T tempvalue' got expanded into some
           strange typedef type.  This *still* compiles correctly 
           so it's not a big deal (other than looking kind of ugly
           in the wrapper file).

10/4/2001: beazley
           Fixed some inheritance problems in Tcl Object interface.

10/1/2001: beazley
           Tcl module has changed to use byte-backed pointer strings.  This
           implementation should be safe on 64-bit platforms.  However,
           the order in which digits appear in pointer values no longer
           directly corresponds to the actual numerical value of a
           pointer (on little-endian machines, pairs of digits appear
           in reverse order).

10/1/2001: beazley
           Perl5 module is now driven by a configuration file 'perl5.swg'
           in the SWIG library.

10/1/2001: beazley
           The perl5 module no longer tries to apply the "out" typemap
           in code generated for magic variables.  I'm surprised that
           this ever worked at all (since all of the code that was there
           was wrong anyways).   Use the "varout" typemap to handle
           global variables.

10/1/2001: beazley
           Fixed a bug related to character array members of structures.
           For example:

                struct Foo {
                   char name[32];
                };

           SWIG is normally supposed to return a string, but this was
           broken in 1.3.9.   The reason it was broken was actually
           due to a subtle new feature of typemaps.  When a data member
           is set to an array like this, the return type of the related
           accessor function is actually set to an array.  This means
           that you can now write typemaps like this:

              %typemap(python,out) char [ANY] {
                 $target = PyString_FromStringAndSize($source,$dim0);
              }

           This functionality can be used to replace the defunct
           memberout typemap in a more elegant manner.

9/29/2001: beazley
           Some further refinement of qualified C++ member functions.
           For example:

               class Foo {
                  ...
                  void foo() const;
                  ...
               };

           (i) The SWIG parser was extended slightly to allow 'volatile'
           and combinations of 'const' and 'volatile' to be used.  This
           is probably rare, but technically legal.  Only added for
           completeness.

           (ii) For the purposes of overloading, qualified and non-qualified
           functions are different.  Thus, when a class has methods like this:

                 void foo();
                 void foo() const;

           Two distinct methods are declared.  To deal with this, %rename
           and similar directives have been extended to recognize const.
           Thus, one can disambiguate the two functions like this:

                %rename(fooconst) Foo::foo() const;

           or simply ignore the const variant like this:

                %ignore Foo::foo() const;

           Note: SWIG currently has no way to actually invoke the const
           member since the 'const' is discarded when generating wrappers
           for objects.  

9/27/2001: beazley
           New directive. %namewarn can be used to issue warning
           messages for certain declaration names.   The name
           matching is the same as for the %rename directive.
           The intent of this directive is to issue warnings for
           possible namespace conflicts.  For example:

              %namewarn("print is a python keyword") print;

           The name matching algorithm is performed after a name
           has been resolved using %rename.  Therefore, a
           declaration like this will not generate a warning:

              %rename("Print") print;
              ...
              void print();    /* No warning generated */

           Since the warning mechanism follows %rename semantics, it is
           also to issue warnings for specific classes or just for
           certain member function names.

           (Dave - I've been thinking about adding something like this
           for quite some time.  Just never got around to it)
           *** NEW FEATURE ***


9/27/2001: beazley
           Enhanced the %ignore directive so that warning messages
           can be issued to users.   This is done using %ignorewarn
           like this:

             %ignorewarn("operator new ignored") operator new;

           The names and semantics of %ignorewarn is exactly the 
           same as %ignore. The primary purpose of this directive
           is for module writers who want to ignore certain types
           of declarations, but who also want to alert users about it.
           A user might also use this for debugging (since messages
           will appear whenever an ignored declaration appears).
           *** NEW FEATURE ***

9/26/2001: beazley
           Super-experimental support for overloaded operators. 
           This implementation consists of a few different parts.

           (i) Operator names such as 'operator+' are now allowed
           as valid declarator names.  Thus the 'operator' syntax
           can appear *anyplace* a normal declarator name was used
           before.  On the surface, this means that operators can
           be parsed just like normal functions and methods. 
           However, it also means that operator names can be used
           in many other SWIG directives like %rename.  For example:

            %rename(__add__) Complex::operator+(const Complex &);

           (ii) Operators are wrapped *exactly* like normal functions
           and methods.  Internally, the operator name is used 
           directly meaning that the wrapper code might contain
           statements like this:

                arg0->operator*((Complex const &)*arg1);

           This all seems to parse and compile correctly (at least
           on my machine).

           (iii) SWIG will no longer wrap a declaration if its symbol
           table name contains illegal identifier characters.  If
           illegal characters are detected, you will see an error
           like this:
 
                Warning. Can't wrap operator* unless renamed to a valid identifier.

           The only way to fix this is to use %rename or %name to bind
           the operator to a nice name like "add" or something. Note:
           the legal identifier characters are determined by the target
           language.

           There are certain issues with friend functions and operators.
           Sometimes, friends are used to define mixed operators such
           as adding a Complex and a double together.  Currently, SWIG
           ignores all friend declarations in a class.  A global operator
           declaration can probably be made to work, but you'll have to
           rename it and it probably won't work very cleanly in the
           target language since it's not a class member.

           SWIG doesn't know how to handle operator specifications 
           sometimes used for automatic type conversion. For example:

           class String {
              ...
              operator const char*();
              ...
           };

           (this doesn't parse correctly and generates a syntax error).

           Also: operators no longer show up as separate parse-tree
           nodes (instead they are normal 'cdecl' nodes).  I may
           separate them as a special case later.

           See Examples/python/operator for an example.

           *** SUPER-EXPERIMENTAL NEW FEATURE ***

Version 1.3.9 (September 25, 2001)
==================================
9/25/2001: beazley
           Fixed parsing problem with type declarations like 
           'char ** const'.  SWIG parsed this correctly, but the
           internal type was represented incorrectly (the pointers
           and qualifiers were in the wrong order).

9/25/2001: beazley
           Withdrew experimental feature (noted below) that was
           causing serious parsing problems.

Version 1.3.8 (September 23, 2001)
==================================
9/23/2001: beazley
           Included improved distutils setup.py file in the Tools 
           directory (look for the setup.py.tmpl file).  Contributed by
           Tony Seward.

9/23/2001: beazley
           Included two new RPM spec files in the Tools directory. Contributed
           by Tony Seward and Uwe Steinmann.
  
9/21/2001: beazley
           Fixed SF Bug [ #463635 ] Perl5.swg does not compile in Visual C++

9/21/2001: beazley
           Two new directives control the creation of default
           constructors and destructors:

                %nodefault
                %makedefault

           These replace %pragma nodefault and %pragma makedefault.
           (old code will still work, but documentation will only
           describe the new directives).

9/21/2001: beazley
           Fixed SF Bug [ #462354 ] %import broken in 1.3.7.

9/20/2001: beazley

           Parser modified to ignore out-of-class constructor
           and destructor declarations.  For example:

               inline Foo::Foo() :
                    Bar("foo")
               { 
               } 

               inline Foo::~Foo() {
               }

           Suggested by Jason Stewart.
           *** EXPERIMENTAL FEATURE ***

9/20/2001: beazley
           Modified the parser to ignore forward template class
           declarations.  For example:

              template <class V, long S> class MapIter;

           Suggested by an email example from Irina Kotlova.

9/20/2001: beazley
           Fixed problem with undeclared tcl_result variable in 
           the "out" typemap for Tcl.  Reported by Shaun Lowry.

9/20/2001: beazley
           Incorporated changes to make SWIG work with ActivePerl.  
           Contributed by Joel Reed.

9/20/2001: beazley
           Slight change to the parsing of C++ constructor initializers.
           For example:

           class Foo : public Bar {
           public:
                  Foo() : Bar(...) {...}
           };

           SWIG now discards the contents of the (...) regardless of 
           what might enclosed (even if syntactically wrong).  SWIG
           doesn't need this information and there is no reason to
           needless add syntax rules to handle all of the possibilities
           here.

9/20/2001: beazley
           Change to typemaps for structure members.  If you have a
           structure like this:

              struct Vector {
                int *bar;
              };

           The member name 'bar' is now used in any accessor functions.
           This allows the "in" typemap to be used when setting the value.
           For example, this typemap

               %typemap(python,in) int *bar {
                   ...
               }

           now matches Vector::bar.  It should be noted that this will also
           match any function with an argument of "int *bar" (so you should
           be careful).
           *** NEW FEATURE. POTENTIAL INCOMPATIBILITY ***

9/20/2001: beazley
           Fixed SF bug #462642 setting string values in structures

9/20/2001: beazley
           Fixed SF bug #462398 problem with nested templates.

9/20/2001: beazley
           Fixed SF bug #461626 problem with formatting and C++ comments.
            
9/20/2001: beazley
           Fixed SF bug #462845 Wrong ownership of returned objects.
           
9/19/2001: beazley
           Fixed SF bug #459367.  Default constructors for classes
           with pure virtual methods.

9/19/2001: beazley
           Fixed problem with default arguments and class scope.  For
           example:

               class Foo {
               public:
                  enum bar { FOO, BAR };
                  void blah(bar b = FOO);
                  ...
               }

           SWIG now correctly generates a default value of "Foo::FOO" for
           the blah() method above.  This used to work in 1.1, but was
           broken in 1.3.7.   Bug reported by Mike Romberg.

Version 1.3.7  (September 3, 2001)
==================================

9/02/2001: beazley
           Added special %ignore directive to ignore declarations.  This
           feature works exactly like %rename.  For example:

             %ignore  foo;        // Ignore all declarations foo
             %ignore  ::foo;      // Only ignore foo in global scope
             %ignore  Spam::foo;  // Only ignore in class Spam
             %ignore  *::foo;     // Ignore in all classes

           %ignore can also be parameterized.  For example:

             %ignore foo(int);
             %ignore ::foo(int);
             %ignore Spam::foo(int);
             %ignore *::foo(int);

           *** NEW FEATURE ***
            

9/02/2001: cheetah (william fulton)
           [Java] shadowcode pragma modified so that the code that is output 
           in the shadow file is placed relative to where it is placed in the 
           c/c++ code. This allows support for JavaDoc function comments. 

9/01/2001: beazley
           Fixed SF Patch [ #447791 ] Fix for python -interface option.
           Submitted by Tarn Weisner Burton.

9/01/2001: beazley
           SWIG no longer generates default constructors/destructors
           for a class if it only defines a private/protected constructor
           or destructor or if any one of its base classes only has
           private constructors/destructors.  This was reported in
           SF Patch [ #444281 ] nonpublic/default/inhereted ctor/dtor
           by Marcelo Matus.

9/01/2001: beazley
           Added patch to Perl5 module that allows constants to be
           wrapped as constants that don't require the leading $.
           This feature is enabled using the -const option.
           Patch contributed by Rich Wales.
           *** NEW FEATURE ***

8/31/2001: beazley
           Added parsing support for the 'volatile' type qualifier.
           volatile doesn't mean anything to SWIG, but it is
           needed to properly generate prototypes for declarations
           that use it.  It's also been added to make the SWIG type
           system more complete.
           *** NEW FEATURE ***

8/30/2001: beazley
           Added support for parameterized %rename directive.  *** This
           new feature can be used to greatly simplify the task of
           resolving overloaded methods and functions. ***
           
           In prior versions of SWIG, the %rename directive was
           used to consistently apply an identifier renaming. For 
           example, if you said this:

                %rename foo bar;

           Every occurrence of 'foo' would be renamed to 'bar'. 
           Although this works fine for resolving a conflict with a
           target language reserved word, it is useless for
           for dealing with overloaded methods.    This is because
           all methods are simply renamed to the same thing 
           (generating the same conflict as before).

           Therefore, the only way to deal with overloaded methods
           was to go through and individually rename them all using
           %name.  For example:

             class Foo {
             public:
                 virtual void bar(void);
                 %name(bar_i) virtual void bar(int);
                 ...
             };

           To make matters worse, you had to do this for all
           derived classes too.

             class Spam : public Foo {
             public:
                 virtual void bar(void);
                 %name(bar_i) virtual void bar(int);
                 ...
             };

           Needless to say, this makes it extremely hard to resolve
           overloading without a lot of work and makes it almost
           impossible to use SWIG on raw C++ .h files.

           To fix this, %rename now accepts parameter declarators.
           The syntax has also been changed slightly.  For example,
           the following declaration renames all occurrences of 'bar(int)'
           to 'bar_i', leaving any other occurrence of 'bar' alone.

             %rename(bar_i) bar(int);

           Using this feature, you can now selectively rename 
           certain declarations in advance.  For example:

             %rename(bar_i) bar(int);
             %rename(bar_d) bar(double);

             // Include raw C++ header    
             %include "header.h"

           When %rename is used in this manner, all occurrence of bar(int)
           are renamed wherever they might occur.  More control is obtained
           through explicit qualification. For example,

              %rename(bar_i) ::bar(int);

           only applies the renaming if bar(int) is defined in the global scope.
           The declaration,
     
              %rename(bar_i) Foo::bar(int);

           applies the renaming if bar(int) is defined in a class Foo.
           This latter form also supports inheritance.  Therefore, if you
           had a class like this:

               class Spam : public Foo {
               public:
                   void bar(int);
               }

           The Spam::bar(int) method would also be renamed (since Spam 
           is a subclass of Foo).   This latter feature makes it easy
           for SWIG to apply a consistent renaming across an entire
           class hierarchy simply by specifying renaming rules for
           the base class.

           A class wildcard of * can be used if you want to renaming
           all matching members of all classes.  For example:

              %rename(bar_i) *::bar(int);

           will rename all members bar(int) that are defined in classes.
           It will not renamed definitions of bar(int) in the global
           scope.

           The old use of %rename is still supported, but is somewhat
           enhanced.  

              %rename(foo) bar;      // Renames all occurrences of 'bar'.
              %rename(foo) ::bar;    // Rename all 'bar' in global scope only.
              %rename(foo) *::bar;   // Rename all 'bar' in classes only.
              %rename(foo) Foo::bar; // Rename all 'bar' defined in class Foo.

           *** NEW FEATURE ***

8/30/2001: beazley
           Added support for data-member to member-function 
           transformation.  For example, suppose you had a
           structure like this:

                struct Vector {
                    double x,y;
                };

           Now suppose that you wanted to access x and y 
           through a member function interface instead 
           of the usual SWIG behavior. For example:

              f.set_x(3.4)      # instead of f.x = 3.4
              x = f.get_x()     # instead of x = f.x

           To do this, simply use the new %attributefunc
           directive.  For example:

              %attributefunc(get_%s,set_%s)
              struct Vector {
                 double x,y;
              };
              %noattributefunc

           The arguments to %attributefunc are C-style printf
           format strings that determine the naming convention
           to use.  %s is replaced with the actual name of the
           data member. SWIG provides a number of printf
           extensions that might help.  For example, if you
           wanted to title case all of the attributes, you
           could do this:

              %attributefunc(get%(title)s,set%(title)s);

           This will turn an attribute 'bar' to 'getBar()' and 'setBar()'.

           (someone requested this long ago, but I finally figured
           how to implement it in a straightforward manner).
           *** EXPERIMENTAL NEW FEATURE ***
           
8/30/2001: beazley
           SWIG now automatically generates default constructors
           and destructors if none are defined.  This used to be
           enabled with a command line switch -make_default, but
           most people want these functions anyways.  To turn
           off this behavior use the -no_default option or include
           the following pragma in the interface file:
 
                 %pragma no_default;
  
           This may break certain interfaces that defined their
           own constructors/destructors using the same naming
           convention as SWIG.  If so, you will get duplicate
           symbols when compiling the SWIG wrapper file.
           *** POTENTIAL INCOMPATIBILITY ***

8/29/2001: beazley
           Changes to Perl5 shadow class code generation.  Iterators
           are no longer supported (FIRSTKEY, NEXTKEY).  Also, attribute
           access has been changed to rely on inheritance in order
           to provide better behavior across modules.  

8/28/2001: beazley
           Various obscure improvements to the type system and classes.
           Strange declarations like this are now wrapped correctly
           (i.e., the generated wrapper code doesn't cause the C++
            compiler to die with a type error).

            class Foo {
            public:
                 typedef double Real;
                 Real foo(Real (*op)(Real,Real), Real x, Real y);
            };

           Inheritance of types is also handled correctly.
           
8/28/2001: beazley
           Changes to class wrappers.   When SWIG sees two classes like this,
 
           class X {
           public:
             void foo();
             ...
           }
 
           class Y : public X {
           public:
             void bar();
             ...
           }
 
           it now only generates two wrapper functions:
 
             X_foo(X *x) { x->foo(); }
             Y_bar(Y *y) { y->bar(); }
 
           Unlike SWIG1.15, the foo() method does *not* propagate to a wrapper
           function Y_foo(). Instead, the base class method X_foo() must be
           used.

           This change should not affect modules that use shadow classes, but
           it might break modules that directly use the low-level C wrappers.
           This change is being made for a number of reasons:

               -  It greatly simplifies the implementation of SWIG--especially
                  with anticipated future changes such as overloaded methods.

               -  It results in substantially less wrapper code--especially
                  for big C++ class hierarchies (inherited declarations
                  are no longer copied into every single derived class).

               -  It allows for better code generation across multiple
                  SWIG generated modules (code isn't replicated in
                  every single module).

           *** POTENTIAL INCOMPATIBILITY ***                                    

8/22/2001: cheetah (william fulton)
           Provided some Windows documentation in the Win directory and some
           Visual C++ project files for running examples on Windows.

8/28/2001: mkoeppe
	   [Guile] Handle renamed overloaded functions properly;
	   thanks to Marc Zonzon <Marc.Zonzon@univ-rennes1.fr> for the
	   patch.  See the new test case name_cxx.

8/27/2001: mkoeppe
	   [Tcl] Removed lots of warnings issued by the Sun Forte
	   compilers, which were caused by mixing function pointers
	   of different linkages (C++/C). 

8/23/2001: mkoeppe
	   Improved the MzScheme module by porting Guile's pointer
	   type checking system and making type dispatch
	   typemap-driven. 

8/22/2001: beazley
           Entirely new symbol table processing.   SWIG should be able to
           report much better error messages for multiple declarations. 
           Also, the new symbol table allows for overloaded functions
           (although overloading isn't quite supported in the language
           modules yet).

