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: libcpp-has-no-experimental-stop_token
11// UNSUPPORTED: c++03, c++11, c++14, c++17
12// XFAIL: availability-synchronization_library-missing
13
14// void swap(stop_source& rhs) noexcept;
15
16#include <cassert>
17#include <concepts>
18#include <stop_token>
19#include <type_traits>
20
21#include "test_macros.h"
22
23template <class T>
24concept IsNoThrowFreeSwappable = requires(T& t) {
25 { swap(t, t) } noexcept;
26};
27
28static_assert(IsNoThrowFreeSwappable<std::stop_source>);
29
30int main(int, char**) {
31 {
32 std::stop_source ss1;
33 std::stop_source ss2;
34
35 assert(ss1 != ss2);
36
37 ss2.request_stop();
38
39 assert(!ss1.stop_requested());
40 assert(ss2.stop_requested());
41
42 swap(ss1, ss2);
43
44 assert(ss1 != ss2);
45 assert(ss1.stop_requested());
46 assert(!ss2.stop_requested());
47 }
48
49 return 0;
50}
51

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