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 
21 std::mutex m0;
22 std::mutex m1;
23 
main()24 int 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