8/22/2001: cheetah (william fulton)
           * [Java] %new support added.
           * [Java] Package JNI name refixed!

8/19/2001: beazley
           Python module modified to support pointers to C++ members.  This
           is an experimental feature.
           *** NEW FEATURE ***
     
8/19/2001: beazley
           Added limited parsing and full type-system support for pointers to
           members. None of SWIG's language modules really know how to deal with
           this so this is really only provided for completeness and future
           expansion.  Note: SWIG does not support pointers to members which 
           are themselves pointers to members, references to pointers to members,
           or other complicated declarations like this.
           *** NEW FEATURE ***

8/19/2001: beazley
           SWIG is much better at parsing certain C++ declarations. Operators and
           friends generally don't cause anymore syntax errors.  However, neither
           are really supported.

8/18/2001: beazley
           Added *highly* experimental support for wrapping of C++
           template declarations.  Since C++ templates are essentially
           glorified macros and SWIG has a fully operational C 
           preprocessor with macro support, the parser now converts
           template declarations to macros.  For example, a function
           template like this

               template<class T> T max(T a, T b);

           is internally converted into a macro like this:

               %define %_template_max(__name,T)
               %name(__name) T max(T a, T b);
               %enddef

           To instantiate a version of the template, a special %template declaration
           is used like this:

               %template(maxint) max<int>;          
               %template(maxdouble) max<double>;

           The parameter to the %template directive must be proper C identifier that's
           used to uniquely name the resulting instantiation.   When used, the
           the expanded macro looks like this:

              %name(maxint) int max(int a, int b);
              %name(maxdouble) double max(double a, double b);

           A similar technique is used for template classes.   For instance:

              template<class T> class vector {
                 T *data;
                 int sz;
              public:
                 vector(int nitems);
                 T *get(int n);
                 ...
              };

           Gets converted into a macro like this:

              %define %_template_vector(__name, T)
              %{
              typedef vector<T> __name;
              %}
              class __name {
                 T *data;
                 int sz;
              public:
                 __name(int nitems);
                 T *get(int n);
                 ...
              };
              typedef __name vector<T>;
              %enddef

           An a specific instantiation is created in exactly the same way:

             %template(intvec) vector<int>;

           The resulting code parsed by SWIG is then:

              %{
              typedef vector<int> intvec;
              %}
              class intvec {
                  int *data;
                  int sz;
              public:
                  intvec(int nitems);
                  int *get(int n);
                  ...
              };
              typedef intvec vector<int>;

           Note: the last typedef is non-standard C and is used by SWIG to provide
           an association between the name "intvec" and the template type 
           "vector<int>".

           CAUTION:  This is an experimental feature and the first time SWIG has
           supported C++ templates.   Error reporting is essential non-existent.
           It will probably break in certain cases.
           *** EXPERIMENTAL NEW FEATURE ****

8/15/2001: beazley
           Change to wrapping of multi-dimensional arrays.  Arrays
           are now properly mapped to a pointer to an array of
           one less dimension.  For example:

                int [10];              -->  int *
                int [10][20];          -->  int (*)[20];
                int [10][20][30];      -->  int (*)[20][30];

           This change may break certain SWIG extensions because
           older versions simply mapped all arrays into a single
           pointer such as "int *".   Although possibly unusual, 
           the new version is correct in terms of the C type system.
           *** POTENTIAL INCOMPATIBILITY ***
    
8/06/2001: cheetah (william fulton)
           * [Java] Array setters generated for struct/class array members.

8/13/2001: beazley
           Many improvements to Tcl/Perl/Python modules to better
           work with multiple interface files and the %import directive.

8/13/2001: beazley
           Fixed up the behavior of %import in the Python module.
           SWIG no longer pollutes the module namespace by using
           'from module import *' to refer to the other module. 
           Instead, it does a proper 'import module'.   Also, SWIG
           may work a lot better when importing modules that include
           references to other imported modules.

8/13/2001: mkoeppe
	   Added new typemap substitutions, generalizing those of the
	   Guile-specific 5/27/2001 changes: 
	   * $descriptor is the same as SWIGTYPE$mangle, but also
	     ensures that the type descriptor of this name gets
	     defined.
	   * $*type, $*ltype, $*mangle, $*descriptor are the same as
	     the variants without star, but they REMOVE one level of
	     pointers from the type. (This is only valid for pointer 
	     types.)
	   * $&type, $&ltype, $&mangle, $&descriptor are the same as
	     the variants without ampersand, but they ADD one level of
	     pointers to the type.
	   The Guile-specific substitution $basedescriptor was removed
	   because it was useless.

8/12/2001: beazley
           The %extern directive is now deprecated and withdrawn.  The
           purpose of this directive was to import selected definitions
           from other interface files and headers.  However, the same
           functionality is better handled through %import.   This
           leaves SWIG with two file inclusion directives:

              %include filename     - Inserts into current interface
              %import filename      - Import types and classes from 
                                      another module

           *** POTENTIAL INCOMPATIBILITY ***

8/09/2001: beazley
           Added new support for wrapping C/C++ callback functions. 
           A common problem with some C libraries is that many
           functions take a function pointer as an argument. For example:

              int do_op(..., int (*op)(int,int), ...);

           Unfortunately, the only way to call such a function is to
           pass it a function pointer of some compatible type.  In
           previous versions of SWIG, you had to solve this problem
           with some really gross hacks.  For example, if you wanted to
           use the following function as a callback,

               int foo(int, int);

           you had to install a pointer to it as a constant.  For example:

               %constant int (*FOO)(int,int) = foo;

           or 

               const int (*FOO)(int,int) = foo;

           or if you had a really old SWIG version:

               typedef int (*OP_FUNC)(int,int);
               int do_op(..., OP_FUNC, ...);
               const OP_FUNC FOO = foo;

           
           Now, you can do one of two things:

               %constant int foo(int,int);

           This creates a constant 'foo' of type int (*)(int,int).
           Alternatively, you can do this:

               %callback("%s")
               int foo(int,int);
               int bar(int,int);
               %nocallback

           In this case, the functions are installed as constants where
           the name is defined by the format string given to %callback().
           If the names generated by the format string differ from the
           actual function name, both a function wrapper and a callback 
           constant are created.  For example:

               %callback("%(upper)s")
               int foo(int,int);
               int bar(int,int);
               %nocallback
           
           Creates two wrapper functions 'foo', 'bar' and additionally
           creates two callback constants 'FOO', 'BAR'.

           Note: SWIG still does not provide automatic support for 
           writing callback functions in the target language.
           *** NEW FEATURE ***

8/06/2001: cheetah (william fulton)
           * struct nesting fixes as per SF bug #447488.

8/03/2001: beazley
           The %name directive now applies to constants created with
           #define and %constant.  However, most language modules
           were never written to support this and will have to be
           modified to make it work.  Tcl, Python, and Perl modules
           are working now.
           *** NEW FEATURE ***

8/03/2001: beazley
           Massive changes and simplification of C declaration parsing.
           Although SWIG is still not a full C parser, its ability
           to handle complex datatypes including pointers to functions
           and pointers to arrays has been vastly improved.  

8/03/2001: cheetah (william fulton)
           * Distribution fixes: autoconf no longer needed to install SWIG.

8/02/2001: beazley
           Removed two undocumented parsing features.  SWIG no longer
           supports out-of-class static function or variable
           declarations.  For example:

                static int Foo::bar;

           This feature may return if there is sufficient demand. 
           However, since SWIG is most often used with header files,
           it is more likely for these definitions to be included
           in the class definition.
           *** POTENTIAL INCOMPATIBILITY ***

8/02/2001: cheetah (william fulton)
	   * Cleanup of the GIFPlot examples. Upgraded Java GIFPlot example.

8/01/2001: cheetah (william fulton)
	   * [Java] Efficiency changes: _cPtr used where possible rather than
	     getCPtr(). Bug fixes for inheritance - derived class sometimes
	     didn't delete the c memory when _delete() was called.
	   * [Java] Abstract c++ classes are wrapped with a java abstract shadow
	     class. Also a pure virtual function is mapped with an abstract method.
	   * The default output file has always been <module>_wrap.c. It is now
	     <module>_wrap.cxx if the -c++ commandline option is passed to swig.
	     This has been done as otherwise c++ code would appear in a c file.
           *** POTENTIAL INCOMPATIBILITY *** 

7/31/2001: beazley
           Modified the %constant directive to be more C-like in syntax.
           The syntax is now:

                %constant NAME = VALUE;
                %constant TYPE NAME = VALUE;
 
           For example:

                %constant Foo *Bar = &Spam;

           A more subtle case is as follows:

               %constant int (*FOO)(int,int) = blah;

           *** POTENTIAL INCOMPATIBILITY ***  Modules that were using
           the %constant directive directly will need to be modified.
      
7/30/2001: beazley
           Removed obscure and undocumented form of the %inline directive:

               %inline int blah(int a, int b) {
                  ...
               }

           *** POTENTIAL INCOMPATIBILITY *** 
           (note: this feature was never documented and is withdrawn)

7/30/2001: beazley
           Removed support for functions with no explicitly declared
           return type.  For example:

                  foo(int);

           In C, such functions were implicitly assumed to return an 'int'.
           In C++, this is illegal.  Either way, it's considered bad
           style.  Removing support for this in SWIG will simplify
           certain issues in parsing.
           *** POTENTIAL INCOMPATIBILITY ***

7/30/2001: mkoeppe
	   * Partial merge from the CVS trunk.  The Source/DOH directory
	     and most of the Source/Swig directory is up-to-date now.
	   * [Guile] %scheme is now a macro for %insert("scheme").  
	     New syntax:  %scheme "FILENAME"; 
	     New syntax:  %scheme %{ SCHEME-CODE %}
	     New macros %multiple_values, %values_as_list,
	     %values_as_vector. 

7/29/2001: beazley
           %readonly and %readwrite have been turned into SWIG pragmas.
           %pragma(swig) readonly and %pragma(swig) readwrite.  Macros
           are used to provide backwards compatibility.

7/29/2001: beazley
           Minor changes to %pragma directive.  %pragma must always
           be directed to a specific language.  For example:

              %pragma(swig) make_default;
              %pragma(perl5) include = "blah.i";

           Also extended the pragma directive to allow code blocks
 
              %pragma(foo) code = %{
                  ... some code ...
              %}

           *** POTENTIAL INCOMPATIBILITY ***

7/29/2001: beazley
           Change to the way 'const' variables are wrapped.  In 
           previous versions of SWIG, a 'const' variable was
           wrapped as a constant.   Now, 'const' variables are
           wrapped as read-only variables.  There are several
           reasons for making this change, mostly pertaining to
           subtle details of how 'const' actually works. 

           This will probably break old interfaces that used 'const'
           to create constants.   As a replacement, consider using this:

           const int a = 4;   ===>   %constant int a = 4;
           *** POTENTIAL INCOMPATIBILITY ***

7/29/2001: beazley
           Reorganization and simplification of type parsing.
           Types with 'const' should work correctly now.

7/29/2001: beazley
           Most swig directives related to the documentation system
           are now deprecated.

7/29/2001: beazley
           Removed support for Objective-C in order to simplify
           parser reconstruction.  Will return if there is sufficient
           demand.
           *** POTENTIAL INCOMPATIBILITY ***

7/29/2001: beazley
           Code inclusion has been modified in the parser.  A common
           directive %insert is now used for everything.  This
           inserts a file into the output:

               %insert(header) "foo.swg"

           This inserts some inline code into the output

               %insert(header) %{
                   ... some code ... 
               %}

           There are five predefined targets for the insert directive:

               "header"    - Header section of wrapper file
               "runtime"   - Runtime section of wrapper file
               "wrapper"   - Wrapper section
               "init"      - Initialization function
               "null"      - Nothing. Discard.

           The following directives are still supported, but are
           now defined in terms of macros:

               %{ ... %}           -> %insert(header)  %{ ... %}
               %init %{ ... %}     -> %insert(init)    %{ ... %}
               %wrapper %{ ... %}  -> %insert(wrapper) %{ ... %}
               %runtime %{ ... %}  -> %insert(runtime) %{ ... %}

           Language modules can define new named targets by using the
           C API function Swig_register_filebyname() (see main.cxx).
           For example, if you wanted to expose a shadow class file,
           you could do this:

              Swig_register_filebyname("shadow", f_shadow);

           Then in the interface file:

              %insert(shadow) %{ ... %}

           Note: this change should not affect any old interfaces, but
           does open up new possibilities for enhancements.

7/29/2001: beazley
           SWIG now always includes a standard library file 'swig.swg'.
           This file defines a large number of macro definitions
           that define the behavior of various SWIG directives.
           Previously, all SWIG directives were handled as special
           cases in the parser.  This made the parser a large 
           bloated mess.  Now, the parser is stripped down to a few
           simple directives and macros are used to handle everything else.

7/26/2001: cheetah (william fulton)
	   * Fixes for Sourceforge bug #444748 - new testcase cpp_static:
	     [TCL] Class with just static member variable/function fix
	     [Java] Fixed static variables support
	     [Ruby] Static variables workaround removed

7/27/2001: mkoeppe
	   * stype.c (SwigType_default): Strip qualifiers first. The
	     default type of "int * const" is now "SWIGPOINTER *".
	   * main.cxx: Define "__cplusplus" in SWIG's preprocessor if
	     in C++ mode.
	   * [Guile]: Added some support for arrays and C++
	     references, fixing the "constant_pointers" test case.
	   * Moved most tests from the old Guile-specific test-suite
	     to the new test-suite.  Also moved perl5/pointer-cxx
	     example there.

7/26/2001: cheetah (william fulton)
	   * Test-suite added.
	   * Initial testcases: constant_pointers cpp_enum defines
	     sizeof_pointers unions virtual_destructor
	   * Make clean improvements.

7/24/2001: cheetah (william fulton)
	   * [Java] Underscores in the package name and/or module name
	   no longer give linking problems.

7/17/2001: cheetah (william fulton)
	   * More parser bug fixes for constant pointers

7/19/2001: mkoeppe
	   * [Guile] Aesthetic improvement in variable wrappers.

7/18/2001: beazley
           * Fixed core-dump problem in pointer library when 
             freeing character arrays.
             SF Bug [ #415837 ] pointer lib core dump

7/18/2001: beazley
           * Fixed problem with default destructors and shadow
             classes.  SF bug #221128.

7/18/2001: beazley
           * To provide better line-number tracking in interfaces
             with lots of macros, special locator comments are
             now generated by the SWIG preprocessor.  For example:

                 /*@foo.i,42,BLAH@*/expanded macro/*@@*/

             The first /*@...@*/ sequence sets the context
             to point to the macro code.  The /*@@*/ comment
             terminates the context.  The SWIG parser should
             ignore all of the locator comments as should
             the C compiler (should such comments end up
             in generated wrapper code).

7/18/2001: mkoeppe
	   * The parser now handles severely constified types in
	   typemaps.  This introduced a new shift/reduce conflict, but
	   only with a heuristic function-pointer catch-all rule.  
	   * [Guile]: Added typemaps for severely constified types. 
	   * Fixed the "template-whitespace" problem by canonicalizing
	     whitespace, especially around angle brackets and commas. 

7/17/2001: mkoeppe
	   * [Guile]: A Scheme file is emitted if the -scmstub FILE.SCM
	   command-line option is used.  The %scheme directive
	   (implemented as a macro for a pragma) allows to insert
	   arbitrary code here.  In "simple" and "passive" linkage,
	   the file gets filled with define-module and export
	   declarations.

7/17/2001: cheetah (william fulton)
	   * Parser bug fix to support constant pointers, eg int* const ptr.
	   Fixed everywhere - variables, parameters, return types etc. Note that
	   when wrapping a constant pointer variable only the getter is generated.

7/17/2001: mkoeppe
	   * Fixed SF bug #441470 (#define X "//" would not be parsed,
	     see test-suite entry "preproc-1"), reported by T. W. Burton
	     <twburton@users.sf.net>.
	   * Changed the type of character constants to "char", rather
	     than "char *".  Changed the individual language modules
	     to keep the old behaviour, except for the Guile module,
	     where it is desired to make them Scheme characters.  This
	     fixes SF bug #231409, test-suite entry "char-constant".
	   * Applied patch for DOH/Doh/memory.c by Les Schaffer
	     <schaffer@optonline.net> (avoid required side effects in
	     assert). 

7/17/2001: cheetah (william fulton)
	   * Bug fix in parser for virtual destructor with void as parameter
	   * Bug fix in parser #defines embedded within classes/structs/unions
	   Consequently %constant can now also be placed within a struct/class/union.
	   * Bug fix in parser to allow sizeof(*I_am_a_pointer) within a #define

7/16/2001: mkoeppe
	   * Added changes for the Macintosh contributed by Luigi
	   Ballabio <ballabio@mac.com>. 
	   * Some "const" fixes in the code.
	   * [Guile]: Made the constant-wrapper functions much shorter.

7/13/2001: mkoeppe
	   * [Guile]: Some "const" fixes for Guile version 1.3.4.
	   * Handle anonymous arguments with default values and static
	     array members of classes.  Both bugs reported by Annalisa Terracina
	     <annalisa.terracina@datamat.it>; see the files
	     Examples/guile/test-suite/static-array-member.i and
	     anonymous-arg.i.

Version 1.3.6  (July 9, 2001)
=============================

7/09/2001: cheetah (william fulton)
	   * GIFPlot examples: FOREGROUND and BACKGROUND definition missing 
	   after TRANSPARENT #define fix in GIFPlot

7/03/2001: beazley
           Fixed up the version numbers so that the release is known
           as 1.3.6.  All future releases should have a similar
           version format.

7/02/2001: mkoeppe
	   * [Python]: Prevent the problem of self.thisown not being
	   defined if the C++ class constructor raised an exception.
	   Thanks to Luigi Ballabio <ballabio@mac.com>.

6/29/2001: mkoeppe
	   * More portability fixes; fixed "gcc -Wall" warnings.

