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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // UNSUPPORTED: no-threads 10 11 // <mutex> 12 13 // struct once_flag; 14 15 // constexpr once_flag() noexcept; 16 17 #include <mutex> 18 #include "test_macros.h" 19 main(int,char **)20int main(int, char**) 21 { 22 { 23 std::once_flag f; 24 (void)f; 25 } 26 #if TEST_STD_VER >= 11 27 { 28 constexpr std::once_flag f; 29 (void)f; 30 } 31 #endif 32 33 return 0; 34 } 35