1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <mutex>
11
12// template <class Mutex> class unique_lock;
13
14// unique_lock& operator=(unique_lock&& u);
15
16#include <mutex>
17#include <cassert>
18
19std::mutex m0;
20std::mutex m1;
21
22int main()
23{
24#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
25    std::unique_lock<std::mutex> lk0(m0);
26    std::unique_lock<std::mutex> lk1(m1);
27    lk1 = std::move(lk0);
28    assert(lk1.mutex() == &m0);
29    assert(lk1.owns_lock() == true);
30    assert(lk0.mutex() == nullptr);
31    assert(lk0.owns_lock() == false);
32#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
33}
34