101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant//===----------------------------------------------------------------------===// 201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant// 301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant// The LLVM Compiler Infrastructure 401afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant// 501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant// This file is dual licensed under the MIT and the University of Illinois Open 601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant// Source Licenses. See LICENSE.TXT for details. 701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant// 801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant//===----------------------------------------------------------------------===// 901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 1001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant// <optional> 1101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 1201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant// T shall be an object type and shall satisfy the requirements of Destructible 1301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 140cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow#include <experimental/optional> 1501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 1601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#if _LIBCPP_STD_VER > 11 1701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 180cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clowusing std::experimental::optional; 190cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow 2001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantstruct X 2101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant{ 2201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantprivate: 2301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant ~X() {} 2401afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant}; 2501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 2601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#endif // _LIBCPP_STD_VER > 11 2701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 2801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantint main() 2901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant{ 3001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#if _LIBCPP_STD_VER > 11 310cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow optional<X> opt; 3201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#else 3301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#error 3401afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#endif // _LIBCPP_STD_VER > 11 3501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant} 36