6/29/2001: cheetah (william fulton)
	   * GIFPlot examples: TRANSPARENT #define multiple times on Solaris 
	   (clashes with stream.h).
	   * Multiple definition bug fix for shadow classes. The perl and python 
	   modules had workarounds which have been replaced with fixes in 
	   the core. Many of the Language::cpp_xxxx functions now set a 
	   flag which the derived classes can access through 
	   is_multiple_definition() to see whether or not code should be 
	   generated.  The code below would have produced varying degrees 
	   of incorrect shadow class code for the various modules:
	   class TestClass
	   {
	   public:
	     TestClass() {};
	     TestClass(int a) {};
	     ~TestClass() {};
	     unsigned long xyz(short k) {};
	     unsigned long xyz(int n) {};
	     static void static_func() {};
	     static void static_func(int a) {};
	   };
	   void delete_TestClass(int a);

6/27/2001: mkoeppe
	   * [Perl] Another const-related portability fix.

6/26/2001: cheetah (william fulton)
	   * [Java] Added in cpp_pragma() support with a host of new pragmas - see 
	   jswig.html. These are designed for better mixing of Java and c++. It 
	   enables the user to specify pure Java classes as bases and/or interfaces 
	   for the wrapped c/c++.
	   * [Java] Old pragmas renamed. Warning given for the moment if used.
          *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***

6/25/2001: mkoeppe
	   * Incorporated more build changes contributed by Wyss Clemens
	   <WYS@helbling.ch> for swig/ruby on cygwin.

6/20/2001: cheetah (william fulton)
	   * Makefile mods so that 'make check' uses the swig options in the makefiles
	   * [Java] Removed Generating wrappers message
	   * [Java] NULL pointer bug fix
	   * [Java] Bug fix for Kaffe JVM

6/20/2001: mkoeppe
	   * SWIG_TypeQuery from common.swg now returns a
	   swig_type_info* rather than a void*.  This fixes a problem
	   when using pointer.i and C++, as illustrated by the new
	   test-suite example perl5/pointer-cxx.
	   * Portability fixes (const char *). 
	   * Incorporated build changes contributed by Wyss Clemens
	   <WYS@helbling.ch>, which make swig runnable on cygwin.

6/19/2001: cheetah (william fulton)
	   * [Java] Bug fix for SF bug #211144. This fix is a workaround 
	     until fixed in the core.

6/19/2001: mkoeppe
	   * [Guile]: Portability fixes for use with the Sun Forte
	   compilers. 
	   * [Tcl]: Portability fix (const char *).
	   * [Tcl]: Configure now first tries to find a tclConfig.sh
	   file in order to find the Tcl include directory, library
	   location and library name.
	   * [Python]: Added a few possible library locations.

6/18/2001: mkoeppe
	   * [Guile]: Don't call scm_c_export if nothing is to be
	     exported.  Don't warn on %module if module has been set
	     already (this frequently occurs when %import is used).

6/16/2001: mkoeppe
	   * [Guile]: New "passive" linkage, which is appropriate for
	     multi-module extensions without Guile module magic.

6/15/2001: mkoeppe
	   * [Guile]: Fixed printing of smobs (space and angle were
	     missing). 
	   * Properly generate type information for base classes
	     imported with the %import directive.  Thanks to Marcelo
	     Matus <mmatus@acms.arizona.edu> for the report and the
	     patch; this closes SF bug #231619; see also
	     Examples/guile/test-suite/import*. 
	   * [Guile]: Fix casting between class and base class; the
	     runtime type system had it the wrong way around; see
	     Examples/guile/test-suite/casts.i
	   * Make typemaps for SWIGPOINTER * with arg name take
	     precedence over those without arg name, to match normal
	     typemap precedence rules.
	   * Fixed the random-line-numbers problem reported as SF bug
	     #217310; thanks to Michael Scharf <scharf@users.sf.net>.
	   * [Guile]: Handle the %name and %rename directives.
	   * New syntax: %name and %rename now optionally take double
	     quotes around the scripting name.  This is to allow scripting
	     names that aren't valid C identifiers.

6/14/2001: beazley
           Made a minor change to the way files are loaded in
           order to get file/line number reporting correct in
           the preprocessor.

6/14/2001: mkoeppe
	   * The parser now understands the (non-standard) "long long"
	     types. It is up to the individual language modules to
	     provide typemaps if needed. Reported by Sam Steingold, SF
	     bug #429176.
	   * The parser now understands arguments like "const int *
	     const i". This fixes SF bug #215649.
	   * Fixed the Guile test-suite.

6/13/2001: mkoeppe
	   Partial merge from the CVS trunk at tag
	   "mkoeppe-merge-1". This covers the following changes:

| 01/16/01: ttn
|	   Wrote table of contents for Doc/engineering.html.  Added section
|	   on CVS tagging conventions.  Added copyright to other docs.
| 9/25/00 : beazley
| 	   Modified the preprocessor so that macro names can start with a '%'.
| 	   This may allow new SWIG "directives" to be defined as macros instead
| 	   of having to be hard-coded into the parser.  
|
| *** Also a yet-to-be-documented quoting mechanism with backquotes
| *** has been implemented?

6/13/2001: mkoeppe
	 * When configure does not find a language, don't use default
	   paths like /usr/local/include; this only causes build
	   problems.
	 * New directory: Examples/Guile/test-suite, where a few
	   bugs in 1.3a5 are demonstrated. 
	 * Handle C++ methods that have both a "const" and a "throw"
	   directive (see Examples/Guile/test-suite/cplusplus-throw.i); 
	   thanks to Scott B. Drummonds for the report and the fix. 
	 * Handle C++ pointer-reference arguments (like "int *& arg") 
	   (see Examples/Guile/test-suite/pointer-reference.i,
	   reported as SF bug #432224).
	 * [Ruby] Fixed typo in rubydec.swg; thanks to Lyle Johnson!
	 * Don't stop testing when one test fails.
	 * [Guile, MzScheme] Don't print "Generating wrappers...".

6/12/2001: mkoeppe
	   [Guile] VECTORLENINPUT and LISTLENINPUT now have separate
	   list length variables. TYPEMAP_POINTER_INPUT_OUTPUT
	   attaches argument documentation involving SCM_TYPE to the
	   standard pointer typemaps. INOUT is now an alias for BOTH.

6/12/2001: cheetah (william fulton)
	   Some Java documentation added.
	   [Java] Fixed bugs in import pragma and shadow pragma. 

6/12/2001: mkoeppe
	   Fix declarations of SWIG_define_class
	   (Lib/ruby/rubydec.swg) and SWIG_TypeQuery
	   (Lib/common.swg). Thanks to Lyle Johnson
	   <ljohnson@resgen.com> for the patches.

6/11/2001: mkoeppe
	   [Guile] Use long instead of scm_bits_t; this makes the
	   generated wrapper code compatible with Guile 1.3.4
	   again. Thanks to Masaki Fukushima for pointing this out.

6/11/2001: cheetah (william fulton)
	   The generic INSTALL file from autoconf added. Few changes to README file.

6/11/2001: mkoeppe
	   Fixed typo in Makefile.in; thanks to Greg Troxel
	   <gdt@ir.bbn.com>. 

6/08/2001: cheetah (william fulton)
	   make check works again. Examples/GIFPlot configure generated by
	   top level autoconf now.

6/08/2001: mkoeppe
	   Another build change: The new script autogen.sh runs
	   autoconf in the appropriate directories.  The top-level
	   configure also configures in Examples/GIFPlot.

6/07/2001: mkoeppe
	   Made the Makefile work with non-GNU make again.

6/07/2001: cheetah (william fulton)
	   [Java] Class/struct members that are arrays of pointers to classes/structs -
	   Shadow class's get/set accessors now use Java classes instead of longs (pointers).
	   [Java] Shadow classes will now clean up memory if function return type 
	   is a class/struct.
	   [Java] New example called reference based on the same example from other modules.

6/06/2001: mkoeppe
	   New configure option --with-release-suffix allows for
	   attaching a suffix to the swig binary and the swig runtime
	   libraries.  Minor changes to the build system.  "swig
	   -swiglib" works again.  If invoked with the new option
	   "-ldflags", SWIG prints a line of linker flags needed to
	   link with the runtime library of the selected language
	   module. 

6/06/2001: mkoeppe
	   [Guile] gswig_list_p is an int, not a SCM.  This typo
	   caused warnings when compiling with a Guile configured with
	   strict C type checking. In INPUT and BOTH typemaps
	   generated by the SIMPLE_MAP macro, use the SCM_TO_C
	   function to convert from Guile to C (rather than C_TO_SCM).
	   Use scm_intprint to print pointers (rather than
	   sprintf). Allow using "-linkage" instead of "-Linkage". 

6/05/2001: cheetah (william fulton)
	   [Java] Mods for using inherited c++ classes from Java
	   [Java] New example called class based on the same example from other modules

6/05/2001: cheetah (william fulton)
	   [Java] destructor (_delete()) was not aware of %name renaming
	   [Java] extends baseclass did not know about %name renaming
	   [Java] extends baseclass did extend even when the baseclass was not known to swig
	   [Java] sometimes enum-declarations occured before the Java class declaration
	   [Java] unrelated enum initialisations no longer appear in Java class
	   [Java] if module ends in '_' correct JNI names are now produced

6/04/2001: cheetah (william fulton)
	   [Java] Shadow class mods - Modified constructor replaces
	   newInstance(). _delete() now thread safe. getCPtr() replaces
	   _self. _selfClass() removed as now redundant. 
          *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***

	   [Java] Not all output java files had SWIG banner. New banner.

	   [Java] Shadow class finalizers are output by default: Command
	   line option -finalize deprecated and replaced with -nofinalize.
          *** POTENTIAL INCOMPATIBILITY FOR JAVA MODULE ***

6/ 1/2001: mkoeppe
	   [Guile] Cast SCM_CAR() to scm_bits_t before shifting it.
	   This is required for compiling with a Guile configured with
	   strict C type checking.  

6/ 1/2001: mkoeppe
	   Added configure option "--with-swiglibdir".

5/31/2001: mkoeppe
	   [Guile] Support multiple parallel lists or vectors in
	   the typemaps provided by list-vector.i.  New typemaps file,
	   pointer-in-out.i. 

5/25/2001: cheetah (william fulton)
	   [Java] HTML update for examples.

5/28/2001: mkoeppe
	   Minor changes to the build system.  Added subdirectory for
	   Debian package control files.

5/28/2001: mkoeppe
	   [Guile] Build a runtime library, libswigguile.

5/28/2001: mkoeppe
	   [Guile] New typemap substitution $*descriptor.  Use the {}
	   syntax, rather than the "" syntax for the standard
	   typemaps, in order to work around strange macro-expansion
	   behavior of the SWIG preprocessor.  This introduces some
	   extra braces.

5/27/2001: mkoeppe
	   [Guile] Handle pointer types with typemaps, rather than
	   hard-coded. New typemap substitutions $descriptor,
	   $basedescriptor; see documentation. Some clean-up in the
	   variable/constants wrapper generator code.  New convenience
	   macro SWIG_Guile_MustGetPtr, which allows getting pointers
	   from smobs in a functional style.  New typemap file
	   "list-vector.i", providing macros that define typemaps for
	   converting between C arrays and Scheme lists and vectors.

5/25/2001: cheetah (william fulton)
	   [Java] STL string moved into its own typemap as it is c++ code and 
	   it break any c code using the typemaps.i file.
	   - Fixes for wrappers around global variables - applies to primitive 
	   types and user types (class/struct) and pointers to these.
	   - Structure member variables and class public member variables getters 
	   and setters pass a pointer to the member as was in 1.3a3 and 1.1 
	   (1.3a5 was passing by value)
	   - Parameters that were arrays and return types were incorrectly 
	   being passed to create_function() as pointers.
	   - Fix for arrays of enums. 
	   [Java] Updated java examples and added two more.
	   [Java] Java module updated from SWIG1.3a3 including code cleanup etc.
	   [Java] enum support added.
	   [Java] Array support implemented
	   [Java] Shadow classes improved - Java objects used rather than 
	   longs holding the c pointer to the wrapped structure/c++class

5/22/2001: mkoeppe
	   [Guile] Fixed extern "C" declarations in C++ mode. Thanks
	   to Greg Troxel <gdt@ir.bbn.com>.

5/21/2001: mkoeppe
	   [Guile] New linkage "module" for creating Guile modules for
	   Guile versions >= 1.5.0. 

4/18/2001: mkoeppe
	   [MzScheme] Added typemaps for passing through Scheme_Object
	   pointers. 

4/9/2001 : mkoeppe 
	   [MzScheme] Added typemaps for `bool'.  Inclusion of headers
	   and support routines is now data-driven via mzscheme.i.
	   Headers come from the new file mzschemdec.swg.  Don't abort
	   immediately when a type-handling error is reported.  When
	   searching for typemaps for enums, fall back to using int,
	   like the Guile backend does.  Support char constants.  Emit
	   correct wrapper code for variables.

3/12/2001: mkoeppe
	   [Guile] Fixed typemaps for char **OUTPUT, char **BOTH.

3/2/2001 : mkoeppe 
	   [Guile] Every wrapper function now gets a boolean variable
	   gswig_list_p which indicates whether multiple values are
	   present. The macros GUILE_APPEND_RESULT, GUILE_MAYBE_VALUES
	   and GUILE_MAYBE_VECTOR use this variable, rather than
	   checking whether the current return value is a list. This
	   allows for typemaps returning a list as a single value (a
	   list was erroneously converted into a vector or a
	   multiple-value object in this case).

3/1/2001 : mkoeppe
	   [Guile] Added support for returning multiple values as
	   vectors, or passing them to a muliple-value
	   continuation. By default, multiple values still get
	   returned as a list.

3/1/2001 : mkoeppe
	   [Guile] Added a "beforereturn" pragma. The value of this
	   pragma is inserted just before every return statement.

3/1/2001 : mkoeppe
	   [Guile] Added support for Guile 1.4.1 procedure
	   documentation formats, see internals.html.

2/26/2001: mkoeppe
	   [Guile] Made the wrapper code compile with C++ if the
	   "-c++" command-line switch is given.  Thanks to
	   <monkeyiq@dingoblue.net.au>. 

2/26/2001: mkoeppe
	   [Guile] Now two type tables, swig_types and
	   swig_types_initial, are used, as all other SWIG language
	   modules do.  This removes the need for the tricky
	   construction used before that the broken Redhat 7.0 gcc
	   doesn't parse. Reported by <monkeyiq@dingoblue.net.au>. 

2/26/2001: mkoeppe
	   [Guile] Fixed typemaps for char *OUTPUT, char *BOTH; a bad
	   free() would be emitted.  Added typemap for SCM.


Version 1.3 Alpha 5 
===================

9/19/00 : beazley
          [Python] Python module generates more efficient code for
          creating the return value of a wrapper function. Modification
          suggested by Jon Travis.

9/19/00 : beazley
          Library files specified with the -l option are now included at the
          end of the interface file (reverting to the old behavior).

9/19/00 : beazley
          Fixed some problems with enum handling.  enums are now manipulated as
          'int', but cast into the enum type when values are passed to the 
          corresponding C function.

9/19/00 : mkoeppe
	  [Guile] Removed "-with-smobs" command-line option, as this is the
	  default now.  Added "-emit-setters" command-line option,
	  which turns on generating procedures-with-setters; see
	  internals.html.

9/18/00 : mkoeppe
	  Incorporated patch #101430, fixing bugs in the Guile module: 
	  1. Some arguments were erroneously taken as *optional* arguments when
	     ignored arguments were present. 
	  2. Guile 1.3.4 was not supported since functions introduced in Guile
	      1.4 were used.	  
	  3. Added handling of `const char *'.

9/17/00 : beazley
          Fixed problem with failed assertion and large files.

9/17/00 : beazley
          Fixed problem with the '%' character appearing in added methods
          and function bodies.  Preprocessor bug.

Version 1.3 Alpha 4 (September 4, 2000)
======================================

9/3/00  : ttn
          Added instructions for maintainers in Examples/README on how
          to make examples also be useful in the testing framework.
          Also, "make check" now uses ./Lib by via env var `SWIG_LIB'.
          This is overridable like so:
             make chk-swiglib=/my/experimental/swig/Lib check

9/3/00  : beazley
          Added $typemap variable to typemaps.  This gets replaced with
          a string indicating the typemap that is applied.  Feature
          request from rsalz.

9/3/00  : beazley
          Experimental optimization to code generation for virtual
          member functions.  If you have two classes like this:

                 class A() {
                   virtual void foo();
                 }

                 class B() : public A {
                   virtual void foo();
                 }

          Swig now will generate a single wrapper function for this

                A_foo(A *a) {
                    a->foo();
                }

          and use it as the implementation of both A_foo() and B_foo().
          This optimization only takes place if both methods are declared
          as virtual and both take identical parameters.
          *** EXPERIMENTAL FEATURE ***

9/3/00  : beazley
          Restored the "memberin" typemap for setting structure members.
          Unlike the old version, the new version is expanded inline in the
          wrapper function allowing access to scripting language
          internals (a sometimes requested feature). The "memberout" typemap
          is gone. Use the "out" typemaps instead.
          *** POTENTIAL INCOMPATIBILITY ***

9/3/00  : beazley
          Attribute set methods no longer return the value of a member.
          For example:

               struct Foo {
                    int x;
                    ...
               }

          now gets set as follows:

              void Foo_x_set(Foo *f, int x) {
                    f->x = x;
              }

          In SWIG1.1 it used to be this:

              int Foo_x_set(Foo *f, int x) {
                   return (f->x = x);
              }

          This has been changed due to the complexity created by trying
          to do this with more exotic datatypes such as arrays.  It also
          complicates inlining and handling of the "memberin" typemap.
          *** POTENTIAL INCOMPATIBILITY ***

9/2/00  : beazley
          Removed the ptrcast() and ptrmap() functions from the
          pointer.i library file.  Old implementation is incompatible
          with new type system.
          *** POTENTIAL INCOMPATIBILITY ***

9/2/00  : beazley
          New runtime function SWIG_TypeQuery(const char *name) added.
          This function can be used to extract the type info structure
          that is used for type-checking.  It works with either the
          nice C name or mangled version of a datatype.  For example:

              swig_type_info *ty = Swig_TypeQuery("int *");
              swig_type_info *ty = Swig_TypeQuery("_p_int");

          This is an advanced feature that has been added to support some
          exotic extension modules that need to directly manipulate
          scripting language objects.
          *** NEW FEATURE ***

9/2/00  : beazley
          New directive %types() added.  This is used to
          explicitly list datatypes that should be included in
          the runtime type-checking code. Normally it is never
          necessary to use this but sometimes advanced extensions
          (such as the pointer.i library) may need to manually
          add types to the type-checker.
          *** NEW FEATURE ***

8/31/00 : beazley
          Improved handling of string array variables. For example,
          a global variable of the form "char name[64]" is automatically
          managed as a 64 character string.  Previously this didn't
          work at all or required the use of a special typemap.
          *** NEW FEATURE (Tcl, Perl, Python) ***

8/31/00 : ttn
	  Added Makefile target `check-c++-examples', which uses new
	  files under Examples/C++ contributed by Tal Shalif.  Now "make
	  check" also does "make check-c++-examples".  Also, expanded
	  actions in `check-gifplot-example' and `check-aliveness'.

