| // { dg-do compile { target c++11 } } |
| |
| // Copyright (C) 2012-2021 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/>. |
| |
| #include <type_traits> |
| #include <functional> |
| |
| class S{}; // No hash specialization |
| |
| template<class T> |
| auto f(int) -> decltype(std::hash<T>(), std::true_type()); |
| |
| template<class T> |
| auto f(...) -> decltype(std::false_type()); |
| |
| static_assert(!decltype(f<S>(0))::value, ""); |
