//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

// <mutex>

// template <class Mutex> class unique_lock;

// unique_lock& operator=(unique_lock const&) = delete;

#include <mutex>
#include <cassert>

int main(int, char**)
{
    {
    typedef std::mutex M;
    M m0;
    M m1;
    std::unique_lock<M> lk0(m0);
    std::unique_lock<M> lk1(m1);
    lk1 = lk0;
    assert(lk1.mutex() == &m0);
    assert(lk1.owns_lock() == true);
    assert(lk0.mutex() == nullptr);
    assert(lk0.owns_lock() == false);
    }

  return 0;
}