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: no-threads
10 // UNSUPPORTED: c++03, c++11
11 
12 // <shared_mutex>
13 
14 // template <class Mutex> class shared_lock;
15 
16 // shared_lock(mutex_type& m, defer_lock_t);
17 
18 #include <shared_mutex>
19 #include <cassert>
20 #include <mutex>
21 #include "nasty_containers.h"
22 
23 #include "test_macros.h"
24 
main(int,char **)25 int main(int, char**)
26 {
27     {
28     typedef std::shared_timed_mutex M;
29     M m;
30     std::unique_lock<M> lk(m, std::defer_lock);
31     assert(lk.mutex() == std::addressof(m));
32     assert(lk.owns_lock() == false);
33     }
34     {
35     typedef nasty_mutex M;
36     M m;
37     std::unique_lock<M> lk(m, std::defer_lock);
38     assert(lk.mutex() == std::addressof(m));
39     assert(lk.owns_lock() == false);
40     }
41 
42   return 0;
43 }
44