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 // XFAIL: dylib-has-no-shared_mutex
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 #include "nasty_containers.hpp"
22 
23 
24 int main(int, char**)
25 {
26     {
27     typedef std::shared_timed_mutex M;
28     M m0;
29     M m1;
30     std::shared_lock<M> lk0(m0);
31     std::shared_lock<M> lk1(m1);
32     lk1 = std::move(lk0);
33     assert(lk1.mutex() == std::addressof(m0));
34     assert(lk1.owns_lock() == true);
35     assert(lk0.mutex() == nullptr);
36     assert(lk0.owns_lock() == false);
37     }
38     {
39     typedef nasty_mutex M;
40     M m0;
41     M m1;
42     std::shared_lock<M> lk0(m0);
43     std::shared_lock<M> lk1(m1);
44     lk1 = std::move(lk0);
45     assert(lk1.mutex() == std::addressof(m0));
46     assert(lk1.owns_lock() == true);
47     assert(lk0.mutex() == nullptr);
48     assert(lk0.owns_lock() == false);
49     }
50 
51   return 0;
52 }
53