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(shared_lock&& u);
15 
16 #include <shared_mutex>
17 #include <cassert>
18 
19 #if _LIBCPP_STD_VER > 11
20 std::shared_mutex m;
21 #endif  // _LIBCPP_STD_VER > 11
22 
23 int main()
24 {
25 #if _LIBCPP_STD_VER > 11
26     std::shared_lock<std::shared_mutex> lk0(m);
27     std::shared_lock<std::shared_mutex> lk = std::move(lk0);
28     assert(lk.mutex() == &m);
29     assert(lk.owns_lock() == true);
30     assert(lk0.mutex() == nullptr);
31     assert(lk0.owns_lock() == false);
32 #endif  // _LIBCPP_STD_VER > 11
33 }
34