1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // UNSUPPORTED: libcpp-has-no-threads
10 // UNSUPPORTED: c++98, c++03, c++11
11 
12 // <shared_mutex>
13 
14 // template <class Mutex> class shared_lock;
15 
16 // shared_lock& operator=(shared_lock&& u);
17 
18 #include <shared_mutex>
19 #include <cassert>
20 #include "nasty_containers.hpp"
21 
22 
23 int main(int, char**)
24 {
25     {
26     typedef std::shared_timed_mutex M;
27     M m0;
28     M m1;
29     std::shared_lock<M> lk0(m0);
30     std::shared_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::shared_lock<M> lk0(m0);
42     std::shared_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 
50   return 0;
51 }
52