1*b77e50e6SHui //===----------------------------------------------------------------------===// 2*b77e50e6SHui // 3*b77e50e6SHui // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*b77e50e6SHui // See https://llvm.org/LICENSE.txt for license information. 5*b77e50e6SHui // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*b77e50e6SHui // 7*b77e50e6SHui //===----------------------------------------------------------------------===// 8*b77e50e6SHui // 9*b77e50e6SHui // UNSUPPORTED: no-threads 10*b77e50e6SHui // UNSUPPORTED: c++03, c++11, c++14, c++17 11*b77e50e6SHui // XFAIL: availability-synchronization_library-missing 12*b77e50e6SHui 13*b77e50e6SHui // [[nodiscard]] bool operator==(const stop_token& lhs, const stop_token& rhs) noexcept; 14*b77e50e6SHui // Returns: true if lhs and rhs have ownership of the same stop state or if both lhs and rhs do not have ownership of a stop state; otherwise false. 15*b77e50e6SHui 16*b77e50e6SHui // synthesized operator != also tested. 17*b77e50e6SHui 18*b77e50e6SHui #include <cassert> 19*b77e50e6SHui #include <concepts> 20*b77e50e6SHui #include <stop_token> 21*b77e50e6SHui #include <type_traits> 22*b77e50e6SHui 23*b77e50e6SHui #include "test_macros.h" 24*b77e50e6SHui 25*b77e50e6SHui // LWG 3254 is related. 26*b77e50e6SHui template <class T> 27*b77e50e6SHui concept IsNoThrowEqualityComparable = requires(const T& t1, const T& t2) { 28*b77e50e6SHui { t1 == t2 } noexcept; 29*b77e50e6SHui }; 30*b77e50e6SHui 31*b77e50e6SHui template <class T> 32*b77e50e6SHui concept IsNoThrowInequalityComparable = requires(const T& t1, const T& t2) { 33*b77e50e6SHui { t1 != t2 } noexcept; 34*b77e50e6SHui }; 35*b77e50e6SHui 36*b77e50e6SHui static_assert(IsNoThrowEqualityComparable<std::stop_token>); 37*b77e50e6SHui static_assert(IsNoThrowInequalityComparable<std::stop_token>); 38*b77e50e6SHui 39*b77e50e6SHui int main(int, char**) { 40*b77e50e6SHui // both no state 41*b77e50e6SHui { 42*b77e50e6SHui const std::stop_token st1; 43*b77e50e6SHui const std::stop_token st2; 44*b77e50e6SHui assert(st1 == st2); 45*b77e50e6SHui assert(!(st1 != st2)); 46*b77e50e6SHui } 47*b77e50e6SHui 48*b77e50e6SHui // only one has no state 49*b77e50e6SHui { 50*b77e50e6SHui std::stop_source ss; 51*b77e50e6SHui const std::stop_token st1; 52*b77e50e6SHui const auto st2 = ss.get_token(); 53*b77e50e6SHui assert(!(st1 == st2)); 54*b77e50e6SHui assert(st1 != st2); 55*b77e50e6SHui } 56*b77e50e6SHui 57*b77e50e6SHui // both has states. same source 58*b77e50e6SHui { 59*b77e50e6SHui std::stop_source ss; 60*b77e50e6SHui const auto st1 = ss.get_token(); 61*b77e50e6SHui const auto st2 = ss.get_token(); 62*b77e50e6SHui assert(st1 == st2); 63*b77e50e6SHui assert(!(st1 != st2)); 64*b77e50e6SHui } 65*b77e50e6SHui 66*b77e50e6SHui // both has states. different sources with same states 67*b77e50e6SHui { 68*b77e50e6SHui std::stop_source ss1; 69*b77e50e6SHui auto ss2 = ss1; 70*b77e50e6SHui const auto st1 = ss1.get_token(); 71*b77e50e6SHui const auto st2 = ss2.get_token(); 72*b77e50e6SHui assert(st1 == st2); 73*b77e50e6SHui assert(!(st1 != st2)); 74*b77e50e6SHui } 75*b77e50e6SHui 76*b77e50e6SHui // both has states. different sources with different states 77*b77e50e6SHui { 78*b77e50e6SHui std::stop_source ss1; 79*b77e50e6SHui std::stop_source ss2; 80*b77e50e6SHui const auto st1 = ss1.get_token(); 81*b77e50e6SHui const auto st2 = ss2.get_token(); 82*b77e50e6SHui assert(!(st1 == st2)); 83*b77e50e6SHui assert(st1 != st2); 84*b77e50e6SHui } 85*b77e50e6SHui 86*b77e50e6SHui return 0; 87*b77e50e6SHui } 88