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// <atomic> 13 14// struct atomic_flag 15 16// atomic_flag() = default; 17 18#include <atomic> 19#include <new> 20#include <cassert> 21 22#include "test_macros.h" 23 24int main() 25{ 26 std::atomic_flag f; 27 f.clear(); 28 assert(f.test_and_set() == 0); 29 { 30 typedef std::atomic_flag A; 31 TEST_ALIGNAS_TYPE(A) char storage[sizeof(A)] = {1}; 32 A& zero = *new (storage) A(); 33 assert(!zero.test_and_set()); 34 zero.~A(); 35 } 36} 37