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 const&) = delete;
15 
16 #include <mutex>
17 #include <cassert>
18 
19 std::mutex m0;
20 std::mutex m1;
21 
main()22 int main()
23 {
24     std::unique_lock<std::mutex> lk0(m0);
25     std::unique_lock<std::mutex> lk1(m1);
26     lk1 = lk0;
27     assert(lk1.mutex() == &m0);
28     assert(lk1.owns_lock() == true);
29     assert(lk0.mutex() == nullptr);
30     assert(lk0.owns_lock() == false);
31 }
32