| // Copyright (C) 2019-2025 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-do compile { target c++20 } } |
| |
| #include <concepts> |
| |
| static_assert( ! std::relation<bool, void, void> ); |
| static_assert( ! std::relation<bool(), void, void> ); |
| static_assert( ! std::relation<bool(*)(), void, void> ); |
| static_assert( ! std::relation<bool(&)(int, int), void, void> ); |
| static_assert( ! std::relation<bool(), int, int> ); |
| static_assert( ! std::relation<bool() const, int, int> ); |
| |
| static_assert( std::relation<bool(*)(int, int), short, long> ); |
| static_assert( std::relation<bool(&)(const void*, const void*), char[2], int*> ); |
| |
| static_assert( ! std::relation<bool& (const long*, short), long*, char> ); |
| |
| struct A; |
| static_assert( ! std::relation<int A::*, const A&, const A&> ); |
| static_assert( ! std::relation<void (A::*)(long&), const A*, long&> ); |
| static_assert( ! std::relation<void (A::*)(long&) const, A*, long&> ); |
| static_assert( std::relation<long (A::*)(A*) const, A*, A*> ); |
| |
| struct F |
| { |
| void operator()(long, long) const; |
| bool& operator()(int, const int&) const; |
| }; |
| static_assert( ! std::relation<F, long, long> ); |
| static_assert( std::relation<F&, int, int> ); |
| static_assert( std::relation<const F&, const int, const int> ); |
| |
| // [concept.equiv] |
| static_assert( std::equivalence_relation<bool(*)(int, int), short, long> ); |
| static_assert( ! std::equivalence_relation<F, long, long> ); |
| static_assert( std::equivalence_relation<const F&, const int, const int> ); |