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 // <mutex>
13 
14 // struct defer_lock_t {};
15 // struct try_to_lock_t {};
16 // struct adopt_lock_t {};
17 //
18 // constexpr defer_lock_t  defer_lock{};
19 // constexpr try_to_lock_t try_to_lock{};
20 // constexpr adopt_lock_t  adopt_lock{};
21 
22 #include <mutex>
23 #include <type_traits>
24 
main()25 int main()
26 {
27     typedef std::defer_lock_t T1;
28     typedef std::try_to_lock_t T2;
29     typedef std::adopt_lock_t T3;
30 
31     T1 t1 = std::defer_lock;
32     T2 t2 = std::try_to_lock;
33     T3 t3 = std::adopt_lock;
34 }
35