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