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 // <optional> 11 12 // T shall be an object type and shall satisfy the requirements of Destructible 13 14 #include <experimental/optional> 15 16 int main() 17 { 18 #if _LIBCPP_STD_VER > 11 19 using std::experimental::optional; 20 21 optional<void> opt; 22 #else 23 #error 24 #endif // _LIBCPP_STD_VER > 11 25 } 26
