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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: c++03, c++11, c++14, c++17
// XFAIL: availability-synchronization_library-missing
// friend void swap(jthread& x, jthread& y) noexcept;
#include <cassert>
#include <thread>
#include <type_traits>
#include "make_test_thread.h"
#include "test_macros.h"
template <class T>
concept IsFreeSwapNoexcept = requires(T& a, T& b) {
{ swap(a, b) } noexcept;
};
static_assert(IsFreeSwapNoexcept<std::jthread>);
int main(int, char**) {
// x is default constructed
{
std::jthread t1;
std::jthread t2 = support::make_test_jthread([] {});
const auto originalId2 = t2.get_id();
swap(t1, t2);
assert(t1.get_id() == originalId2);
assert(t2.get_id() == std::jthread::id());
}
// y is default constructed
{
std::jthread t1 = support::make_test_jthread([] {});
std::jthread t2{};
const auto originalId1 = t1.get_id();
swap(t1, t2);
assert(t1.get_id() == std::jthread::id());
assert(t2.get_id() == originalId1);
}
// both not default constructed
{
std::jthread t1 = support::make_test_jthread([] {});
std::jthread t2 = support::make_test_jthread([] {});
const auto originalId1 = t1.get_id();
const auto originalId2 = t2.get_id();
swap(t1, t2);
assert(t1.get_id() == originalId2);
assert(t2.get_id() == originalId1);
}
// both default constructed
{
std::jthread t1;
std::jthread t2;
swap(t1, t2);
assert(t1.get_id() == std::jthread::id());
assert(t2.get_id() == std::jthread::id());
}
return 0;
}
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