1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// UNSUPPORTED: libcpp-has-no-threads
11
12// <shared_mutex>
13
14// template <class Mutex> class shared_lock;
15
16// explicit operator bool() const noexcept;
17
18#include <shared_mutex>
19#include <cassert>
20
21#if _LIBCPP_STD_VER > 11
22
23std::shared_timed_mutex m;
24
25#endif  // _LIBCPP_STD_VER > 11
26
27int main()
28{
29#if _LIBCPP_STD_VER > 11
30    std::shared_lock<std::shared_timed_mutex> lk0;
31    assert(static_cast<bool>(lk0) == false);
32    std::shared_lock<std::shared_timed_mutex> lk1(m);
33    assert(static_cast<bool>(lk1) == true);
34    lk1.unlock();
35    assert(static_cast<bool>(lk1) == false);
36    static_assert(noexcept(static_cast<bool>(lk0)), "explicit operator bool() must be noexcept");
37#endif  // _LIBCPP_STD_VER > 11
38}
39