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// constexpr explicit optional<T>::operator bool() const noexcept; 1301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 140cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow#include <experimental/optional> 1501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#include <type_traits> 1601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#include <cassert> 1701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 1801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantint main() 1901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant{ 2001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#if _LIBCPP_STD_VER > 11 210cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow using std::experimental::optional; 220cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow 2301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant { 240cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow constexpr optional<int> opt; 2501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant static_assert(!opt, ""); 2601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant } 2701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant { 280cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow constexpr optional<int> opt(0); 2901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant static_assert(opt, ""); 3001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant } 3101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#endif // _LIBCPP_STD_VER > 11 3201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant} 33