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 
11 // <mutex>
12 
13 // template <class Mutex> class unique_lock;
14 
15 // unique_lock(mutex_type& m, defer_lock_t);
16 
17 #include <mutex>
18 #include <cassert>
19 #include "nasty_containers.h"
20 
21 #include "test_macros.h"
22 
main(int,char **)23 int main(int, char**)
24 {
25     {
26     typedef std::mutex M;
27     M m;
28     std::unique_lock<M> lk(m, std::defer_lock);
29     assert(lk.mutex() == std::addressof(m));
30     assert(lk.owns_lock() == false);
31     }
32     {
33     typedef nasty_mutex M;
34     M m;
35     std::unique_lock<M> lk(m, std::defer_lock);
36     assert(lk.mutex() == std::addressof(m));
37     assert(lk.owns_lock() == false);
38     }
39 
40   return 0;
41 }
42