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 // UNSUPPORTED: c++98, c++03, c++11
12 
13 // <shared_mutex>
14 
15 // template <class Mutex> class shared_lock;
16 
17 // shared_lock& operator=(shared_lock&& u);
18 
19 #include <shared_mutex>
20 #include <cassert>
21 
22 std::shared_timed_mutex m0;
23 std::shared_timed_mutex m1;
24 
25 int main()
26 {
27     std::shared_lock<std::shared_timed_mutex> lk0(m0);
28     std::shared_lock<std::shared_timed_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 }
35