1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// UNSUPPORTED: no-threads
10// UNSUPPORTED: c++03, c++11, c++14, c++17
11// XFAIL: availability-synchronization_library-missing
12
13// void swap(stop_source& rhs) noexcept;
14
15#include <cassert>
16#include <concepts>
17#include <stop_token>
18#include <type_traits>
19
20#include "test_macros.h"
21
22template <class T>
23concept IsNoThrowFreeSwappable = requires(T& t) {
24 { swap(t, t) } noexcept;
25};
26
27static_assert(IsNoThrowFreeSwappable<std::stop_source>);
28
29int main(int, char**) {
30 {
31 std::stop_source ss1;
32 std::stop_source ss2;
33
34 assert(ss1 != ss2);
35
36 ss2.request_stop();
37
38 assert(!ss1.stop_requested());
39 assert(ss2.stop_requested());
40
41 swap(ss1, ss2);
42
43 assert(ss1 != ss2);
44 assert(ss1.stop_requested());
45 assert(!ss2.stop_requested());
46 }
47
48 return 0;
49}
50

source code of libcxx/test/std/thread/thread.stoptoken/stopsource/swap.free.pass.cpp