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/**
* @file rubystdfunctors.swg
* @date Sun May 6 00:44:33 2007
*
* @brief This file provides unary and binary functors for STL
* containers, that will invoke a Ruby proc or method to do
* their operation.
*
* You can use them in a swig file like:
*
* %include <std_set.i>
* %include <std_functors.i>
*
* %template< IntSet > std::set< int, swig::BinaryPredicate<> >;
*
*
* which will then allow calling them from Ruby either like:
*
* # order of set is defined by C++ default
* a = IntSet.new
*
* # sort order defined by Ruby proc
* b = IntSet.new( proc { |a,b| a > b } )
*
*/
%include rubyclasses.swg
%{
/* This function can be used to check whether a proc or method or similarly
callable function has been passed. Usually used in a %typecheck. */
SWIGINTERN
int SWIG_Ruby_isCallable( VALUE proc )
{
static VALUE call_id = rb_intern("call");
if ( rb_respond_to( proc, call_id ) )
return 1;
return 0;
}
/* This function can be used to check the arity (number of arguments)
a proc or method can take. Usually used in a %typecheck.
Valid arities will be that equal to minimal or those < 0
which indicate a variable number of parameters at the end.
*/
SWIGINTERN
int SWIG_Ruby_arity( VALUE proc, int minimal )
{
static VALUE arity_id = rb_intern("arity");
if ( rb_respond_to( proc, arity_id ) )
{
VALUE num = rb_funcall( proc, arity_id, 0 );
int arity = NUM2INT(num);
if ( arity < 0 && (arity+1) < -minimal ) return 1;
if ( arity == minimal ) return 1;
return 1;
}
return 0;
}
%}
namespace swig {
%apply GC_VALUE { UnaryPredicate, BinaryPredicate, UnaryFunction,
BinaryFunction };
%typecheck(SWIG_TYPECHECK_POINTER,noblock=1)
UnaryPredicate, UnaryPredicate&, UnaryFunction, UnaryFunction&
{
$1 = SWIG_Ruby_isCallable($input) && SWIG_Ruby_arity($input, 1);
}
%typecheck(SWIG_TYPECHECK_POINTER,noblock=1)
BinaryPredicate, BinaryPredicate&, BinaryFunction, BinaryFunction& {
$1 = SWIG_Ruby_isCallable($input) && SWIG_Ruby_arity($input, 2);
}
%typemap(in,noblock=1) BinaryFunction&, BinaryFunction {
$1 = new swig::BinaryFunction< >($input);
}
%typemap(in,noblock=1) UnaryFunction&, UnaryFunction {
$1 = new swig::UnaryFunction< >($input);
}
%typemap(in,noblock=1) BinaryPredicate&, BinaryPredicate {
$1 = new swig::BinaryPredicate<>($input);
}
%typemap(in,noblock=1) UnaryPredicate&, UnaryPredicate {
$1 = new swig::UnaryPredicate< >($input);
}
%ignore BinaryFunction;
template< class _T = GC_VALUE >
struct BinaryFunction {
};
%ignore UnaryFunction;
template< class _T = GC_VALUE >
struct UnaryFunction {
};
%ignore BinaryPredicate;
template< class _T = GC_VALUE >
struct BinaryPredicate {
};
%ignore UnaryPredicate;
template< class _T = GC_VALUE >
struct UnaryPredicate {
};
}
%fragment("StdFunctors","header",fragment="StdTraits")
{
namespace swig {
static ID call_id = rb_intern("call");
template <class _T = GC_VALUE, class _DefaultFunc = std::less<GC_VALUE> >
struct BinaryPredicate : GC_VALUE, std::binary_function< _T, _T, bool >
{
BinaryPredicate(VALUE obj = Qnil) : GC_VALUE(obj) { }
bool operator()(_T a, _T b) const
{
if (_obj != Qnil) {
SWIG_RUBY_THREAD_BEGIN_BLOCK;
VALUE arg1 = swig::from(a);
VALUE arg2 = swig::from(b);
VALUE res = rb_funcall( _obj, swig::call_id, 2, arg1, arg2);
SWIG_RUBY_THREAD_END_BLOCK;
return RTEST(res);
} else {
return _DefaultFunc()(a, b);
}
}
};
template <class _T = GC_VALUE, class _DefaultFunc = std::less< _T > >
struct BinaryFunction : GC_VALUE, std::binary_function< _T, _T, _T >
{
BinaryFunction(VALUE obj = Qnil) : GC_VALUE(obj) { }
_T operator()(_T a, _T b) const
{
if (_obj != Qnil) {
SWIG_RUBY_THREAD_BEGIN_BLOCK;
VALUE arg1 = swig::from(a);
VALUE arg2 = swig::from(b);
VALUE res = rb_funcall( _obj, swig::call_id, 2, arg1, arg2);
SWIG_RUBY_THREAD_END_BLOCK;
return swig::as<_T >(res);
} else {
return _DefaultFunc()(a, b);
}
}
};
template< class _T = GC_VALUE >
struct UnaryPredicate : GC_VALUE, std::unary_function< _T, bool >
{
UnaryPredicate(VALUE obj = Qnil) : GC_VALUE(obj) { }
bool operator()(_T a) const
{
SWIG_RUBY_THREAD_BEGIN_BLOCK;
VALUE arg1 = swig::from<_T >(a);
VALUE res = rb_funcall( _obj, swig::call_id, 1, arg1);
SWIG_RUBY_THREAD_END_BLOCK;
return RTEST(res);
}
};
template< class _T = GC_VALUE >
struct UnaryFunction : GC_VALUE, std::unary_function< _T, _T >
{
UnaryFunction(VALUE obj = Qnil) : GC_VALUE(obj) { }
_T operator()(_T a) const
{
SWIG_RUBY_THREAD_BEGIN_BLOCK;
VALUE arg1 = swig::from(a);
VALUE res = rb_funcall( _obj, swig::call_id, 1, VALUE(arg1));
SWIG_RUBY_THREAD_END_BLOCK;
return swig::as< _T >(res);
}
};
} // namespace swig
}
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