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 // shared_lock& operator=(shared_lock&& u);
17 
18 #include <shared_mutex>
19 #include <cassert>
20 
21 #if _LIBCPP_STD_VER > 11
22 
23 std::shared_timed_mutex m0;
24 std::shared_timed_mutex m1;
25 
26 #endif  // _LIBCPP_STD_VER > 11
27 
main()28 int main()
29 {
30 #if _LIBCPP_STD_VER > 11
31     std::shared_lock<std::shared_timed_mutex> lk0(m0);
32     std::shared_lock<std::shared_timed_mutex> lk1(m1);
33     lk1 = std::move(lk0);
34     assert(lk1.mutex() == &m0);
35     assert(lk1.owns_lock() == true);
36     assert(lk0.mutex() == nullptr);
37     assert(lk0.owns_lock() == false);
38 #endif  // _LIBCPP_STD_VER > 11
39 }
40