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// template <class U, class... Args> 1301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant// void optional<T>::emplace(initializer_list<U> il, Args&&... args); 1401afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 150cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow#include <experimental/optional> 1601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#include <type_traits> 1701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#include <cassert> 1801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#include <vector> 1901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 2001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#if _LIBCPP_STD_VER > 11 2101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 220cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clowusing std::experimental::optional; 230cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow 2401afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantclass X 2501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant{ 2601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant int i_; 2701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant int j_ = 0; 2801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantpublic: 2901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant static bool dtor_called; 3001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant constexpr X() : i_(0) {} 3101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant constexpr X(int i) : i_(i) {} 3201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant constexpr X(std::initializer_list<int> il) : i_(il.begin()[0]), j_(il.begin()[1]) {} 3301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant ~X() {dtor_called = true;} 3401afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 3501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant friend constexpr bool operator==(const X& x, const X& y) 3601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant {return x.i_ == y.i_ && x.j_ == y.j_;} 3701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant}; 3801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 3901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantbool X::dtor_called = false; 4001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 4101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantclass Y 4201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant{ 4301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant int i_; 4401afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant int j_ = 0; 4501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantpublic: 4601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant constexpr Y() : i_(0) {} 4701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant constexpr Y(int i) : i_(i) {} 4801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant constexpr Y(std::initializer_list<int> il) : i_(il.begin()[0]), j_(il.begin()[1]) {} 4901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 5001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant friend constexpr bool operator==(const Y& x, const Y& y) 5101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant {return x.i_ == y.i_ && x.j_ == y.j_;} 5201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant}; 5301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 5401afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantclass Z 5501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant{ 5601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant int i_; 5701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant int j_ = 0; 5801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantpublic: 5901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant static bool dtor_called; 6001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant constexpr Z() : i_(0) {} 6101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant constexpr Z(int i) : i_(i) {} 6201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant constexpr Z(std::initializer_list<int> il) : i_(il.begin()[0]), j_(il.begin()[1]) 6301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant {throw 6;} 6401afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant ~Z() {dtor_called = true;} 6501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 6601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant friend constexpr bool operator==(const Z& x, const Z& y) 6701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant {return x.i_ == y.i_ && x.j_ == y.j_;} 6801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant}; 6901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 7001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantbool Z::dtor_called = false; 7101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 7201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#endif // _LIBCPP_STD_VER > 11 7301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant 7401afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnantint main() 7501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant{ 7601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#if _LIBCPP_STD_VER > 11 7701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant { 7801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant X x; 7901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant { 800cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow optional<X> opt(x); 8101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant assert(X::dtor_called == false); 8201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant opt.emplace({1, 2}); 8301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant assert(X::dtor_called == true); 8401afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant assert(*opt == X({1, 2})); 8501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant } 8601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant } 8701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant { 880cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow optional<std::vector<int>> opt; 8901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant opt.emplace({1, 2, 3}, std::allocator<int>()); 9001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant assert(static_cast<bool>(opt) == true); 9101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant assert(*opt == std::vector<int>({1, 2, 3})); 9201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant } 9301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant { 940cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow optional<Y> opt; 9501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant opt.emplace({1, 2}); 9601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant assert(static_cast<bool>(opt) == true); 9701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant assert(*opt == Y({1, 2})); 9801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant } 9901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant { 10001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant Z z; 1010cdbe6048173c1f05628dbc85430acf191a3e173Marshall Clow optional<Z> opt(z); 10201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant try 10301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant { 10401afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant assert(static_cast<bool>(opt) == true); 10501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant assert(Z::dtor_called == false); 10601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant opt.emplace({1, 2}); 10701afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant } 10801afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant catch (int i) 10901afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant { 11001afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant assert(i == 6); 11101afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant assert(static_cast<bool>(opt) == false); 11201afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant assert(Z::dtor_called == true); 11301afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant } 11401afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant } 11501afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant#endif // _LIBCPP_STD_VER > 11 11601afa5c6e407e985d9643707d7b7ab1384bd9317Howard Hinnant} 117