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