+2013-05-21 Jonathan Wakely <jwakely.gcc@gmail.com>
+
+ PR libstdc++/57336
+ * include/std/functional (__invoke): Do not form function types with
+ abstract return type.
+ * testsuite/20_util/reference_wrapper/invoke-3.cc: New.
+
2013-05-19 Jonathan Wakely <jwakely.gcc@gmail.com>
* include/std/tuple (get): Implement N3670.
(!is_member_pointer<_Functor>::value
&& !is_function<_Functor>::value
&& !is_function<typename remove_pointer<_Functor>::type>::value),
- typename result_of<_Functor(_Args&&...)>::type
+ typename result_of<_Functor&(_Args&&...)>::type
>::type
__invoke(_Functor& __f, _Args&&... __args)
{
--- /dev/null
+// { dg-options "-std=gnu++11" }
+// { dg-do compile }
+
+// Copyright (C) 2013 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/>.
+
+// 20.8.3.4 reference_wrapper invocation [refwrap.invoke]
+#include <functional>
+
+struct ABC
+{
+ virtual bool operator()() const = 0;
+};
+
+struct Concrete : ABC
+{
+ virtual bool operator()() const { return true; }
+};
+
+Concrete c;
+ABC& abc = c;
+
+auto b = std::cref(abc)();