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// UNSUPPORTED: c++98, c++03, c++11
12
13// <shared_mutex>
14
15// template <class Mutex> class shared_lock;
16
17// shared_lock();
18
19#include <shared_mutex>
20#include <cassert>
21
22int main()
23{
24    std::shared_lock<std::shared_timed_mutex> ul;
25    assert(!ul.owns_lock());
26    assert(ul.mutex() == nullptr);
27}
28