8/30/00 : mkoeppe
	  Major clean-up in the Guile module. Added typemap-driven
	  documentation system. Changed to handle more than 10
	  args. Updated and extended examples.
	  *** NEW FEATURE ***

8/29/00 : beazley
          Added new %insert directive that inserts the contents of a file
          into a portion of the output wrapper file.  This is only intended
          for use by writers of language modules.  Works as follows:

               %insert(headers)  "file.swg";
               %insert(runtime)  "file.swg";
               %insert(wrappers) "file.swg";
               %insert(init)     "file.swg";

          *** NEW FEATURE ***

8/29/00 : beazley
          Added new %runtime directive which includes code into the runtime
          portion of the wrapper code. For example:

              %runtime %{
                    ... some internal runtime code ...
              %}

          There is no practical reason for ordinary users to use this
          feature (almost everything can be done using %{ ... %}
          instead).   However, writers of language modules may want to
          use this in language configuration files.
          *** NEW FEATURE ***

8/28/00 : beazley
          Typemaps can now be specified using string literals like
          this:

              %typemap(in) int "$target = SvIV($source);";

          When code is specified like this, it is *NOT* enclosed
          inside a local scope (as with older typemap declarations).
          Note: character escape sequences are interpreted in the
          code string so if you want to include a quote or some
          other special character, make sure you use a (\).
          *** NEW FEATURE ***

8/27/00 : beazley
          Typemaps have been modified to follow typedef declarations.
          For example, if you have this:

              typedef int Number;

              %typemap(in) int {
                      ... get an integer ...
              }

              void foo(Number a);

          The typemap for 'int' will be applied to the argument 'Number a'.
          Of course, if you specify a typemap for 'Number' it will take
          precedence (nor will it ever be applied to an 'int').
          *** POTENTIAL INCOMPATIBILITY ***

8/27/00 : beazley
          Default typemap specification has changed.   In older
          versions of swig, you could do this:

               %typemap(in) int SWIG_DEFAULT_TYPE {
                   ...
               }

          To specify the default handling of a datatype.   Now that
          SWIG follows typedef declarations, this is unnecessary.
          Simply specifying a typemap for 'int' will work for all
          variations of integers that are typedef'd to 'int'.

          Caveat, specifying the default behavior for pointers,
          references, arrays, and user defined types is a little
          different.  This must be done as follows:

               %typemap() SWIGPOINTER * {
                      ... a pointer ...
               }
               %typemap() SWIGREFERENCE & {
                      ... a reference ...
               }
               %typemap() SWIGARRAY [] {
                      ... an array ...
               }
               %typemap() SWIGTYPE {
                      ... a user-defined type (by value) ...
               }
          *** POTENTIAL INCOMPATIBILITY ***

8/15/00 : dustin
          The file swig-1.3a1-1.spec has been added to the Tools directory.
          It can be used to build a redhat package for SWIG, although it
          will need to be updated for the next public release.

8/15/00 : beazley
          Typemaps have been completely rewritten.  Eventually they may be
          replaced with something better, but for now they stay.  However,
          there are a number of a significant changes that may trip some
          people up:

          1.  Typemap scoping is currently broken.  Because of this, the
              following code won't work.

              %typemap(in) blah * {
                   ...
              }
              class Foo {
                   ...
                   int bar(blah *x);
              }
              %typemap(in) blah *;   /* Clear typemap */

              (this breaks because the code for the class Foo is actually
              generated after the entire interface file has been processed).
              This is only a temporary bug.

          2.  In SWIG1.1, the %apply directive worked by performing a
              very complex type-aliasing procedure.  From this point on,
              %apply is simply a generalized typemap copy operation.
              For example,

                  %apply double *OUTPUT { double *x, double *y };

              Copies *ALL* currently defined typemaps for 'double *OUTPUT' and
              copies them to 'double *x' and 'double *y'.

              Most people probably won't even notice this change in
              %apply.  However, where it will break things is in code like
              this:

                  %apply double *OUTPUT { double *x };
                  %typemap(in) double *OUTPUT {
                       ... whatever ...
                  }

                  void foo(double *x);

              In SWIG1.1, you will find that 'foo' uses the 'double *OUTPUT' rule
              even though it was defined after the %apply directive (this is
              the weird aliasing scheme at work).  In SWIG1.3 and later,
              the 'double *OUTPUT' rule is ignored because it is defined
              after the %apply directive.

          3.  The %clear directive has been modified to erase all currently
              defined typemaps for a particular type.  This differs from
              SWIG1.1 where %clear only removed rules that were added using
              the %apply directive.

          4.  Typemap matching is now performed using *exact* types.
              This means that things like this

                   %typemap(in) char * { }
                   %typemap(in) const char * { }

              are different typemaps.    A similar rule applies for pointers,
              arrays, and references.  For example:

                   %typemap(in) double * { }

              used to apply to 'double &', 'double []',  Now, it only applies
              to 'double *'.  If you want a 'double &', you'll need to handle
              that separately.

          5.  Array matching has been simplfied.  In SWIG1.1, array matching
              was performed by trying various combinations of dimensions.
              For example, 'double a[10][20]' was matched as follows:

                   double [10][20]
                   double [ANY][20]
                   double [10][ANY]
                   double [ANY][ANY]

              In SWIG1.3, only the following matches are attempted:

                   double [10][20]
                   double [ANY][ANY]

          On the positive side, typemap matching is now *significantly* faster
          than before.
          *** POTENTIAL INCOMPATIBILITY ***

8/15/00 : beazley
          Secret developer feature.  Since datatypes are now represented as 
          strings internally, you can bypass limitations of the parser and
          create a wild datatype by simply enclosing the raw string encoding
          in backticks (``) and sticking it in the interface file anywhere a
          type is expected.  For example, `a(20).a(10).p.f(int,int)`.  This 
          feature is only intended for testing (i.e., you want to see what
          happens to your language module if it gets a reference to a pointer
          to an array of pointers to functions or something). 
          *** SICK HACK ***

8/14/00 : beazley
          Completely new type-system added to the implementation.
          More details later.

8/11/00 : beazley
          Cleaned up some of the I/O handling.  SWIG no longer generates
          any temporary files such as _wrap.wrap, _wrap.ii, _wrap.init.
          Instead, these "files" are kept around in memory as strings
          (although this is transparent to language modules).

8/4/00  : ttn
	  Added Makefile target "check" and variants.
	  This can be used like "make check" or, to explicitly skip a
	  language LANG: "make skip-LANG=true check".  LANG is skipped
	  automatically if ./configure determines that LANG support is
	  insufficient.

	  Currently, the check is limited to doing the equivalent of
	  "make all" in some of the Examples directories.  This should
	  be expanded both horizontally (different types of tests) and
	  vertically (after "make all" in an Examples subdir succeeds,
	  do some additional tests with the resulting interpreter, etc).

8/4/00  : ttn
	  Added Makefile target "distclean", which deletes all the
	  files ./configure creates, including config.status and friends.

8/3/00  : harcoh
	  java changes??? [todo: document changes]

7/23/00 : beazley
          Typemaps have been modified to key off of the real datatypes
          used in the interface file.  This means that typemaps for
          "const char *" and "char *" will be difference as will typemaps
          for "Vector" and "Vector *."
          *** POTENTIAL INCOMPATIBILITY ***
          This is likely to break interfaces that rely on the odd type
          handling behavior of typemaps in SWIG1.1--especially with
          respect to interfaces involving pass-by-value.

7/23/00 : beazley
          New %constant directive.  This directive can be used to
          create true constants in the target scripting language.
          It's most simple form is something like this:

             %constant FOO 42;

          In this case, the type is inferred from the syntax of the
          value (in reality, all #define macros are translated into
          directives of this form).

          An expanded version is as follows:

            %constant(Foo *) FOO = &FooObj;

          In this case, an explicit type can be specified.  This
          latter form may be useful for creating constants that
          used to be specified as

             const Foo *FOO = &FooObj;

          (which are now treated as variables).
          *** EXPERIMENTAL FEATURE *** The syntax may change in
          the final release.

7/23/00 : beazley
          Modified the parser so that variable declarations of the form
          "const type *a" are handled as variables, not constants.
          Note: SWIG1.1 handled this case erroneously because
          const char *a is a pointer variable that can be reassigned.
          *** POTENTIAL INCOMPATIBILITY ***
          Note: just because this is the "right" way to do things,
          doesn't mean it's the most appropriate interpretation.
          I suspect that many C programmers might use 'const char *'
          with the intent of creating a constant, without realizing
          that they've created a reassignable global variable.

7/23/00 : beazley
          The C/C++ wrapping layer has been completely redesigned and
          reimplemented.  This change should iron out a few rough
          spots with the handling of datatypes.  In addition, the
          wrapper code is somewhat cleaner.
          *** POTENTIAL INCOMPATIBILITY ***
          This change may break interfaces that involve
          subtle corner-cases with typemaps and the %addmethods
          directive since some of these features had somewhat
          type handling behavior in SWIG1.1.

7/23/00 : beazley
          The "memberin" and "memberout" typemaps are gone for the
          moment, but they might return as soon as I figure out
          how to integrate them with some of the streamlined C wrapper
          functions.
          *** POTENTIAL INCOMPATIBILITY ***

7/22/00 : beazley
          A variety of old type handling functions such as print_type(),
          print_full(), print_mangle(), etc... are gone and have been
          replaced with a smaller set of functions.  See the file
          Doc/internals.html for details.  This will break all third
          party language modules.
          *** POTENTIAL INCOMPATIBILITY ***

7/20/00 : beazley
          Deprecated the %val and %out directives.  These directives
          shouldn't really be necessary since typemaps can be used
          to achieve similar results.   This also cleans up the
          handling of types and parameters quite a bit.
          *** POTENTIAL INCOMPATIBILITY ***

7/20/00 : ttn
	  Fixed unspecified-module bug in Guile support and removed
	  more non-"with-smobs" functionality using patches submitted
	  by Matthias Koeppe.

	  Re-enable recognition of "-with-smobs" (with no effect since
	  we use smobs by default now) for the time being.  After the
	  1.3a4 release, this option will signal an error.

7/17/00 : ttn
	  Fixed NULL-input bug in parameter list handling.
	  Reported by Matthias Koeppe.

7/12/00 : beazley
          Fixed memory leak in Python type-checking code. Reported by
          Keith Davidson.  Bug #109379.

7/10/00 : beazley
          Changed internal data structures related to function parameters.

7/10/00 : beazley
          Fixed some bugs related to the handling of the %name() directive
          and classes in the Tcl module. Problem reported by James Bailey.

7/10/00 : beazley
          Fixed parsing and enum handling problems with character constants.
          Reported by Greg Kochanski.

7/10/00 : beazley
          Removed WrapperFunction class from the core and updated the language
          module.  This will break third party modules.
          *** POTENTIAL INCOMPATIBILITY ***

7/9/00  : beazley
          Implementation of SWIG no longer makes use of C++ operator overloading.
          This will almost certainly break *all* third party language modules
          that are not part of the main SWIG CVS tree. Sorry.
          *** POTENTIAL INCOMPATIBILITY ***

7/8/00  : beazley
          Removed the experimental and undocumented "build" typemap that
          was intended to work with multiple arguments. Simply too weird
          to keep around.  Besides, a better replacement is in the works.

7/6/00  : ttn
          Removed non-"with-smobs" functionality (Guile support), i.e.,
          "-with-smobs" is now the default and no longer needs to be
	  specified on the command-line.

7/5/00  : ttn
          Incorporated Ruby support contributed by Masaki Fukushima.

6/28/00 : ttn
          Applied more-than-10-args bugfix patch contributed
	  by Matthias Koeppe.

6/27/00 : beazley
          Rewrote some of the string handling and eliminated the C++
          implementation (which is now just a wrapper).

6/27/00 : ttn
          Added Doc/index.html and Doc/internals.html.  The target
          audience for the latter is new SWIG developers.


Version 1.3 Alpha 3 (June 18, 2000)
===================================

6/18/00 : beazley
          Removed the naming.cxx, hash.cxx, and symbol.cxx files from
          the SWIG1.1 directory.   Continued to migrate things away
          from the C++ base (although there's still a lot of work to do).

6/17/00 : beazley
          Added a few more examples to the Examples directory.  Still
          need to do a lot of work on this.

6/16/00 : beazley
          Added -includeall to follow all #include statements in the
          preprocessor.

6/15/00 : beazley
          Tried to fix as many C++ warnings as possible when compiling
          with the Sun Workshop C++ compiler.  Unfortunately, this means
          that there are a lot of statements that contain string literals
          of the form (char*)"Blah".

6/15/00:  beazley
          A variety of cleanup and performance optimization in the
          low-level DOH library.   This seems to result in a speedup
          of 50-100% for preprocessing and other related tasks.

5/10/00 : ttn
	  Applied variable-wrapping bugfix patch contributed
	  by Matthias Koeppe.

4/17/00 : ttn
	  Updated MzScheme support contributed by Oleg Tolmatcev.
	  We now use a `Scheme_Type'-based structure to wrap pointers.

4/11/00 : ttn
	  Incorporated further Guile-support patch by Matthias Koeppe.
	  Typemaps previously deleted have been re-added.  There is now
	  exception handling (see Doc/engineering.html).  `SWIG_init' is now
	  declared extern only for simple linkage.  Some bugs were fixed.

4/06/00 : ttn
	  Incorporated MzScheme support contributed by Oleg Tolmatcev.
	  This includes new directories Lib/mzscheme and Examples/mzscheme.

4/03/00 : ttn
	  Added Examples/guile and children.  This is an adaptation of
	  the same-named directory from the SWIG-1.1p5 distribution.
	  Added Guile-specific section to Doc/engineering.html.

4/02/00 : ttn
	  Incorporated new guilemain.i by Martin Froehlich.
	  Incorporated Guile-support rewrite patch by Matthias Koeppe.
	  The command line option "-with-smobs" enables implementation of
	  pointer type handling using smobs, the canonical mechanism for
	  defining new types in Guile.  Previous implementation (using
	  strings) is at the moment still supported but deprecated.  At
	  some point, "-with-smobs" will be the default and no longer
	  required.

3/13/00 : beazley
          Added purify patches submitted by Ram Bhamidipaty.

3/02/00 : ttn
          Added support for different Guile "linkage" schemes.
	  Currently, "-Linkage hobbit" works.


Version 1.3 Alpha 2 (March 1, 2000)
===================================

2/29/00 : beazley
          Made SWIG ignore the 'mutable' keyword.

2/29/00 : beazley
          Incorporated some patches to the Perl5 module related to
          the -hide option and the destruction of objects.
          Patch submitted by Karl Forner.

2/27/00 : ttn
	  Incorporated Guile support contributed by Matthias Koeppe.
	  This includes a cpp macro in Lib/guile/guile.swg and the
	  entire file Lib/guile/typemaps.i.

2/25/00 : ttn
	  Modified configure.in and Makefile.in files to support
	  non-local build (useful in multi-arch environments).

2/24/00 : ttn
	  Incorporated Guile support contributed by Clark McGrew.
	  This works with Guile 1.3, but since it depends heavily
	  on the gh_ interface, it should work for all later versions.
	  It has not been tested with versions before 1.3.
	  WARNING: Code is unstable due to experimentation by ttn.

2/16/00 : beazley
          A variety of performance improvements to the Python shadow
          class code generation.  Many of these result in substantial
          runtime performance gains.  However, these have come at
          a cost of requiring the use of Python 1.5.2.  For older
          versions, use 'swig -noopt -python' to turn off these
          optimization features.

Version 1.3 Alpha 1 (February 11, 2000)
=======================================

2/11/00 : Added 'void' to prototype of Python module initializer.
          Reported by Mark Howson (1/20/00).

2/11/00 : beazley
          Modified the Python shadow class code to discard ownership of an
          object whenever it is assigned to a member of another object.
          This problem has been around for awhile, but was most recently
          reported by Burkhard Kloss (12/30/99).

2/11/00 : beazley
          Added braces around macros in the exception.i library.  Reported
          by Buck Hodges (12/19/99)

2/11/00 : beazley
          Fixed bug in the constraints.i library. Reported by Buck
          Hodges (12/14/99)

2/11/00 : beazley
          The %native directive now generates Tcl8 object-style command calls.
          A full solution for Tcl7 and Tcl8 is still needed. Patch suggested
          by Mike Weiblen (11/29/99)

2/11/00 : beazley
          Modified the typemap code to include the $ndim variable for arrays.
          Patch provided by Michel Sanner (11/12/99).

2/11/00 : beazley
          Modified the Python module to raise a Runtime error if an attempt
          is made to set a read-only member of a shadow class.  Reported by
          Michel Sanner (11/5/99).

2/10/00 : The documentation system has been removed. However, it is likely
          to return at some point in the future.

2/1/00  : Added a number of performance enhancements to the Python shadow
          classing and type-checking code.  Contributed by Vadim Chugunov.

          1. Remove _kwargs argument from the shadow wrappers when -keyword
             option is not specified. This saves us a construction of keyword
             dictionary on each method call.

             def method1(self, *_args, **_kwargs):
                 val = apply(test2c.PyClass1_method1, (self,) + _args, _kwargs)
                 return val

             becomes

             def method1(self, *_args):
                 val = apply(test2c.PyClass1_method1, (self,) + _args)
                 return val

          2. Incorporate self into the _args tuple.  This saves at least one tuple
             allocation per method call.

             def method1(self, *_args):
                 val = apply(test2c.PyClass1_method1, (self,) + _args)
                 return val

             becomes

             def method1(*_args):
                 val = apply(test2c.PyClass1_method1, _args)
                 return val

          3. Remove *Ptr classes.
             Assume that we are SWIGging a c++ class CppClass.
             Currently SWIG will generate both CppClassPtr class
             that hosts all methods and also CppClass that is derived
             from the former and contains just the constructor.
             When CppClass method is called, the interpreter will try
             to find it in the CppClass's dictionary first, and only then
             check the base class.

