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// <mutex>
10
11// template <class Mutex> class unique_lock;
12
13// template <class Mutex>
14// void swap(unique_lock<Mutex>& x, unique_lock<Mutex>& y);
15
16#include <cassert>
17#include <memory>
18#include <mutex>
19
20#include "checking_mutex.h"
21#include "test_macros.h"
22
23#if TEST_STD_VER >= 11
24static_assert(noexcept(swap(std::declval<std::unique_lock<checking_mutex>&>(),
25 std::declval<std::unique_lock<checking_mutex>&>())),
26 "");
27#endif
28
29int main(int, char**) {
30 checking_mutex mux;
31 std::unique_lock<checking_mutex> lock1(mux);
32 std::unique_lock<checking_mutex> lock2;
33
34 swap(lock1, lock2);
35
36 assert(lock1.mutex() == nullptr);
37 assert(!lock1.owns_lock());
38 assert(lock2.mutex() == std::addressof(mux));
39 assert(lock2.owns_lock() == true);
40
41 return 0;
42}
43

source code of libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/nonmember_swap.pass.cpp