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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
+
+
+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",fragment="GC_VALUE_definition")
+{
+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
+
+}
+
+