             CppClassPtr functionality may be emulated with:

             import new
             _new_instance = new.instance
             def CppClassPtr(this):
                  return _new_instance(CppClass, {"this":this,"thisown":0})

             This saves us one dictionary lookup per call.

             <DB>The new module was first added in Python-1.5.2 so it
             won't work with older versions.  I've implemented an
             alternative that achieves the same thing</DB>

          4. Use CObjects instead of strings for pointers.

          Dave: This enhancements result in speedups of up to 50% in some
          of the preliminary tests I ran.

2/1/00  : Upgraded the Python module to use a new type-checking scheme that
          is more memory efficient, provides better performance, and
          is less error prone. Unfortunately, it will break all code that
          depends on the SWIG_GetPtr() function call in typemaps.
          These functions should be changed as follows:

                if (SWIG_GetPtr(string,&ptr,"_Foo_p")) {
                    return NULL;
                }

          becomes

                if (SWIG_ConvertPtr(pyobj, &ptr, SWIG_TYPE_Foo_p) == -1) {
                    return NULL;
                }

          Note: In the new implementation SWIG_TYPE_Foo_p is no longer
          a type-signature string, but rather an index into a type
          encoding table that contains type information.
          *** POTENTIAL INCOMPATIBILITY ***

1/30/00 : loic
	  Conditionaly compile experimental code with --enable-experiment
	  configure flag.
	  Fix .cvsignore to ignore configrue & yacc generated files

1/28/00 : loic
	  Apply automake everywhere
	  Keep configure scripts so that people are not *forced* to autoconf
          Keep sources generated by yacc so that compilation without yacc
	  is possible.
	  Source/LParse/cscanner.c: change lyacc.h into parser.h to please
	  default yacc generation rules.
	  Use AC_CONFIG_SUBDIRS in configure.in instead of hand made script.
	  Update all relevant .cvsignore to include .deps
	  Fixed missing ; line 136 Source/Swig/swig.h

1/13/00 : beazley
          Fixed a number of minor end-of-file parsing problems in the
          preprocessor.

1/13/00 : beazley
          Added -freeze option that forces SWIG to freeze upon exit.
          This is only used as a debugging tool so that I can more
          easily examine SWIG's memory footprint.

1/13/00 : beazley
          Added patch to guile module for supporting optional arguments
          Patch contributed by Dieter Baron.

1/13/00 : loic
	  Added .cvsignore, Examples/.cvsignore, Source/DOH/Doh/.cvsignore
	  Source/SWIG1.1/main.cxx: Fixed -I handling bug
	  Source/Modules1.1/java.cxx: fixed char* -> const char* warnings that are
	  errors when compiling with gcc-2.95.2
	  Source/SWIG1.1/main.cxx: cast const char* to char* for String_replace
	  token and rep should really be const.

1/12/00 : beazley
          Added Harco's Java modules.

1/12/00 : beazley
          Revoked the %ifdef, %ifndef, %endif, %if, %elif, and %else
          directives.  These are no longer needed as SWIG now has a real
          preprocessor.
          *** POTENTIAL INCOMPATIBILITY ***

1/12/00 : beazley
          Moved the documentation modules from the SWIG directory
          to the Modules directory (where they really should have been
          to begin with).

1/12/00 : beazley
          Removed the -stat option for printing statistics. The
          statistics reporting was inadequate and mostly broken
          anyway.
          *** POTENTIAL INCOMPATIBILITY ***

1/12/00 : beazley
          Removed the -t option for reading a typemap file.  More
          trouble than it's worth.  Just include typemaps at the top
          of the interface file.
          *** POTENTIAL INCOMPATIBILITY ***

1/12/00 : beazley
          Removed the %checkout directive.
          *** POTENTIAL INCOMPATIBILITY ***

1/12/00 : beazley
          Removed the -ci option for file checkin.   Too problematic
          to implement.  Probably better to just put your SWIG library
          under CVS instead.
          *** POTENTIAL INCOMPATIBILITY ***.

1/11/00 : beazley
          Deleted the LATEX module.  Sorry... Didn't know anyone
          who was using it.  Besides, I'm looking to simplify
          the documentation system.
          *** POTENTIAL INCOMPATIBILITY ***

1/11/00 : beazley
          Modified the ASCII documentation module to use a .txt
          suffix for its output file instead of .doc.

1/11/00 : beazley
          Added the long-lost SWIG preprocessor back to the system.
          It should be enabled by default.  Raw preprocessed output
          can be viewed using swig -E file.i.
          *** NEW FEATURE ***

1/11/00 : beazley and djmitche
          Completely reorganized the SWIG directory structure.  The
          basic organization is now:

                Source/         SWIG source code
                Lib/            SWIG library files (swig_lib)
                Doc/            Documentation
                Examples/       Examples

          More directories will be added as needed.

12/08/99: Loic Dachary (loic@senga.org)
	  Enhanced package handling for perl5 and c++.

	  With new option -hide Foo::Bar, every perl5 object (Frob) is
	  qualified by Foo::Bar::Frob. The package name is solely used
	  to encapsulate C/C++ wrappers output in <module>_wrap.c and the
	  corresponding perl package in <module>.pm. Note that a package
	  name may contain :: (Frob::Nitz) and will be relative to the
	  package name provided by -hide (Foo::Bar::Frob::Nitz).

	  In *_wrap.c, SWIG_init macro is used. Was previously defined
	  but not used and simplifies code.

	  Added typemap(perl5,perl5in) and typemap(perl5,perl5out) that
	  do the equivalent of typemap(perl5,in) and typemap(perl5,out)
	  but contain perl code and applies to wrappers generated by
	  -shadow.

	  Lacking proper regression tests I used
	  Examples/perl5/{c++,constraint,defarg,except,
	  graph/graph[1234],multinherit,nested,shadow,simple,tree,
	  typemaps/{argv,argv2,arraymember,database,file,ignore,integer,
	  output,passref,reference,return}}/. I ran swig with and without
	  the patches, diff the generatedsources, run the .pl files
	  and checked that the results are identical. In all those examples
	  I had no error.

11/21/99: Modified the Tcl module to provide full variable linking capabilities
          to all datatypes.   In previous versions, a pair of accessor functions
          were created for datatypes incompatible with the Tcl_LinkVar() function.
          Now, we simply use variable traces to support everything. This may
          break scripts that rely upon the older behavior.
          *** POTENTIAL INCOMPATIBILITY ***

11/21/99: Added slight tweak to wrapper generator to collect local variables
          of similar type.  Produces somewhat more compact wrapper code.

11/20/99: Modified the Tcl module to use SWIG_GetArgs() to parse
          arguments.    This is a technique borrowed from Python in which
          arguments are converted using a format string convention similiar
          to fprintf().   This results in a *substantial* reduction in the
          size of the resulting wrapper code with only a modest runtime overhead
          in going through the extra conversion function.

11/13/99: Completely rewrote the class/structure generation code for the
          Tcl module.  Now, a small set of runtime functions are used
          to implement the functionality for all classes (instead of a
          massive amount of runtime code being generated for each class).
          Class specific information is simply encoded in a series of
          static tables.   This results in a *HUGE* reduction in wrapper
          code size--especially for C++.

11/13/99: Removed the -tcl (Tcl 7.x) module.  Tcl 8.0 is now several
          years old and the defacto standard--no real reason to keep
          supporting the old version at this point.

11/13/99: Cleaned up -c option for Python module.  The pyexp.swg file
          is now gone.

11/13/99: Fixed external declarations to work better with static linking
          on Windows.  Static linking should now be possible by defining
          the -DSTATIC_LINK option on the command line.  Patch contributed
          by Alberto Fonseca.

11/5/99 : Fixed an obscure code generation bug related to the generation
          of default constructors.   Bug reported by Brad Clements.

11/5/99 : Fixed a few memory problems found by purify.

11/5/99 : Officially deprecated the -htcl, -htk, and -plugin options
          from the Tcl and Tcl8 modules.

10/26/99: Removed unused variable from python/typemaps.i.  Patch
          contributed by Keith Davidson.

8/16/99 : Added _WIN32 symbol to libraries to better support Windows.

8/16/99 : Deprecated the Perl4 module.   It is no longer included in the
          distribution and no longer supported.  In the entire 3 years SWIG
          has been around I never received a single comment about it so I'm
          assuming no one will miss it...

8/16/99 : Modified the type-checking code to register type mappings using a
          table instead of repeated calls to SWIG_RegisterMapping().  This
          reduces the size of the module initialization function somewhat.

8/15/99 : Cleaned up the pointer type-checking code in the Tcl module.

8/15/99 : Many changes to the libraries to support runtime libraries.

8/13/99 : Eliminated C++ compiler warning messages about extern "C" linkage.

8/13/99 : Some cleanup of Python .swg files to better support runtime libraries
          on Windows.

8/13/99 : Modified the %pragma directive to attach pragmas declared inside
          a class definition to the class itself. For example:

               class foo {
                    ...
                    %pragma(python) addtomethod = "insert:print `hello world'"
                    ...
               }

          Most people don't need to worry about how this works.  For people
          writing backend modules, class-based pragmas work like this:

              lang->cpp_open_class()             // Open a class
              lang->cpp_pragma()                 // Supply pragmas
              ...                                // Emit members

              lang->cpp_close_class()            // Close the class

          All of the pragmas are passed first since they might be used to
          affect the code generation of other members.   Please see
          the Python module for an example.   Patches contributed
          by Robin Dunn.

8/13/99 : Patch to Python shadow classes to eliminate ignored
          exception errors in destructors.  Patch contributed
          by Robin Dunn.

8/11/99 : Minor patch to swig_lib/python/swigptr.swg  (added SWIGSTATIC
          declaration).  Patch contributed by Lyle Johnson.

8/11/99 : Added FIRSTKEY/NEXTKEY methods to Perl5 shadow classes
          Patch contributed by Dennis Marsa.

8/11/99 : Modified Python module so that NULL pointers are returned
          and passed as 'None.'  Patch contributed by Tal Shalif.

8/10/99 : Fixed missing 'int' specifiers in various places.

8/10/99 : Added Windows makefile for Runtime libraries.  Contributed
          by Bob Techentin.

8/10/99 : Fixed minor problem in Python runtime makefile introduced
          by keyword arguments.

8/8/99  : Changed $target of perl5(out) typemap from ST(0) to
          ST(argvi).  Patch contributed by Geoffrey Hort.

8/8/99  : Fixed bug in typemap checking related to the ANY keyword
          in arrays and ignored arguments.  Error reported by
          Geoffrey Hort.

8/8/99  : %enabledoc and %disabledoc directives can now be used
          inside class/structure definitions.   However, no check
          is made to see if they are balanced (i.e., a %disabledoc
          directive inside a class does not have to have a matching
          %enabledoc in the same class).

8/8/99  : Keyword argument handling is now supported in the Python
          module.   For example:

               int foo(char *bar, int spam, double x);

          Can be called from Python as

               foo(x = 3.4, bar="hello", spam=42)

          To enable this feature, run SWIG with the '-keyword' command
          line option.    Mixing keyword and default arguments
          should work as well.   Unnamed arguments are assigned names
          such as "arg1", "arg2", etc...

          *** POTENTIAL INCOMPATIBILITY ***
          Functions with duplicate argument names such as
          bar(int *OUTPUT, int *OUTPUT) will likely cause problematic
          wrapper code to be generated.   To fix this,  use different
          names or use %apply to map typemaps to alternate names.

8/8/99  : Handling of the 'this' pointer has been changed in Python shadow
          classes.  Previously, dereferencing of '.this' occured in the
          Python shadow class itself.   Now, this step occurs in the C
          wrappers using the following function:

                SWIG_GetPtrObj(PyObject *, void **ptr, char *type)

          This function can accept either a string containing a pointer
          or a shadow class instance with a '.this' attribute of
          appropriate type.  This change allows the following:

          1.  The real shadow class instance for an object is
              passed to the C wrappers where it can be examined/modified
              by typemaps.

          2.  Handling of default/keyword arguments is now greatly
              simplified.

          3.  The Python wrapper code is much more simple.

          Plus, it eliminated more than 300 lines of C++ code in the
          Python module.

          *** CAVEAT : This requires the abstract object interface.
          It should work with Python 1.4, but probably nothing older
          than that.


8/8/99  : Fixed handling of "const" and pointers in classes.  In particular,
          declarations such as

           class foo {
             ...
             const char *msg;
             const int  *iptr;
          }

          are handled as assignable variables as opposed to constant
          values (this is the correct behavior in C/C++).   Note:
          declarations such as "char *const msg" are still unsupported.
          Constants declared at the global level using const are also
          broken (because I have a number of interfaces that rely upon
          this behavior).

          *** POTENTIAL INCOMPATIBILITY ***  This may break interfaces that
          mistakenly treat 'const char *' types as constant values.

8/8/99  : Modified the parser to support bit-fields.    For example:

          typedef struct {
              unsigned int is_keyword : 1;
              unsigned int is_extern  : 1;
              unsigned int is_static  : 1;
          } flags;

          Bit-fields can only be applied to integer types and their
          are other restrictions.  SWIG performs no such type-checking
          (although the C compiler will catch problems when it tries to
          compile the wrapper code).

8/8/99  : Removed trailing space of $basetype substitution in typemaps.
          This is to allow things like this:

          %typemap(python, argout) spam** OUTPUT{
              ...
              char* a = "$basetype_p";
              ...
          }

          (Patch suggested by Nathan Dunfield).

6/22/99 : Made a very slight tweak to the Perl5 shadow class
          code that allows typemaps to alter the return type
          of objects (to support polymorphic types).  Patch
          contributed by Drake Diedrich.

4/8/99  : Fixed null pointer handling bug in Perl module.
          Patch contributed by Junio Hamano.

3/17/99 : Fixed bug in perl5ptr.swg for ActiveState Perl.
          Patch contributed by Greg Anderson.

2/27/99 : Eliminated segmentation fault when Swig runs on
          empty files.

2/27/99 : Added patch to Guile module to eliminate unused
          variables.   Contributed by Mike Simons.

2/27/99 : Fixed problem with %addmethods returning references.

2/27/99 : Fixed Runtime/Makefile. Patch contributed by
          Mike Romberg.

2/27/99 : Incorporated patches to the type-checker.

2/27/99 : Fixed problem with -exportall switch and shadow classes
          in Perl5 module.  Patch contributed by Dennis Marsa.

2/27/99 : Modified Perl5 module to recognize 'undef' as a NULL char *.
          Patch contributed by Junio Hamano.

2/27/99 : Fixed the Perl5 module to support the newer versions of
          ActiveState Perl for Win32.

2/27/99 : Fixed the include order of files specified with the
          -I option.

2/5/98- : Dave finishes his dissertation, goes job hunting, moves to
2/5/99    Chicago and generally thrashes about.

Version 1.1 Patch 5 (February 5, 1998)
======================================
2/4/98  : Fixed a bug in the configure script when different package
          locations are specified (--with-tclincl, etc...).

2/2/98  : Fixed name-clash bug related to the switch to C macros for accessor
          functions.  The new scheme did not work correctly for objects
          with members such as 'obj', 'val', etc...   Fixed the bug by
          appending the word 'swig' to macro argument names.  Patch
          contributed by Rudy Albachten.

2/2/98  : Slight fix to the Perl5 module to eliminate warning messages
          about 'varname used only once : possible typo'.  Fix
          contributed by Rudy Albachten.

1/9/98  : Fixed a bug in the Perl 5 module related to the creation of
          constants and shadow classes.

1/9/98  : Fixed linking bug with Python 1.5 embed.i library file.

Version 1.1 Patch 4 (January 4, 1998)
=====================================

1/4/98  : Changed structured of the Examples directory to be more friendly
          to Borland C++.

1/4/98  : Added the function Makefile.win.bc for compiling the examples
          under Borland 5.2.

1/4/98  : Slight change to the perl5 module and C++ compilation.  The
          <math.h> library is now included before any Perl headers
          because Perl the extern "C" linkage of math.h screws alot
          of things up (especially on Windows).

1/2/98  : Change to the Python module that reduces the number of constants
          created by C++ classes, inheritance, and shadow classes.   This
          modification may introduce a few slight incompatibilities if
          you attempt to use the non-shadow class interface with shadow
          classes enabled.    Patch contributed by Mike Romberg.

1/2/98  : Support for Tcl 8.0 namespaces has been added.   This *replaces*
          the original SWIG mechanism that assumed [incr Tcl] namespaces.
          To use namespaces, simply run SWIG with the following options

             swig -tcl -namespace  foo.i

                    This places everything in a namespace that matches
                    the module name

             swig -tcl -namespace -prefix bar foo.i

                    This places everything in the namespace 'bar'

          The use of namespaces is new in Tcl 8.0.  However, the wrapper code
          generated by SWIG will still work with all versions of Tcl newer
          than and including Tcl 7.3/Tk3.6 even if the -namespace option is
          used.

          *** POTENTIAL INCOMPATIBILITY ***
          This change may break existing applications that relied on the
          -prefix and -namespace options.

1/2/98  : Added the following constants to the Tcl wrapper code

                 SWIG_name      - Name of the SWIG module
                 SWIG_prefix    - Prefix/namespace appended to command names
                 SWIG_namespace - Name of the namespace

          SWIG library writers can use these to their advantages.

1/2/98  : Fixed a bug in the Tcl8 module related to the creation of
          pointer constants (the function SWIG_MakePtr was missing from
          the wrapper code).

1/2/98  : Added the consthash.i library file to the Tcl and Tcl8 modules.

1/1/98  : Changed and cleaned up the Python typemaps.i file.   The following
          significant changes were made :

                1.  The OUTPUT typemap now returns Python tuples instead of
                    lists.   Lists can be returned as before by using the
                    L_OUTPUT type.    If compatibility with older versions
                    is needed, run SWIG with the -DOUTPUT_LIST option.

                2.  The BOTH typemap has been renamed to INOUT.  For backwards
                    compatibility, the "BOTH" method still exists however.

                3.  Output typemaps now generate less code than before.

          Changes to typemaps.i may break existing Python scripts that assume
          output in the form of a list.
          *** POTENTIAL INCOMPATIBILITY ***

12/31/97: Fixed long overdue problems with the testing scripts and certain
          makefiles that required the use of the bash shell.   Everything should
          work properly with the standard Bourne shell (sh) now.

