| // 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> |
| |
| namespace nu |
| { |
| struct S { bool swapped = false; }; |
| constexpr void swap(S&, S&) { } |
| struct T { int i; }; |
| |
| union U { char c; int i; }; |
| constexpr void swap(U&, U&) { } |
| } |
| |
| static_assert( std::swappable<nu::S> ); |
| static_assert( !std::swappable<const nu::S> ); |
| static_assert( std::swappable<nu::T> ); |
| static_assert( !std::swappable<const nu::T> ); |
| static_assert( std::swappable<nu::U> ); |
| static_assert( !std::swappable<const nu::U> ); |
