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