12/31/97: Modified typemaps to allow $basetype as a valid local variable.
          This allows for all sorts of bizarre hackish typemaps that
          do cool things.   Patch contributed by Dominique Dumont.

12/31/97: Switched accessor functions generated for member data to
          C preprocessor macros (except in cases involving typemaps
          or char *).

12/31/97: Fixed a bug related to C++ member data involving references.

12/31/97: Changed accessor functions for C++ member functions to
          preprocessor macros.   This cleans up the wrapper code
          and results in fewer function definitions.

12/31/97: Changed the default C constructor to use calloc() instead
          of malloc()

12/30/97: Changed the creation of constants in the Perl5 module.
          For all practical purposes, they should work in exactly the
          same way as before except that they now require much less
          wrapper code.   Modules containing large numbers of
          constants may see greater than a 50% reduction in wrapper
          code size.

12/30/97: Modified the Python module to be more intelligent about the
          creation of constants.  SWIG no longer generates redundant
          global variables and the size of the module initialization
          function should be reduced.   (Many thanks to Jim Fulton).

12/29/97: Fixed a bug in C++ code generation related to member functions,
          default arguments, and references.

12/29/97: Fixed configure script and a few makefiles to support Python 1.5

12/29/97: Added 'embed15.i' library file.  This file should be used to
          staticly link versions of Python 1.5.    To make it the default,
          simply copy 'swig_lib/python/embed15.i' to 'swig_lib/python/embed.i'

Version 1.1 Patch 3 (November 24, 1997)
========================================

11/23/97: Fixed a bug in the Perl5 module with shadow classes and
          static class functions that return class instances.
          Note : The fix for this bug requires a slight restructuring of
          of the .pm files created by SWIG.

11/23/97: Fixed a bug in the Tcl/Tcl8 modules related to variable linking
          of character arrays.  If you declared a global variable 'char foo[10]',
          the generated wrapper code would either cause a segmentation fault
          immediately upon loading or weird memory corruption elsewhere.
          This should now be fixed although character arrays can only be
          read-only.

11/23/97: Fixed a bug with the %import directive that caused it to
          fail if files were imported from directories other than
          the current working directory.

11/23/97: Fixed incorrect diagnostic message in the ASCII documentation
          module.

11/23/97: Changed the behavior of the -o option when used with shadow
          classes. If -o was used to specify both the pathname and filename
          of SWIG's output such as

                 swig -o /home/swig/wrapper.c -shadow -perl5 foo.i

          The wrapper code would be placed the file specified with -o,
          but the .pm file and documentation would be placed in the
          directory where SWIG was run.   Now, these files are placed
          in the same directory as the file specified with the -o option.
          This change is also needed for proper operation on the
          Macintosh.

11/23/97: Added a 'this()' method to Perl5 shadow classes.   This can
          be used to return the normal pointer value from a shadow
          class that is represented as a tied hash.   To use just
          invoke as a method like this :

              $l = new List;       # Create an object
              $ptr = $l->this();   # Get the normal pointer value

          *** NEW FEATURE ***

11/23/97: Fixed the Tcl 8 pointer.i library file (which was completely
          broken in 1.1p2).

11/23/97: Modified the Perl5 type-checker to fix a few problems
          with global variables of pointer types and to allow
          tied hashes to be used interchangably with normal
          pointer values.

11/23/97: Modified the typemap mechanism to allow output
          typemaps of type 'void'.   These were ignored previously,
          but now if you specify,

                %typemap(lang,out) void {
                      ... return a void ...
                }

          You can change or assign a return value to the function.

11/23/97: Fixed processing of 'bool' datatypes in the Python module.

11/23/97: Fixed minor parsing error with C++ initializers. For example,

                 class B : public A {
                 public:
                       B() : A() { ... };
                       ...
                 }

11/23/97: Fixed the Tcl8 module so that C functions that call back into
          Tcl don't corrupt the return result object (SWIG was gathering
          the result object too early which leads to problems if subsequent
          Tcl calls are made).

11/23/97: Fixed a code generation bug in the Python module when two or
          more output parameters were used as the first arguments of a
          function.  For example :

                 %include typemaps.i
                 void foo(double *OUTPUT, double *OUTPUT, double a);

          Previously, doing this resulted in the creation of an
          extraneous comma in the output, resulting in a C syntax error.

11/22/97: Fixed a bug when template handling that was stripping whitespace
          around nested templates.   For example :

                 Foo<Bar<double> >

          was getting munged into Foo<Bar>> which is a syntax error in
          in the C++ compiler.

11/22/97: Fixed bugs in the Borland C++ makefiles.

11/22/97: Fixed memory corruption bug when processing integer
          arguments in Tcl8 module.

11/21/97: Fixed a bug in the Runtime/Makefile related to Tcl 8.

11/21/97: Fixed a bug with the %new directive and Perl5 shadow classes.
          No longer generates a perl syntax error.

11/9/97 : Changed a strncpy() to strcpy() in the pointer type-checker.
          This results in a substantial performance improvement in
          type-checking.

10/29/97: Fixed a bug in the code generation of default arguments and
          user-defined types.  For example :

                 void foo(Vector a, Vector b = d);

          should now work properly.

Version 1.1 Patch 2 (September 4, 1997)
=======================================
9/4/97  : Fixed problem with handling of virtual functions that
          was introduced by some changes in the C++ module.

Version 1.1 Patch 1 (August 27, 1997)
=====================================

8/26/97 : Fixed compilation and run-time bugs with Tcl 8.0 final.

8/21/97 : Fixed code generation bug with arrays appearing as arguments
          to C++ member functions.  For example :

                class Foo {
                public:
                      void Bar(int a[20][20]);
                };

          There is still a bug using arrays with added methods
          however.

8/20/97 : Fixed a bug with generating the code for added methods
          involving pass-by-value.

8/19/97 : Modified the typemapper to substitute the '$arg' value
          when declaring local variables.    For example :

              %typemap(in) double * (double temp_$arg) {
                    ... do something ...
              }

          When applied to a real function such as the following :

              void foo(double *a, double *b, double *result);

          three local variables will be created as follows :

              double temp_a;
              double temp_b;
              double temp_result;

          This can be used when writing multiple typemaps that need
          to access the same local variables.


7/27/97 : Fixed a variety of problems with the %apply directive and arrays.
          The following types of declarations should now work :

               %apply double [ANY] { Real [ANY] };
               %apply double [4] { double [10] };

          A generic version of apply like this :

               %apply double { Real };

          should now work--even if arrays involving doubles and Reals are
          used later.

7/27/97 : Changed warning message about "Array X has been converted to Y" to
          only appear if running SWIG in verbose mode.

7/27/97 : Added the variables $parmname and $basemangle to the typemap
          generator.    $parmname is the name of the parameter used
          when the typemap was matched.  It may be "" if no parameter
          was used.   $basemangle is a mangled version of the base
          datatype.    Sometimes used for array handling.

7/27/97 : Changed the behavior of output arguments with Python shadow classes.
          Originally, if a function returned an object 'Foo', the shadow class
          mechanism would create code like this :

                def return_foo():
                      val = FooPtr(shadowc.return_foo())
                      val.this = 1
                      return val

          The problem with this is that typemaps allow a user to redefine
          the output behavior of a function--as a result, we can no longer
          make any assumptions about the return type being a pointer or
          even being a single value for that matter (it could be a list,
          tuple, etc...).   If SWIG detects the use of output typemaps
          (either "out" or "argout") it returns the result unmodified like
          this :

                def return_foo():
                      val = shadowc.return_foo()
                      return val

          In this case, it is up to the user to figure out what to do
          with the return value (including the possibility of converting it
          into a Python class).

7/26/97 : Fixed a parsing problem with types like 'unsigned long int',
          'unsigned short int', etc...

7/24/97 : Minor bug fix to Tcl 8 module to parse enums properly.  Also
          fixed a memory corruption problem in the type-checker.
          (patch contributed by Henry Rowley.

7/24/97 : Added Python-tuple typemaps contributed by Robin Dunn.

7/24/97 : Incorporated some changes to the Python module in support of
          Mark Hammond's COM support.  I'm not entirely sure they
          work yet however.  Needs documentation and testing.

7/24/97 : Fixed code generation bugs when structures had array members
          and typemaps were used.  For example :

              %typemap(memberin) double [20][20] {
                      ... get a double [20][20] ...
              }
              struct Foo {
                     double a[20][20];
              }

          Originally, this would generate a compiler-type error when
          the wrapper code was compiled.   Now, a helper function like
          this is generated :

                double *Foo_a_set(Foo *a, double val[20][20]) {
                         ... memberin typemap here ...
                         return (double *) val;
                }

          When writing typemaps, one can assume that the source variable
          is an array of the *same* type as the structure member. This
          may break some codes that managed to work around the array bug.
          *** POTENTIAL INCOMPATIBILITY ***

7/13/97 : Fixed bug in Perl5 module when using C global variables that
          are pointers.  When used in function calls and other operations,
          the value of the pointer would be invalid---causing core
          dumps and other problems.  SWIG implements global variables
          using Perl magic variables.  As it turns out, the error
          was caused by the fact that the pointer-extraction code
          was somehow bypassing the procedure used to resolve magical
          variables (hence, leaving the value undefined).  To fix
          the problem, SWIG now explicitly resolves magic before
          extracting pointer values.

7/12/97 : Eliminated the last remnants of free() and malloc() from
          the SWIG compiler.

7/12/97 : Fixed parsing problems with typemaps involving arrays and
          temporary variables of arrays.    Also made it possible for
          SWIG to handle typemaps like this :

                 %typemap(in) double [ANY] (double temp[$dim0]) {
		      ... store data in temp[$dim0] ...
                 }

          Not only does this typemap match any double [] array, it
          creates a local variable with precisely the right dimensions.
          (ie. $dim0 gets filled in with the real number of dimensions).
          Of course, off the record, this will be a way to add more
          functionality to the typemaps.i libraries.

7/9/97  : Fixed some problems with Perl5, static linking, and shadow
          classes.  When statically linking multiple modules together, write
          a top-level interface file like this when shadow classes are not
          used :

                 %module swig, foo, bar, glob;
                 %include perlmain.i

          When shadow classes are used, the module names have an extra 'c'
          appended so it should read as :

                 %module swig, fooc, barc, globc;
                 %include perlmain.i

          When linking multiple modules, consider using the SWIG runtime
          library.

7/8/97  : Incorporated fixed versions of the Borland C++ Makefiles.

7/8/97  : First cut at trying to eliminate excessive compiler warnings.
          As it turns out, alot of warnings go away if you just make
          declarations like this

                  clientData = clientData;

          in the resulting wrapper code.  Most compilers should just
          ignore this code (at least would can hope).

7/8/97  : Fixed bizarre code generation bug with typemaps and C++ classes.
          In some cases, typemaps containing printf formatting strings such as

                  %typemap(memberout) int * {
                         printf("%d",42);
                  }

          Would generate completely bogus code with garbage replacing
          the '%d'.   Caused by one faulty use of printf (wasn't able to find
          any other occurences).

7/7/97  : Fixed bug in Python shadow class generation with non-member
          functions that are returning more than one value.

7/7/97  : Incorporated modifications to make SWIG work with Guile 1.2.
          Still need to test it out, but it is rumored to work.

7/2/97  : Fixed some bugs related to output arguments and Python shadow
          classes.    If an output argument is detected, SWIG assumes
          that the result is a list and handles it appropriately.
          If the normal return type of an function is an object,
          it will be converted into a shadow class as before, but
          with the assumption that it is the first element of a
          list.  *** NOTE : This behavior has been subsequently changed ***

6/29/97 : Changed EXPORT to SWIGEXPORT in all of the language modules.
          Should provide better compatibility with Windows.

6/29/97 : Modified Python shadow classes so that output arguments
          work correctly (when typemaps are used).

Version 1.1 (June 24, 1997)
===========================

6/24/97 : Fixed Objective-C constructor bug when working with Perl5
          shadow classes.

6/23/97 : Fixed some parsing problems with Objective-C.  Declarations
          such as the following should work now :

               - foo : (int) a with: (int) b;

6/22/97 : Added SWIG Runtime library.   This library contains
          the SWIG pointer type-checker and support functions
          that are normally included in every module.  By using
          the library, it is easier to work with multiple SWIG
          generated modules.

6/22/97 : Fixed minor bug in Perl5 module related to static linking
          of multiple modules.

6/22/97 : Fixed some bugs with the %import directive. When used with
          Perl5 shadow classes, this generates a 'require' statement
          to load in external modules.

6/22/97 : Added -swiglib option.  This prints out the location of the
          SWIG library and exits.  This option is only really useful to
          configuration tools that are looking for SWIG and its library
          location (e.g. autoconf, configure, etc...).

6/21/97 : Fixed export bug with Perl5.004 on Windows-NT.

6/20/97 : Minor change to code generation of class/structure members in
          order to work better with typemaps. Should have no noticable
          impact on existing SWIG modules.

6/19/97 : Added -t option. This allows SWIG to load a typemap file before
          processing any declarations.  For example :

                 swig -t typemaps.i -python example.i

          At most, only one typemap file can be specified in this manner.
          *** NEW FEATURE ***

6/18/97 : Need a Makefile fast? Type

                 swig [-tcl, -perl5, -python] -co Makefile

          and you will get a Makefile specific to that target language.
          You just need to modify it for your application and you're
          ready to run.

6/18/97 : Completed the -ci option.  This option checks a file into the
          SWIG library.   It should be used in conjunction with a
          language option. For example :

                  swig -tcl -ci foobar.i

          Checks the file foobar.i into the Tcl part of the library.
          In order to check a file into the general library (accessible
          to all languages modules), do the following

                  swig -ci -o ../foobar.i foobar.i

          (Admittedly this looks a little strange but is unavoidable).
          The check-in option is primarily designed for SWIG maintenance
          and library development. The command will fail if the user does
          not have write permission to the SWIG library.  Third party library
          extensions can easily install themselves by simply providing
          a shell script that uses 'swig -ci' to install the appropriate
          library files.  It is not necessary to know where the SWIG library
          is located if you use this mechanism.
          *** NEW FEATURE ***

6/16/97 : Fixed a bug in shadow class generation when %name() was applied
          to a class definition.   Unfortunately, fixing the bug required
          a change in the Language C API by adding an extra argument to
          the Language::cpp_class_decl() function.  This may break
          SWIG C++ extensions.
          *** POTENTIAL INCOMPATIBILITY ***

6/15/97 : Added a warning message if no module name is specified with the
          %module directive or -module option.

6/15/97 : Fixed line number bug when reporting errors for undefined
          base classes.

6/15/97 : Added new %rename directive.  This allows the forward declaration
          of a renaming.  For example :

                 %rename OldName NewName;

                 .... later ...
                 int OldName(int);

          Unlike %name, %rename will rename any occurence of the old name.
          This applies to functions, variables, class members and so forth.
          There is no way to disable %rename once set, but you can change the
          name by redeclaring it to something else.
          *** NEW FEATURE ***

6/15/97 : Improved the implementation of the %name directive so that it
          could be used with conditional compilation :

                    #ifdef SWIG
                    %name(NewName)
                    #endif
                    int OldName(int);

6/15/97 : Added support for functions with no return datatype.  In this case,
          SWIG assumes a return type of 'int'.

6/11/97 : Improved error reporting in the parser.  It should be a little
          less sensitive to errors that occur inside class definitions
          now.  Also reports errors for function pointers.

6/11/97 : Made '$' a legal symbol in identifiers.  This is to support
          some Objective-C libraries.  Some compilers (such as gcc) may also
          allow identifiers to contain a $ in C/C++ code as well (this is
          an obscure feature of C). When '$' appears in identifier, SWIG
          remaps it to the string '_S_' when creating the scripting language
          function. Thus a function 'foo$bar' would be called 'foo_S_bar'.

6/11/97 : Fixed bug in Python shadow classes with __repr__ method.  If
          supplied by the user, it was ignored, but now it should work.

6/9/97  : Fixed the Tcl 8.0 module to work with Tcl 8.0b1.   SWIG is no
          longer compatible with *any* alpha release of Tcl 8.0.
          *** POTENTIAL INCOMPATIBILITY ***

6/7/97  : Put a maximal error count in (currently set to 20). SWIG will bail out
          if it generates more errors than this (useful for preventing SWIG
          from printing 4000 syntax errors when it gets confused).

6/7/97  : Fixed segmentation fault when parsing variable length arguments.

6/7/97  : Minor change to Perl5 module.  C++ static functions are now
          put in the same package as their class when using shadow classes.

6/7/97  : Centralized the naming of functions, members, wrappers etc... By
          centralizing the naming scheme, it should be possible to make
          some multi-file optimizations.  Also, it should be possible to
          change SWIG's naming scheme (perhaps a new feature to be added
          later).

6/2/97  : Added 'arginit' typemap.   This can be used to assign initial values
          to function arguments.  Doing so makes it somewhat easier to detect
          improper argument passing when working with other typemaps.

6/2/97  : Fixed code generation bug when read-only variables were inherited
          into other classes.  Under inheritance, the variables would
          become writable, but this has now been corrected.

5/30/97 : An empty %name() directive is no longer allowed or supported.
          This directive was originally used to strip the prefix
          off of a class or structure.  Unfortunately, this never really
          seemed to work right and it complicated the C++ code generator
          significantly.   As far as I can tell no one uses it, so it
          is now history.  *** POTENTIAL INCOMPATIBILITY ***

5/28/97 : Fixed a parsing bug with #define and C++ comments.  Declarations
          such as the following now work properly :

                   #define CONST   4     // A Comment

5/28/97 : Made some performance improvements to the SWIG String class.
          (only affects the SWIG compiler itself).

5/28/97 : Modified the parser to skip template definitions and issue a
          warning message.

5/28/97 : Preliminary support for parameterized types added (ie. templates).
          Types such as the following should pass through the SWIG compiler

                    void foo(vector<complex> *a, vector<double> *b);

          When used, the entire name 'vector<complex>' becomes the name
          of the datatype.      Due to space limitations in datatype
          representations, the name should not exceed 96 characters.

          Note : This is only part of what is needed for template support.
          Template class definitions are not yet supported by SWIG.

