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// UNSUPPORTED: libcpp-has-no-threads
11
12// <mutex>
13
14// template <class Mutex> class unique_lock;
15
16// unique_lock& operator=(unique_lock&& u);
17
18#include <mutex>
19#include <cassert>
20
21std::mutex m0;
22std::mutex m1;
23
24int main()
25{
26#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
27    std::unique_lock<std::mutex> lk0(m0);
28    std::unique_lock<std::mutex> lk1(m1);
29    lk1 = std::move(lk0);
30    assert(lk1.mutex() == &m0);
31    assert(lk1.owns_lock() == true);
32    assert(lk0.mutex() == nullptr);
33    assert(lk0.owns_lock() == false);
34#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
35}
36