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// UNSUPPORTED: c++03
10
11// <mutex>
12
13// template <class Mutex> class lock_guard;
14
15// lock_guard(mutex_type& m, adopt_lock_t);
16
17#include <mutex>
18#include <cassert>
19
20#include "types.h"
21
22int main(int, char**) {
23 MyMutex m;
24 {
25 m.lock();
26 std::lock_guard<MyMutex> lg(m, std::adopt_lock);
27 assert(m.locked);
28 }
29 assert(!m.locked);
30
31 return 0;
32}
33

source code of libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/ctor.adopt_lock.pass.cpp