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


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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: c++03

// <mutex>

// template <class Mutex> class lock_guard;

// lock_guard(mutex_type& m, adopt_lock_t);

#include <mutex>
#include <cassert>

#include "types.h"

int main(int, char**) {
  MyMutex m;
  {
    m.lock();
    std::lock_guard<MyMutex> lg(m, std::adopt_lock);
    assert(m.locked);
  }
  assert(!m.locked);

  return 0;
}