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 // [[nodiscard]] stop_token get_token() const 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 IsGetTokenNoexcept = requires(const T& t) { 24 { t.get_token() } noexcept; 25 }; 26 27 static_assert(IsGetTokenNoexcept<std::stop_source>); 28 29 int main(int, char**) { 30 // no state 31 { 32 std::stop_source ss{std::nostopstate}; 33 std::same_as<std::stop_token> decltype(auto) st = ss.get_token(); 34 assert(!st.stop_possible()); 35 assert(!st.stop_requested()); 36 } 37 38 // with state 39 { 40 std::stop_source ss; 41 std::same_as<std::stop_token> decltype(auto) st = ss.get_token(); 42 assert(st.stop_possible()); 43 assert(!st.stop_requested()); 44 45 ss.request_stop(); 46 assert(st.stop_requested()); 47 } 48 49 return 0; 50 } 51