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// friend void swap(stop_token& x, stop_token& y) 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_token>);
29
30int main(int, char**) {
31 {
32 std::stop_token st1;
33
34 std::stop_source source;
35 auto st2 = source.get_token();
36
37 assert(st1 != st2);
38
39 source.request_stop();
40
41 assert(!st1.stop_requested());
42 assert(st2.stop_requested());
43
44 swap(st1, st2);
45
46 assert(st1 != st2);
47 assert(st1.stop_requested());
48 assert(!st2.stop_requested());
49 }
50
51 return 0;
52}
53

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