          The template notation above may also be used when specifying
          Objective-C protocol lists.
          *** NEW FEATURE ***

5/24/97 : First cut at Objective-C support added.   As it turns out, almost
          everything can be handled with only a few minor modifications to
          the C++ module.
          *** NEW FEATURE ***

5/23/97 : Fixed repeated definition bug in multiple inheritance handling
          when multiple base classes share a common base class (ie.
          the evil diamond).

5/21/97 : Fixed rather embarrassing typo that worked its way into the
          Tests/Build directory.

5/19/97 : Fixed code generation bug when using native methods and
          shadow classes with Python and Perl5 modules.

5/19/97 : Modified the %apply directive slightly so that it would work
          with pointers a little better. For example :

                  %apply unsigned long { DWORD };

          Applies *all* typemaps associated with "unsigned long" to
          "DWORD".   This now includes pointers to the two datatypes.
          For example, a typemap applied to "unsigned long **" would
          also be applied to any occurrence of "DWORD **" as well.

5/19/97 : Fixed an ownership assignment bug in the Perl5 module when
          class members were returning new objects belonging to
          different classes.

5/17/97 : Added a few more typemap variables.

                  $name          - Name of function/variable/member
                  $basetype      - Base datatype (type without pointers)
                  $argnum        - Argument number

5/16/97 : Fixed embarrassing underscore error in local variable
          allocator.

5/16/97 : Fixed namespace clash bug in parameterized typemaps
          when creating arrays as new local variables.

5/15/97 : Fixed some bugs with inheritance of added methods across
          multiple files.   SWIG now uses names of base classes
          when generating such functions.

5/14/97 : Finished support for default typemaps.  Primarily used
          internally, they can be used to match the basic
          built-in datatypes used inside of SWIG.   You can
          specify them in interface files as well like this :

               %typemap(tcl,in) int SWIG_DEFAULT_TYPE {
                        $target = atoi($target);
               }

          Unlike normal typemaps, this default map will get applied
          to *all* integer datatypes encountered, including those
          renamed with typedef, etc...

5/13/97 : Fixed substring bug in type checker.

5/12/97 : Fixed bug in parameterized typemaps when declaring local
          variables of structures.

Version 1.1 Beta6 (May 9, 1997)
===============================

5/9/97  : Fixed bizarre NULL pointer handling bug in Perl5 module.

5/8/97  : Fixed mysterious segmentation fault when running SWIG on an
          empty file.

5/7/97  : The code generator will now replace the special symbol "$cleanup"
          with the cleanup code specified with the "freearg" typemap.
          This change needed to properly manage memory and exceptions.

5/5/97  : Added the 'typemaps.i' library file.  This contains a
          variety of common typemaps for input values, pointers,
          and so on.

5/5/97  : Changed behavior of "argout" typemap in Python module.
          Old versions automatically turned the result into a
          Python list.  The new version does nothing, leaving the
          implementation up to the user.  This provides more flexibility
          but may break older codes that rely on typemaps.
          *** POTENTIAL INCOMPATIBILITY ***

5/5/97  : Fixed bug in Python module related to the interaction of
          "argout" and "ignore" typemaps.

5/5/97  : Fixed bug in Python module that would generate incorrect code
          if all function arguments are "ignored".

5/4/97  : Added %apply and %clear directives.   These form a higher level
          interface to the typemap mechanism.  In a nutshell, they
          can be used to change the processing of various datatypes without
          ever having to write a typemap.  See the SWIG documentation
          for more details.  ** NEW FEATURE **

5/4/97  : Added a local variable extension to the typemap handler.
          For example :

                 %typemap(tcl,in) double *(double temp) {
		        temp = atof($source);
                        $target = &temp;
                 }

          In this case, 'temp' is a local variable that exists
          in the entire wrapper function (not just the typemap
          code).  This mechanism provides better support for
          certain types of argument handling and also makes it
          possible to write thread-safe typemaps.  Any number
          local variables can be declared by supplying a comma
          separated list.   Local variables are guaranteed to be
          unique, even if the same typemap is applied many times
          in a given function.
          ** Not currently supported in Perl4 or Guile modules.

5/2/97  : Fixed processing of %ifdef, %endif, %if, etc...  (These are
          SWIG equivalents of the C preprocessor directives that
          can pass through the C preprocessor without modification).

5/2/97  : Fixed major (but subtle) bug in the run-time type checker
          related to searching and type-checking for C++ inheritance.
          To make a long story short, if you had two classes named
          "Foo" and "FooObject" the type checker would sometimes
          get confused and be unable to locate "Foo" in an internal
          table.

5/2/97  : Fixed some bugs in the -co option.

4/24/97 : Pointer library added to the SWIG library.

4/19/97 : Added the %new directive.   This is a "hint" that can be used
          to tell SWIG that a function is returning a new object. For
          example :

                  %new Foo *create_foo();

          This tells SWIG that create_foo() is creating a new object
          and returning a pointer to it.   Many language modules may
          choose to ignore the hint, but when working with shadow classes,
          the %new is used to handle proper ownership of objects.

          %new can also be used with dynamically allocated strings.
          For example :

                  %new char *create_string();

          When used, all of the language modules will automatically cleanup
          the returned string--eliminating memory leaks.
          ** NEW FEATURE **

4/19/97 : Added a new typemap "newfree".   This is used in conjunction with
          the %new directive and can be used to change the method by which
          a new object returned by a function is deleted.

4/19/97 : The symbol "__cplusplus" is now defined in the SWIG interpreter
          when running with the -c++ option.

4/17/97 : Added support for static member functions when used inside the
          %addmethods directive.

4/15/97 : Added a special typemap symbol PREVIOUS that can be used to
          restore a previous typemap. For example :

	         %typemap(tcl,in) int * = PREVIOUS;

          This is primarily used in library files.

4/13/97 : Added %pragma directive for Perl5 module.   Two new pragmas are
          available :

                 %pragma(perl5) code = "string"
                 %pragma(perl5) include = "file.pl"

          Both insert code into the .pm file created by SWIG.  This can
          be used to automatically customize the .pm file created by SWIG.

4/13/97 : Scanner modified to only recognize C++ keywords when the -c++
          option has been specified.  This provides support for C programs
          that make use of these keywords for identifiers.
          SWIG may need to be explicitly run with the -c++ option when
          compiling C++ code (this was allowed, but not recommended in
          previous versions). **POTENTIAL INCOMPATIBILITY**

4/11/97 : Fixed a rather nasty bug in the Perl5 module related to using
          variable linking with complex datatypes and pointers.   On Unix,
          code would work (somehow), but would cause an access violation
          under Windows-NT.  The fix should correct the problem,
          but there may still be a problem using global variables of
          complex datatypes in conjunction with shadow classes.  Fortunately,
          this sort of thing seems to be relatively rare (considering
          that the bug has been around for more than a year - yikes!).

4/11/97 : Fixed bizarre constant evaluation bug in Perl5 code generation
          when running under Windows-NT.

4/8/97  : Bug when using default arguments and C++ references fixed.

4/8/97  : Fixed code generation bugs in Python and Perl5 modules related to
          using class renaming (applying the %name directive to a class
          definition) and shadow classes.

4/7/97  : Fixed minor bugs in swigptr.swg, tcl8ptr.swg, and perl5ptr.swg to
          prevent infinite loops when weird datatypes are passed.

3/29/97 : 'Makefile.win' added.   This is used to build most of the examples
          in the Examples directory under Windows NT/95.

3/27/97 : Fixes to SWIG's error return codes.   SWIG now returns non-zero
          exit codes for certain kinds of errors (which makes it more
          friendly to makefiles).     An overhaul of the error handling
          is on the to-do list and will probably show up in a later release.

3/25/97 : Bug fix.  "freearg" and "argout" typemaps have been fixed in
          the Perl5 module.  In previous versions, function input parameters
          and function output parameters shared the same memory space--causing
          all sorts of nasty problems when trying to pass perl values by
          reference.   SWIG now internally makes a "copy" (which is really
          just a pointer) of affected parameters and uses that.   This
          is done transparently so there is no noticable impact on any
          SWIG generated modules.   This change is probably only noticable
          to expert users.

3/25/97 : Added type-check to verbose and stat mode.  SWIG will now generate a list
          of all datatypes that were used but undefined (useful for tracking
          down weird bugs).   This is enabled with the -v option (which
          is now officially known as "overly verbose" mode) or the -stat option.

3/25/97 : Slight change to the parser to make include guards work correctly.
          For example :

                #ifndef INTERFACE_I
                #define INTERFACE_I
                %module foobar.i
                ... declarations ...
                #endif

3/24/97 : %checkout directive added.   This allows an interface file to
          extract files from the SWIG library and place them in the
          current directory.   This can be used to extract scripts and
          other helper code that might be associated with library files.
          For example :

                %checkout array.tcl

          Will look for a file "array.tcl" in the library and copy it
          to the current directory.    If the file already exists in the
          directory, this directive does nothing (it will not overwrite an
          existing file).  This only an experimental feature for now.

3/24/97 : SWIG will now look in the SWIG Library for a file if it can't
          find it in the current directory.  As a result, it is easy to
          make modules from SWIG library files.  For example, if you
          want to make a Python module from the SWIG timers library, just
          type this in any directory :

                swig -python timers.i

          You will get the files timers_wrap.c and timers_wrap.doc in
          the current directory that you can now compile.   The file
          remains in the SWIG library (although you can check it out
          using the -co option).  *** New Feature ***

3/24/97 : -co option added to SWIG to allow easy access to the SWIG library.
          When used, this instructs SWIG to check out a library file and
          place it in the current directory.  For example :

                unix > swig -co array.i
                array.i checked out from the SWIG library
                unix >

          Once in your directory you can customize the file to suit your
          particular purposes.  The checkout option makes it easy to
          grab library files without knowing anything about the SWIG
          installation, but it also makes it possible to start
          including scripts, C code, and other miscellaneous files
          in the library.  For example, you could put a cool script
          in the library and check it out whenever you wanted to use it.
          *** New Feature ***

3/24/97 : #pragma export directives added to Tcl output for compiling
          shared libraries on the Mac.

3/24/97 : Minor changes to wish.i and tclsh.i library files to provide
          support for the Macintosh.

3/19/97 : SWIG's policy towards NULL pointers has been relaxed.  The
          policy of requiring a special compiler directive -DALLOW_NULL
          to use NULL pointers is no longer supported.  While this may
          seem "unsafe", it turns out that you can use a "check"
          typemap to achieve some safety.   For example :

                %typemap(perl5,check) Node * {
                       if (!$target)
                            croak("NULL Pointers not allowed.");
                }

          This prevents any NULL value of a "Node *" pointer to be
          passed to a function.   (I think this is much cleaner
          than the old -DALLOW_NULL hack anyways).

3/19/97 : Fixed pointer handling errors in Perl5 module.  Modules no
          longer core dump when a Perl reference is inadvertently
          passed in as a C pointer.

3/18/97 : Added a "check" typemap.   This can be used to check the
          validity of function input values.  For example :

                %typemap(perl5,check) int posint {
                       if ($target < 0)
                           croak("Argument is not a positive integer");
                }

3/18/97 : Added an $arg variable to Tcl typemaps.   This makes it easier
          to return argument values by "reference".

3/18/97 : Fixed a code generation bug when using C++ references and
          the %addmethods directive.

3/18/97 : Fixed a few glitches in the typemap module with respect to
          chaining. For example :

                %typemap(tcl,in) int {
                       $in                // Inserts prexisting typemap
                       printf("Received a %d\n", $target);
                }

          This has been allowed for quite some time, but didn't work
          if no existing typemap was defined.  Now, it still doesn't
          work if no existing typemap is defined, but it issues a
          warning message.   There is some support using default typemaps,
          but none of the language modules take advantage of it.  This
          should be considered experimental at this time.

Version 1.1b5 Patch 1 (March 16, 1997)
======================================

3/16/97 : Fixed references bug with C++ code generation.

3/16/97 : Fixed initialization bug in the documentation system that
          was causing weird problems.

3/16/97 : Fixed fatal bug with -c option in the Python module.

3/13/97 : Fixed bug in the documentation system involving the %text directive
          and sorting. In the old system, %text entries would float to the
          top of a section because they were "nameless".   Now they are
          attached to the previous declaration and will stay in the proper
          location relative to the previous entry.

Version 1.1b5 (March 12, 1997)
==============================

3/11/97 : Fixed compilation problems introduced by Tcl/Tk 8.0a2.
          *** INCOMPATIBILITY *** SWIG no longer works with Tcl/Tk 8.0a1.

3/10/97 : Fixed bug with ignored arguments and C++ member functions in
          the Python module.

3/9/97  : Parsing bugs with nested class definitions and privately
          declared nested class definitions fixed.

3/9/97  : Fixed a few minor code generation bugs with C++ classes and
          constructors.   In some cases, the resulting wrapper code
          would not compile properly.   SWIG now attempts to use
          the default copy constructor instead.

3/8/97  : Added a -l option to SWIG that allows additional SWIG library files
          to be grabbed without having them specified in the interface file.
          This makes it easier to keep the interface file clean and move certain
          options into a Makefile.   For example :

              swig -tcl example.i              #  Build a normal Tcl extension
              swig -tcl -lwish.i example.i     #  Build it as a wish extension
                                               #  by including the 'wish.i' file.

              swig -python example.i           # Build a dynamically loaded extension
              swig -python -lembed.i example.i # Build a static extension

          These kinds of options could previously be accomplished with
          conditional compilation such as :

                   %module example
                   ...
                   #ifdef STATIC
                   %include embed.i
                   #endif

3/8/97  : Incorporated changes to Guile module to use the new gh interface
          in FSF Guile 1.0.    The older gscm interface used in Cygnus
          Guile releases is no longer supported by SWIG.

3/8/97  : Cleaned up the Tcl Netscape plugin example.   It should work with
          version 1.1 of the plugin now.

3/8/97  : Added better array support to the typemap module.  The keyword
          ANY can now be used to match any array dimension.  For example :

                    %typemap(tcl,in) double [ANY] {
                           ... get an array ...
                    }

          This will match any single-dimensional double array.   The array
          dimension is passed in the variables $dim0, $dim1, ... $dim9.  For
          example :

		    %typemap(tcl,in) double [ANY][ANY][ANY] {
			printf("Received a double[%d][%d][%d]\n",$dim0,$dim1,$dim2);
	            }

          Any typemap involving a specific array dimension will override any
          specified with the ANY tag.  Thus, a %typemap(tcl,in) double [5][4][ANY] {}
          would override a double [ANY][ANY][ANY].  However, overuse of the ANY
          tag in arrays of high-dimensions may not work as you expect due to
          the pattern matching rule used. For example, which of the following
          typemaps has precedence?

                      %typemap(in) double [ANY][5] {}     // Avoid this!
                      %typemap(in) double [5][ANY] {}

3/7/97  : Fixed a number of bugs related to multi-dimensional array handling.
          Typedefs involving multi-dimensional arrays now works correctly.
          For example :

                    typedef double MATRIX[4][4];

                    ...
                    extern double foo(MATRIX a);

          Typecasting of pointers into multi-dimensional arrays is now
          implemented properly when making C/C++ function calls.

3/6/97  : Fixed potentially dangerous bug in the Tcl Object-oriented
          interface.  Well, actually, didn't fix it but issued a
          Tcl error instead.   The bug would manifest itself as follows:

                 % set l [List]           # Create an object
                 ...
                 % set m [List -this $l]  # Make $m into an object assuming $l
                                          # contains a pointer.
                                          # Since $m == $l, $l gets destroyed
                                          # (since its the same command name)
                 % $m insert Foo
                 Segmentation fault       # Note : the list no longer exists!

          Now, an error will be generated instead of redefining the command.
          As in :

                 % set l [List]
                 ...
                 % set m [List -this $l]
                 Object name already exists!

          Use catch{} to ignore the error.

3/3/97  : Better support for enums added.   Datatypes of 'enum MyEnum'
          and typedefs such as 'typedef enum MyEnum Foo;' now work.

3/3/97  : Parser modified to ignore constructor initializers such as :

               class Foo : public Bar {
               int a,b;
               public:
                     Foo(int i) : a(0), b(i), Bar(i,0) { };
               };

3/3/97  : Modified parser to ignore C++ exception specifications such as :

               int foo(double) throw(X,Y);

3/3/97  : Added %import directive.  This works exactly like %extern
          except it tells the language module that the declarations are
          coming from a separate module.   This is usually only
          needed when working with shadow classes.

3/2/97  : Changed pointer type-checker to be significantly more
          efficient when working with derived datatypes.  This
          has been accomplished by storing type-mappings in sorted
          order, using binary search schemes, and caching recently
          used datatypes.   For SWIG generated C++ modules that
          make a large number of C function calls with derived types,
          this could result in speedups of between 100 and 50000 percent.
          However, due to the required sorting operation, module
          loading time may increased slightly when there are lots of
          datatypes.

3/2/97  : Fixed some C++ compilation problems with Python
          embed.i library files.

2/27/97 : Slight change to C++ code generation to use copy constructors
          when returning complex data type by value.

2/26/97 : Fixed bug in Python module with -c option.

2/26/97 : Slight tweak of parser to allow trailing comma in enumerations
          such as

                enum Value (ALE, STOUT, LAGER, };

2/25/97 : Fixed code generation bug in Tcl module when using the
          %name() directive on a classname.

2/25/97 : Finished code-size optimization of C++ code generation with
          inheritance of attributes.    Inherited attributes now
          only generate one set of wrapper functions that are re-used
          in any derived classes.   This could provide big code
          size improvements in some scripting language interfaces.

2/25/97 : Perl5 module modified to support both the Unix and Windows
          versions.  The windows version has been tested with the
          Activeware port of Perl 5.003 running under Windows 95.
          The C source generated by SWIG should compile without
          modification under both versions of Perl, but is now
          even more hideous than before.

2/25/97 : Modified parser to allow scope resolution operation to
          appear in expressions and default arguments as in :

                void foo(int a =  Bar::defvalue);

2/25/97 : Fixed bug when resolving symbols inside C++ classes.
          For example :

               class Foo {
               public:
                   enum Value {ALE, STOUT, LAGER};
                   ...
                   void defarg(Value v = STOUT);

              };

2/24/97 : Fixed bug with member functions returning void *.

