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 optional(nullopt_t) noexcept; 1301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 140cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow#include <experimental/optional> 1501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#include <type_traits> 1601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#include <cassert> 1701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 1801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#if _LIBCPP_STD_VER > 11 1901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 200cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clowusing std::experimental::optional; 210cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clowusing std::experimental::nullopt_t; 220cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clowusing std::experimental::nullopt; 230cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow 2401afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnanttemplate <class Opt> 2501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantvoid 2601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnanttest_constexpr() 2701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant{ 280cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow static_assert(noexcept(Opt(nullopt)), ""); 290cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow constexpr Opt opt(nullopt); 3001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant static_assert(static_cast<bool>(opt) == false, ""); 3101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 3201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant struct test_constexpr_ctor 3301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant : public Opt 3401afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant { 3501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant constexpr test_constexpr_ctor() {} 3601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant }; 3701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant} 3801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 3901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnanttemplate <class Opt> 4001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantvoid 4101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnanttest() 4201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant{ 430cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow static_assert(noexcept(Opt(nullopt)), ""); 440cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow Opt opt(nullopt); 4501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant assert(static_cast<bool>(opt) == false); 4601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 4701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant struct test_constexpr_ctor 4801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant : public Opt 4901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant { 5001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant constexpr test_constexpr_ctor() {} 5101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant }; 5201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant} 5301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 5401afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantstruct X 5501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant{ 5601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant X(); 5701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant}; 5801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 5901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#endif // _LIBCPP_STD_VER > 11 6001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 6101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantint main() 6201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant{ 6301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#if _LIBCPP_STD_VER > 11 640cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow test_constexpr<optional<int>>(); 650cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow test_constexpr<optional<int*>>(); 660cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow test<optional<X>>(); 6701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#endif // _LIBCPP_STD_VER > 11 6801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant} 69