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 22 template <class T> 23 concept IsNoThrowFreeSwappable = requires(T& t) { 24 { swap(t, t) } noexcept; 25 }; 26 27 static_assert(IsNoThrowFreeSwappable<std::stop_source>); 28 29 int 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