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 #include "nasty_containers.hpp"
21 
22 int main()
23 {
24 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
25     {
26     typedef std::mutex M;
27 	M m0;
28 	M m1;
29     std::unique_lock<M> lk0(m0);
30     std::unique_lock<M> lk1(m1);
31     lk1 = std::move(lk0);
32     assert(lk1.mutex() == std::addressof(m0));
33     assert(lk1.owns_lock() == true);
34     assert(lk0.mutex() == nullptr);
35     assert(lk0.owns_lock() == false);
36     }
37     {
38     typedef nasty_mutex M;
39 	M m0;
40 	M m1;
41     std::unique_lock<M> lk0(m0);
42     std::unique_lock<M> lk1(m1);
43     lk1 = std::move(lk0);
44     assert(lk1.mutex() == std::addressof(m0));
45     assert(lk1.owns_lock() == true);
46     assert(lk0.mutex() == nullptr);
47     assert(lk0.owns_lock() == false);
48     }
49 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
50 }
51