| // Copyright (C) 2018-2021 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/>. |
| |
| // { dg-options "-std=gnu++2a" } |
| // { dg-do compile { target c++2a } } |
| // |
| #include <type_traits> |
| |
| using namespace std; |
| |
| template<typename T, typename = std::type_identity_t<T>> |
| struct test; // undefined |
| |
| template<typename T> |
| struct test<T, T> : std::true_type { }; |
| |
| static_assert( test<const int>{}, "type_identity_t<const int>" ); |
| static_assert( test<volatile int>{}, "type_identity_t<volatile int>" ); |
| static_assert( test<unsigned>{}, "type_identity_t<unsigned>" ); |
| static_assert( test<char>{}, "type_identity_t<char>" ); |
| static_assert( test<signed char>{}, "type_identity_t<signed char>" ); |