2/23/97 : Modified Python module to be better behaved under Windows

            -  Module initialization function is now properly exported.
               It should not be neccessary to explicitly export this function
               yourself.

            -  Bizarre compilation problems when compiling the SWIG wrapper
               code as ANSI C under Visual C++ 4.x fixed.

            -  Tested with both the stock Python-1.4 distribution and Pythonwin
               running under Win95.

2/19/97 : Fixed typedef handling bug in Perl5 shadow classes.

2/19/97 : Added exception support.  To use it, do the following :

              %except(lang) {
                  ... try part of the exception ...
                  $function
                  ... catch part of exception ...
              }

          $function is a SWIG variable that will be replaced by the
          actual C/C++ function call in a wrapper function.  Thus,
          a real exception specification might look like this :

             %except(perl5) {
                  try {
                  $function
                  } catch (char *& sz) {
                    ... process an exception ...
                  } catch(...) {
                    croak("Unknown exception. Bailing out...");
                  }
             }

2/19/97 : Added support for managing generic code fragments (needed
          for exceptions).

2/19/97 : Fixed some really obscure typemap scoping bugs in the C++
          handler.

2/18/97 : Cleaned up perlmain.i file by removing some problematic,
          but seemingly unnecessary declarations.

2/18/97 : Optimized handling of member functions under inheritance.
          SWIG can now use wrapper functions generated for a
          base class instead of regenerating wrappers for
          the same functions in a derived class.    This could
          make a drastic reduction in wrapper code size for C++
          applications with deep inheritance hierarchies and
          lots of functions.

2/18/97 : Additional methods specified with %addmethods can now
          be inherited along with normal C++ member functions.

2/18/97 : Minor internal fixes to make SWIG's string handling a little
          safer.

2/16/97 : Moved some code generation of Tcl shadow classes to
          library files.

2/16/97 : Fixed documentation error of '-configure' method in
          Tcl modules.

2/16/97 : Modified Perl5 module slightly to allow typemaps
          to use Perl references.

2/12/97 : Fixed argument checking bug that was introduced by
          default arguments (function calls with too many
          arguments would still be executed).  Functions now
          must have the same number of arguments as C version
          (with possibility of default/optional arguments
          still supported).

2/12/97 : Fixed default argument bug in Perl5 module when
          generating wrapper functions involving default
          arguments of complex datatypes.

2/12/97 : Fixed typemap scoping problems.  For example :

              %typemap(tcl,in) double {
                    .. get a double ..
              }

              class Foo {
              public:
                   double bar(double);
              }

              %typemap(tcl,in) double {
                    .. new get double ..
              }

          Would apply the second typemap to all functions in Foo
          due to delayed generation of C++ wrapper code (clearly this
          is not the desired effect).   Problem has been fixed by
          assigning unique numerical identifiers to every datatype in
          an interface file and recording the "range of effect" of each
          typemap.

2/11/97 : Added support for "ignore" and "default" typemaps.  Only use
          if you absolutely know what you're doing.

2/9/97  : Added automatic creation of constructors and destructors for
          C structs and C++ classes that do not specify any sort of
          constructor or destructor.   This feature can be enabled by
          running SWIG with the '-make_default' option or by inserting
          the following pragma into an interface file :

                 %pragma make_default

          The following pragma disables automatic constructor generation

                 %pragma no_default

2/9/97  : Added -make_default option for producing default constructors
          and destructors for classes without them.

2/9/97  : Changed the syntax of the SWIG %pragma directive to
          %pragma option=value or %pragma(lang) option=value.
          This change makes the syntax a little more consistent
          between general pragmas and language-specific pragmas.
          The old syntax still works, but will probably be phased
          out (a warning message is currently printed).

2/9/97  : Improved Tcl support of global variables that are of
          structures, classes, and unions.

2/9/97  : Fixed C++ compilation problem in Python 'embed.i' library file.

2/9/97  : Fixed missing return value in perlmain.i library file.

2/9/97  : Fixed Python shadow classes to return an AttributeError when
          undefined attributes are accessed (older versions returned
          a NameError).

2/9/97  : Fixed bug when %addmethods is used after a class definition whose
          last section is protected or private.

2/8/97  : Made slight changes in include file processing to support
          the Macintosh.

2/8/97  : Extended swigmain.cxx to provide a rudimentary Macintosh interface.
          It's a really bad interface, but works until something better
          is written.

1/29/97 : Fixed type-casting bug introduced by 1.1b4 when setting/getting the
          value of global variables involving complex data types.

1/29/97 : Removed erroneous white space before an #endif in the code generated
          by the Python module (was causing errors on DEC Alpha compilers).

1/26/97 : Fixed errors when using default/optional arguments in Python shadow
	  shadow classes.

1/23/97 : Fixed bug with nested %extern declarations.

1/21/97 : Fixed problem with typedef involving const datatypes.

1/21/97 : Somewhat obscure, but serious bug with having multiple levels
          of typedefs fixed.  For example :

		typedef char *String;
                typedef String  Name;

Version 1.1 Beta4 (January 16, 1997)
====================================

Note : SWIG 1.1b3 crashed and burned shortly after take off due
to a few major run-time problems that surfaced after release.
This release should fix most, if not all, of those problems.

1/16/97 : Fixed major memory management bug on Linux

1/14/97 : Fixed bug in functions returning constant C++ references.

1/14/97 : Modified C++ module to handle datatypes better.

1/14/97 : Modified parser to allow a *single* scope resolution
          operator in datatypes.  Ie : Foo::bar.   SWIG doesn't
          yet handle nested classes, so this should be
          sufficient for now.

1/14/97 : Modified parser to allow typedef inside a C++ class.

1/14/97 : Fixed some problems related to datatypes defined inside
          a C++ class.  SWIG was not generating correct code,
          but a new scoping mechanism and method for handling
          datatypes inside a C++ class have been added.

1/14/97 : Changed enumerations to use the value name instead
          of any values that might have appeared in the interface
          file.  This makes the code a little more friendly to
          C++ compilers.

1/14/97 : Removed typedef bug that made all enumerations
          equivalent to each other in the type checker (since
          it generated alot of unnecessary code).

Version 1.1 Beta3 (January 9, 1997)
====================================

Note : A *huge* number of changes related to ongoing modifications.

1.  Support for C++ multiple inheritance added.

2.  Typemaps added.

3.  Some support for nested structure definitions added.

4.  Default argument handling added.

5.  -c option added for building bare wrapper code modules.

6.  Rewrote Pointer type-checking to support multiple inheritance
    correctly.

7.  Tcl 8.0 module added.

8.  Perl4 and Guile modules resurrected from the dead (well, they
    at least work again).

9.  New Object Oriented Tcl interface added.

10. Bug fixes to Perl5 shadow classes.

11. Cleaned up many of the internal modules of the parser.

12. Tons of examples and testing modules added.

13. Fixed bugs related to use of "const" return values.

14. Fixed bug with C++ member functions returning void *.

15. Changed SWIG configuration script.

Version 1.1 Beta2 (December 3, 1996)
====================================

1. Completely rewrote the SWIG documentation system.  The changes
   involved are too numerous to mention.  Basically, take everything
   you knew about the old system, throw them out, and read the
   file Doc/doc.ps.

2. Limited support for #if defined() added.

3. Type casts are now allowed in constant expressions.  ie

         #define  A   (int) 3

4. Added support for typedef lists.  For example :

	typedef struct {
	        double x,y,z;
        } Vector, *VectorPtr;

5. New SWIG directives (related to documentation system)

	%style
	%localstyle
	%subsection
	%subsubsection

6. Reorganized the C++ handling and made it a little easier to
   work with internally.

7.  Fixed problem with inheriting data members in Python
    shadow classes.

8.  Fixed symbol table problems with shadow classes in both
    Python and Perl.

9.  Fixed annoying segmentation fault bug in wrapper code
    generated for Perl5.

10. Fixed bug with %addmethods directive.  Now it can be placed
    anywhere in a class.

11. More test cases added to the SWIG self-test.   Documentation
    tests are now performed along with other things.

12. Reorganized the SWIG library a little bit and set it up to
    self-document itself using SWIG.

13. Lots and lots of minor bug fixes (mostly obscure, but bugs
    nonetheless).


Version 1.1 Beta1 (October 30, 1996)
====================================

1. Added new %extern directive for handling multiple files

2. Perl5 shadow classes added

3. Rewrote conditional compilation to work better

4. Added 'bool' datatype

5. %{,%} block is now optional.

6. Fixed some bugs in the Python shadow class module

7. Rewrote all of the SWIG tests to be more informative
   (and less scary).

8. Rewrote parameter list handling to be more memory
   efficient and flexible.

9. Changed parser to ignore 'static' declarations.

10. Initializers are now ignored.  For example :

	struct FooBar a = {3,4,5};

11. Somewhat better parsing of arrays (although it's
    usually just a better error message now).

12. Lot's of minor bug fixes.


Version 1.0 Final (August 31, 1996)
===================================
1. Fixed minor bug in C++ module

2. Fixed minor bug in pointer type-checker when using
   -DALLOW_NULL.

3. Fixed configure script to work with Python 1.4beta3

4. Changed configure script to allow compilation without
   yacc or bison.

Version 1.0 Final (August 28, 1996)
===================================

1.  Changed parser to support more C/C++ datatypes (well,
    more variants).   Types like "unsigned", "short int",
    "long int", etc... now work.

2.  "unions" added to parser.

3.  Use of "typedef" as in :

	typedef struct {
	     double x,y,z;
	} Vector;

    Now works correctly.   The name of the typedef is used as
    the structure name.

4.  Conditional compilation with #ifdef, #else, #endif, etc...
    added.

5.  New %disabledoc, %enabledoc directives allow documentation
    to selectively be disabled for certain parts of a wrapper
    file.

6.  New Python module supports better variable linking, constants,
    and shadow classes.

7.  Perl5 module improved with better compatibility with XS
    and xsubpp.   SWIG pointers and now created so that they
    are compatible with xsubpp pointers.

8.  Support for [incr Tcl] namespaces added to Tcl module.

9.  %pragma directive added.

10. %addmethods directive added.

11. %native directive added to allow pre-existing wrapper functions
    to be used.

12. Wrote configure script for SWIG installation.

13. Function pointers now allowed with typedef statements.

14. %typedef modified to insert a corresponding C typedef into
    the output file.

15. Fixed some problems related to C++ references.

16. New String and WrapperFunction classes add to make generating
    wrapper code easier.

17. Fixed command line option processing to eliminate core dumps
    and to allow help messages.

18. Lot's of minor bug fixes to almost all code modules


Version 1.0 Beta 3 (Patch 1) July 17, 1996
==========================================

1.0 Final is not quite ready yet, but this release fixes a
number of immediate problems :

1.  Compiler errors when using -strict 1 type checking have been fixed.

2.  Pointer type checker now recognizes pointers of the form
    _0_Type correctly.

3.  A few minor fixes were made in the Makefile

Version 1.0 Beta 3 (June 14, 1996)
===================================


There are lots of changes in this release :

1.  SWIG is now invoked using the "swig" command instead of "wrap".
    Hey, swig sounds cooler.

2.  The SWIG_LIB environment variable can be set to change the
    location where SWIG looks for library files.

3.  C++ support has been added.   You should use the -c++ option
    to enable it.

4.  The %init directive has been replaced by the %module directive.
    %module constructs a valid name for the initialization function
    for whatever target language you're using (actually this makes
    SWIG files a little cleaner).  The old %init directive still works.

5.  The syntax of the %name directive has been changed.   Use of the
    old one should generate a warning message, but may still work.

6.  To support Tcl/Tk on non-unix platforms, SWIG imports a file called
    swigtcl.cfg from the $(SWIG_LIB)/tcl directory.   I don't have access
    to an NT machine, but this file is supposedly allows SWIG to
    produce wrapper code that compiles on both UNIX and non UNIX machines.
    If this doesn't work, you'll have to edit the file swigtcl.cfg. Please
    let me know if this doesn't work so I can update the file as
    necessary.

7.  The SWIG run-time typechecker has been improved.    You can also
    now redefine how it works by supplying a file called "swigptr.cfg"
    in the same directory as your SWIG interface files.   By default,
    SWIG reads this file from $(SWIG_LIB)/config.

8.  The documentation system has been changed to support the following :

	-  Documentation order is printed in interface file order by
           default.   This can be overridden by putting an %alpha
           directive in the beginning of the interface file.

        -  You can supply additional documentation text using

           %text %{ put your text here %}

        -  A few minor bugs were fixed.

9.  A few improvements have been made to the handling of command line
    options (but it's still not finished).

10.  Lots of minor bug fixes in most of the language modules have been
     made.

11. Filenames have been changed to 8.3 for compatibility with a SWIG
    port to non-unix platforms (work in progress).

12. C++ file suffix is now .cxx (for same reason).

13. The documentation has been upgraded significantly and is now
    around 100 pages.    I added new examples and a section on
    C++.  The documentation now includes a Table of Contents.

14. The SWIG Examples directory is still woefully sparse, but is
    getting better.

Special notice about C++
------------------------
This is the first version of SWIG to support C++ parsing.  Currently
the C++ is far from complete, but seems to work for simple cases.
No work has been done to add special C++ processing to any of
the target languages.   See the user manual for details about how
C++ is handled.   If you find problems with the C++ implementation,
please let me know.  Expect major improvements in this area.

Note : I have only successfully used SWIG and C++ with Tcl and
Python.

Notice about Version 1.0Final
-----------------------------

Version 1.0B3 is the last Beta release before version 1.0 Final is
released.  I have frozen the list of features supported in version 1.0
and will only fix bugs as they show up.  Work on SWIG version 2.0 is
already in progress, but is going to result in rather significant
changes to SWIG's internal structure (hopefully for the better).  No
anticipated date for version 2.0 is set, but if you've got an idea,
let me know.

Version 1.0 Beta 2 (April 26, 1996)
===================================
This release is identical to Beta1 except a few minor bugs are
fixed and the SWIG library has been updated to work with Tcl 7.5/Tk 4.1.
A tcl7.5 examples directory is now included.

- Fixed a bug in the Makefile that didn't install the libraries
  correctly.

- SWIG Library files are now updated to work with Tcl 7.5 and Tk 4.1.

- Minor bug fixes in other modules.


Version 1.0 Beta 1  (April 10, 1996).
=====================================
This is the first "semi-official" release of SWIG.    It has a
number of substantial improvements over the Alpha release.   These
notes are in no particular order--hope I remembered everything....

1.  Tcl/Tk

SWIG is known to work with Tcl7.3, Tk3.6 and later versions.
I've also tested SWIG with expect-5.19.

Normally SWIG expects to use the header files "tcl.h" and "tk.h".
Newer versions of Tcl/Tk use version numbers.   You can specify these
in SWIG as follows :

        % wrap -htcl tcl7.4.h -htk tk4.0.h example.i

Of course, I prefer to simply set up symbolic links between "tcl.h" and
the most recent stable version on the machine.

2.  Perl4

This implementation has been based on Perl-4.035.  SWIG's interface to
Perl4 is based on the documentation provided in the "Programming Perl"
book by Larry Wall, and files located in the "usub" directory of the
Perl4 distribution.

In order to compile with Perl4, you'll need to link with the uperl.o
file found in the Perl4 source directory.  You may want to move this
file to a more convenient location.

3.  Perl5

This is a somewhat experimental implementation, but is alot less
buggy than the alpha release.     SWIG operates independently of
the XS language and xsubpp supplied with Perl5.  Currently SWIG
produces the necessary C code and .pm file needed to dynamically
load a module into Perl5.

To support Perl5's notion of modules and packages (as with xsubpp),
you can use the following command line options :

        % wrap -perl5 -module MyModule -package MyPackage example.i

Note : In order for dynamic loading to be effective, you need to be
careful about naming.    For a module named "MyModule", you'll need to
create a shared object file called "MyModule.so" using something like

        % ld -shared my_obj.o -o MyModule.so

The use of the %init directive must match the module name since Perl5
calls a function "boot_ModuleName" in order to initialize things.
See the Examples directory for some examples of how to get things
to work.

4.  Python1.3

This is the first release supporting Python.    The Python port is
experimental and may be rewritten.   Variable linkage is done through
functions which is sort of a kludge.  I also think it would be nice
to import SWIG pointers into Python as a new object (instead of strings).
Of course, this needs a little more work.

5.  Guile3

If you really want to live on the edge, pick up a copy of Guile-iii and
play around with this.      This is highly experimental---especially since
I'm not sure what the official state of Guile is these days.  This
implementation may change at any time should I suddenly figure out better
ways to do things.

6.  Extending SWIG

SWIG is written in C++ although I tend to think of the code as mostly
being ANSI C with a little inheritance thrown in.   Each target language
is implemented as a C++ class that can be plugged into the system.
If you want to add your own modifications, see Appendix C of the user
manual.   Then take a look at the "user" directory which contains some
code for building your own extenions.

7. The SWIG library

The SWIG library is still incomplete.  Some of the files mentioned in
the user manual are unavailable.    These files will be made available
when they are ready.   Subscribe to the SWIG mailing list for announcements
and updates.

8. SWIG Documentation

I have sometimes experienced problems viewing the SWIG documentation in
some postscript viewers.   However, the documentation seems to print
normally.    I'm working on making much of the documentation online,
but this takes time.

Version 0.1 Alpha (February 9, 1996)
====================================

1.  Run-time type-checking of SWIG pointers.   Pointers are now represented
    as strings with both numeric and encoded type information.    This makes
    it a little harder to shoot yourself in the foot (and it eliminates
    some segmentation faults and other oddities).

2.  Python 1.3 now supported.

3.  #define and enum can be used to install constants.

4.  Completely rewrote the %include directive and made it alot more powerful.

5.  Restructured the SWIG library to make it work better.

6.  Various bug fixes to Tcl, Perl4, Perl5, and Guile implementations.

7.  Better implementation of %typedef directive.

8.  Made some changes to SWIG's class structure to make it easier to expand.
    SWIG is now built into a library file that you can use to make your
    own extenions.

9.  Made extensive changes to the documentation.

10. Minor changes to the SWIG parser to make it use less memory.
    Also took out some extraneous rules that were undocumented and
    didn't work in the first place.

11. The SWIG library files "tclsh", "wish", "expect", etc... in the first
    release have been restructured and renamed to "tclsh.i", "wish.i",
    and so on.