134 lines
3.1 KiB
C++
134 lines
3.1 KiB
C++
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// UNSUPPORTED: no-threads
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// UNSUPPORTED: libcpp-has-no-experimental-stop_token
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// XFAIL: availability-synchronization_library-missing
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// stop_source& operator=(const stop_source& rhs) noexcept;
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#include <cassert>
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#include <concepts>
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#include <stop_token>
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#include <type_traits>
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#include "test_macros.h"
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static_assert(std::is_nothrow_copy_assignable_v<std::stop_source>);
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int main(int, char**) {
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// have two different states
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{
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std::stop_source ss1;
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std::stop_source ss2;
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assert(ss1 != ss2);
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ss2.request_stop();
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assert(!ss1.stop_requested());
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assert(ss2.stop_requested());
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std::same_as<std::stop_source&> decltype(auto) ref = ss1 = ss2;
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assert(&ref == &ss1);
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assert(ss1 == ss2);
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assert(ss1.stop_requested());
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assert(ss2.stop_requested());
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}
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// this has no state
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{
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std::stop_source ss1{std::nostopstate};
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std::stop_source ss2;
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assert(ss1 != ss2);
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ss2.request_stop();
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assert(!ss1.stop_requested());
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assert(!ss1.stop_possible());
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assert(ss2.stop_requested());
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assert(ss2.stop_possible());
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std::same_as<std::stop_source&> decltype(auto) ref = ss1 = ss2;
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assert(&ref == &ss1);
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assert(ss1 == ss2);
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assert(ss1.stop_requested());
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assert(ss1.stop_possible());
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assert(ss2.stop_requested());
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assert(ss2.stop_possible());
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}
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// other has no state
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{
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std::stop_source ss1;
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std::stop_source ss2{std::nostopstate};
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assert(ss1 != ss2);
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ss1.request_stop();
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assert(ss1.stop_requested());
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assert(ss1.stop_possible());
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assert(!ss2.stop_requested());
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assert(!ss2.stop_possible());
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std::same_as<std::stop_source&> decltype(auto) ref = ss1 = ss2;
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assert(&ref == &ss1);
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assert(ss1 == ss2);
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assert(!ss1.stop_requested());
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assert(!ss1.stop_possible());
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assert(!ss2.stop_requested());
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assert(!ss2.stop_possible());
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}
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// both no state
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{
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std::stop_source ss1{std::nostopstate};
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std::stop_source ss2{std::nostopstate};
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assert(ss1 == ss2);
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assert(!ss1.stop_requested());
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assert(!ss1.stop_possible());
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assert(!ss2.stop_requested());
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assert(!ss2.stop_possible());
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std::same_as<std::stop_source&> decltype(auto) ref = ss1 = ss2;
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assert(&ref == &ss1);
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assert(ss1 == ss2);
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assert(!ss1.stop_requested());
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assert(!ss1.stop_possible());
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assert(!ss2.stop_requested());
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assert(!ss2.stop_possible());
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}
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// self assignment
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{
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std::stop_source ss;
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auto& self = ss;
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assert(!ss.stop_requested());
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std::same_as<std::stop_source&> decltype(auto) ref = ss = self;
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assert(&ref == &ss);
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assert(!ss.stop_requested());
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ss.request_stop();
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assert(ss.stop_requested());
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}
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return 0;
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}
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