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 // <mutex>
10 
11 // template <class Mutex> class unique_lock;
12 
13 // bool owns_lock() const;
14 
15 #include <cassert>
16 #include <mutex>
17 
18 #include "checking_mutex.h"
19 #include "test_macros.h"
20 
21 #if TEST_STD_VER >= 11
22 static_assert(noexcept(std::declval<std::unique_lock<checking_mutex>&>().owns_lock()), "");
23 #endif
24 
25 int main(int, char**) {
26   {
27     checking_mutex mux;
28     const std::unique_lock<checking_mutex> lock0; // Make sure `owns_lock()` is `const`
29     assert(!lock0.owns_lock());
30     std::unique_lock<checking_mutex> lock1(mux);
31     assert(lock1.owns_lock());
32     lock1.unlock();
33     assert(!lock1.owns_lock());
34   }
35 
36   return 0;
37 }
38