36 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// <atomic>10 11// struct atomic_flag12 13// atomic_flag() = default;14 15#include <atomic>16#include <new>17#include <cassert>18 19#include "test_macros.h"20 21int main(int, char**)22{23 std::atomic_flag f;24 f.clear();25 assert(f.test_and_set() == 0);26 {27 typedef std::atomic_flag A;28 TEST_ALIGNAS_TYPE(A) char storage[sizeof(A)] = {1};29 A& zero = *new (storage) A();30 assert(!zero.test_and_set());31 zero.~A();32 }33 34 return 0;35}36