1// { dg-options "-std=gnu++11" }
2// { dg-do compile }
3
4// Copyright (C) 2012-2015 Free Software Foundation, Inc.
5//
6// This file is part of the GNU ISO C++ Library.  This library is free
7// software; you can redistribute it and/or modify it under the
8// terms of the GNU General Public License as published by the
9// Free Software Foundation; either version 3, or (at your option)
10// any later version.
11//
12// This library is distributed in the hope that it will be useful,
13// but WITHOUT ANY WARRANTY; without even the implied warranty of
14// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15// GNU General Public License for more details.
16//
17// You should have received a copy of the GNU General Public License
18// along with this library; see the file COPYING3.  If not see
19// <http://www.gnu.org/licenses/>.
20
21#include <type_traits>
22#include <functional>
23
24class S{}; // No hash specialization
25
26template<class T>
27auto f(int) -> decltype(std::hash<T>(), std::true_type());
28
29template<class T>
30auto f(...) -> decltype(std::false_type());
31
32static_assert(!decltype(f<S>(0))::value, "");
33