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 // <mutex> 11 12 // struct once_flag; 13 14 // constexpr once_flag() noexcept; 15 16 #include <mutex> 17 #include "test_macros.h" 18 19 int main() 20 { 21 { 22 std::once_flag f; 23 (void)f; 24 } 25 #if TEST_STD_VER >= 11 26 { 27 constexpr std::once_flag f; 28 (void)f; 29 } 30 #endif 31 } 32
