Add support for ref-qualified functions to std::mem_fn

	PR libstdc++/57898
	* include/std/functional (_Mem_fn_traits_base): New class template.
	(_Mem_fn_traits): New class template with specializations for every
	combination of cv-qualified and ref-qualified member function.
	(_Mem_fn_base): New class template for all pointer to member function
	types and partial specialization for pointer to member object types.
	(_Mem_fn): Inherit from _Mem_fn_base.
	* testsuite/20_util/function_objects/mem_fn/refqual.cc: New.

From-SVN: r217024

libstdc++-v3/ChangeLog

+2014-11-02  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/57898
+	* include/std/functional (_Mem_fn_traits_base): New class template.
+	(_Mem_fn_traits): New class template with specializations for every
+	combination of cv-qualified and ref-qualified member function.
+	(_Mem_fn_base): New class template for all pointer to member function
+	types and partial specialization for pointer to member object types.
+	(_Mem_fn): Inherit from _Mem_fn_base.
+	* testsuite/20_util/function_objects/mem_fn/refqual.cc: New.
+
 2014-10-31  Jonathan Wakely  <jwakely@redhat.com>
 
 	* include/bits/stl_bvector.h (_Bvector_base): Use allocator_traits.

libstdc++-v3/testsuite/20_util/function_objects/mem_fn/refqual.cc

+// Copyright (C) 2014 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++11" }
+// { dg-do compile }
+
+#include <functional>
+
+struct Foo
+{
+  void r()&& { }
+  int l() const& { return 0; }
+};
+
+void test01()
+{
+  Foo f;
+  int i = std::mem_fn(&Foo::l)( f );
+  std::mem_fn(&Foo::r)( std::move(f) );
+}