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99dee823 | 1 | // Copyright (C) 2020-2021 Free Software Foundation, Inc. |
e4379a93 JW |
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 run { target c++2a } } | |
20 | ||
21 | #include <atomic> | |
22 | ||
23 | #ifndef __cpp_lib_atomic_value_initialization | |
24 | # error "Feature test macro for atomic value-initialization is missing" | |
25 | #elif __cpp_lib_atomic_value_initialization < 201911L | |
26 | # error "Feature test macro for atomic value-initialization has wrong value" | |
27 | #endif | |
28 | ||
29 | #include <testsuite_hooks.h> | |
30 | ||
31 | struct A | |
32 | { | |
33 | constexpr A() : val(42) { } | |
34 | int val; | |
35 | }; | |
36 | ||
37 | constexpr std::atomic<A> a; | |
38 | ||
39 | void | |
40 | test01() | |
41 | { | |
42 | VERIFY(a.load().val == 42); | |
43 | static_assert(!std::is_nothrow_default_constructible_v<std::atomic<A>>); | |
44 | } | |
45 | ||
46 | struct B | |
47 | { | |
48 | constexpr B() noexcept : val(99) { } | |
49 | int val; | |
50 | }; | |
51 | ||
52 | constexpr std::atomic<B> b; | |
53 | ||
54 | void | |
55 | test02() | |
56 | { | |
57 | VERIFY(b.load().val == 99); | |
58 | static_assert(std::is_nothrow_default_constructible_v<std::atomic<B>>); | |
59 | } | |
60 | ||
61 | constexpr std::atomic<int*> c; | |
62 | ||
63 | void | |
64 | test03() | |
65 | { | |
66 | VERIFY(c.load() == nullptr); | |
67 | static_assert(std::is_nothrow_default_constructible_v<std::atomic<int*>>); | |
68 | } | |
69 | ||
70 | int | |
71 | main() | |
72 | { | |
73 | test01(); | |
74 | test02(); | |
75 | test03(); | |
76 | } |