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1 | // Copyright (C) 2019 Free Software Foundation, Inc. |
2 | // | |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
18 | // { dg-options "-std=gnu++2a" } | |
19 | // { dg-do compile { target c++2a } } | |
20 | ||
21 | #include <concepts> | |
22 | ||
23 | namespace nu | |
24 | { | |
25 | struct S { bool swapped = false; }; | |
26 | constexpr void swap(S& l, S& r) { } | |
27 | struct T { int i; }; | |
28 | ||
29 | union U { char c; int i; }; | |
30 | constexpr void swap(U& l, U& r) { } | |
31 | } | |
32 | ||
33 | static_assert( std::swappable<nu::S> ); | |
34 | static_assert( !std::swappable<const nu::S> ); | |
35 | static_assert( std::swappable<nu::T> ); | |
36 | static_assert( !std::swappable<const nu::T> ); | |
37 | static_assert( std::swappable<nu::U> ); | |
38 | static_assert( !std::swappable<const nu::U> ); |