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
20int 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