TR1 conformance: derive from unary_function/binary_function

[SVN r34481]

include/boost/function/detail/prologue.hpp

@@ -11,6 +11,7 @@
 #define BOOST_FUNCTION_PROLOGUE_HPP
 #  include <cassert>
 #  include <algorithm>
+#  include <functional> // unary_function, binary_function
 #  include <boost/throw_exception.hpp>
 #  include <boost/config.hpp>
 #  include <boost/function/function_base.hpp>

include/boost/function/function_template.hpp

@@ -446,6 +446,17 @@ namespace boost {
     typename Allocator = BOOST_FUNCTION_DEFAULT_ALLOCATOR
   >
   class BOOST_FUNCTION_FUNCTION : public function_base
+
+#if BOOST_FUNCTION_NUM_ARGS == 1
+
+    , public std::unary_function<T0,R>
+
+#elif BOOST_FUNCTION_NUM_ARGS == 2
+
+    , public std::binary_function<T0,T1,R>
+
+#endif
+
   {
   public:
 #ifndef BOOST_NO_VOID_RETURNS