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 // <atomic>
11 
12 // struct atomic_flag
13 
14 // atomic_flag() = default;
15 
16 #include <atomic>
17 #include <new>
18 #include <cassert>
19 
main()20 int main()
21 {
22     std::atomic_flag f;
23 
24     {
25         typedef std::atomic_flag A;
26         _ALIGNAS_TYPE(A) char storage[sizeof(A)] = {1};
27         A& zero = *new (storage) A();
28         assert(!zero.test_and_set());
29         zero.~A();
30     }
31 }
32