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.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@199136 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 37 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/20_util/reference_wrapper/invoke-3.cc b/libstdc++-v3/testsuite/20_util/reference_wrapper/invoke-3.cc
new file mode 100644
index 00000000000..4291a672e2a
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/reference_wrapper/invoke-3.cc
@@ -0,0 +1,37 @@
+// { 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)();