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8b99f005 | 1 | // { dg-options "-std=gnu++17" } |
47df7e19 | 2 | // { dg-do compile { target c++17 } } |
8b99f005 | 3 | |
8d9254fc | 4 | // Copyright (C) 2016-2020 Free Software Foundation, Inc. |
8b99f005 JW |
5 | // |
6 | // This file is part of the GNU ISO C++ Library. This library is free | |
7 | // software; you can redistribute it and/or modify it under the | |
8 | // terms of the GNU General Public License as published by the | |
9 | // Free Software Foundation; either version 3, or (at your option) | |
10 | // any later version. | |
11 | ||
12 | // This library is distributed in the hope that it will be useful, | |
13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | // GNU General Public License for more details. | |
16 | ||
17 | // You should have received a copy of the GNU General Public License along | |
18 | // with this library; see the file COPYING3. If not see | |
19 | // <http://www.gnu.org/licenses/>. | |
20 | ||
21 | #include <optional> | |
22 | ||
23 | // Swappable. | |
24 | struct A { }; | |
25 | ||
26 | static_assert( std::is_nothrow_swappable_v<A> ); | |
27 | static_assert( std::is_nothrow_swappable_v<std::optional<A>> ); | |
28 | ||
29 | // Swappable, but might throw. | |
30 | struct B { }; | |
31 | void swap(B&, B&) noexcept(false); | |
32 | ||
33 | static_assert( std::is_swappable_v<std::optional<B>> ); | |
34 | static_assert( !std::is_nothrow_swappable_v<std::optional<B>> ); | |
35 | ||
a2863bde | 36 | // Not swappable, and optional<C> not swappable via the generic std::swap. |
8b99f005 JW |
37 | struct C { }; |
38 | void swap(C&, C&) = delete; | |
39 | ||
a2863bde | 40 | static_assert( !std::is_swappable_v<std::optional<C>> ); |
8b99f005 JW |
41 | |
42 | // Not swappable, and optional<D> not swappable via the generic std::swap. | |
43 | struct D { D(D&&) = delete; }; | |
44 | ||
45 | static_assert( !std::is_swappable_v<std::optional<D>> ); |