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-<html>
-<head>
-<title>SWIG:Examples:java:reference</title>
-</head>
-
-<body bgcolor="#ffffff">
-
-
-<tt>SWIG/Examples/java/reference/</tt>
-<hr>
-
-<H2>C++ Reference Handling</H2>
-
-<tt>$Header$</tt><br>
-
-<p>
-This example tests SWIG's handling of C++ references.  Since C++
-references are closely related to pointers (as both refer to a
-location in memory), SWIG simply collapses all references into
-pointers when creating wrappers.
-
-<h2>Some examples</h2>
-
-References are most commonly used as function parameter.  For example,
-you might have an operator like this:
-
-<blockquote>
-<pre>
-Vector operator+(const Vector &a, const Vector &b) {
-   Vector result;
-   result.x = a.x + b.x;
-   result.y = a.y + b.y;
-   result.z = a.z + b.z;
-   return result;
-}
-</pre>
-</blockquote>
-
-or a function:
-
-<blockquote>
-<pre>
-Vector addv(const Vector &a, const Vector &b) {
-   Vector result;
-   result.x = a.x + b.x;
-   result.y = a.y + b.y;
-   result.z = a.z + b.z;
-   return result;
-}
-</pre>
-</blockquote>
-
-In these cases, SWIG transforms everything into a pointer and creates a wrapper
-that looks like this:
-
-<blockquote>
-<pre>
-Vector wrap_addv(Vector *a, Vector *b) {
-    return addv(*a,*b);
-}
-</pre>
-</blockquote>
-
-Occasionally, a reference is used as a return value of a function
-when the return result is to be used as an lvalue in an expression.
-The prototypical example is an operator like this:
-
-<blockquote>
-<pre>
-Vector &operator[](int index);
-</pre>
-</blockquote>
-
-or a method:
-
-<blockquote>
-<pre>
-Vector &get(int index);
-</pre>
-</blockquote>
-
-For functions returning references, a wrapper like this is created:
-
-<blockquote>
-<pre>
-Vector *wrap_Object_get(Object *self, int index) {
-    Vector &result = self->get(index);
-    return &result;
-}
-</pre>
-</blockquote>
-
-The following <a href="example.h">header file</a> contains some class
-definitions with some operators and use of references.
-
-<h2>SWIG Interface</h2>
-
-SWIG does NOT support overloaded operators so it can not directly build
-an interface to the classes in the above file.   However, a number of workarounds
-can be made.  For example, an overloaded operator can be stuck behind a function
-call such as the <tt>addv()</tt> function above.  Array access can be handled
-with a pair of set/get functions like this:
-
-<blockquote>
-<pre>
-class VectorArray {
-public:
- ...
-   %addmethods {
-    Vector &get(int index) {
-      return (*self)[index];
-    }
-    void set(int index, Vector &a) {
-      (*self)[index] = a;
-    }
-   }
-   ...
-}
-</pre>
-</blockquote>
-
-Click <a href="example.i">here</a> to see a SWIG interface file with these additions.
-
-<h2>Sample Java program</h2>
-
-Click <a href="main.java">here</a> to see a Java program that manipulates some C++ references.
-
-<h2>Notes:</h2>
-
-<ul>
-<li>C++ references primarily provide notational convenience for C++
-source code.  However, Java only supports the 'x.a' 
-notation so it doesn't much matter.
-
-<p>
-<li>When a program returns a reference, a pointer is returned.
-Unlike return by value, memory is not allocated to hold the
-return result.
-
-<p>
-<li>SWIG has particular trouble handling various combinations of references
-and pointers.  This is side effect of an old parsing scheme and
-type representation that will be replaced in future versions.
-
-</ul>
-
-<hr>
-</body>
-</html>