10b57cec5SDimitry Andric// -*- C++ -*- 2349cc55cSDimitry Andric//===----------------------------------------------------------------------===// 30b57cec5SDimitry Andric// 40b57cec5SDimitry Andric// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 50b57cec5SDimitry Andric// See https://llvm.org/LICENSE.txt for license information. 60b57cec5SDimitry Andric// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 70b57cec5SDimitry Andric// 80b57cec5SDimitry Andric//===----------------------------------------------------------------------===// 90b57cec5SDimitry Andric 100b57cec5SDimitry Andric#ifndef _LIBCPP_VARIANT 110b57cec5SDimitry Andric#define _LIBCPP_VARIANT 120b57cec5SDimitry Andric 130b57cec5SDimitry Andric/* 140b57cec5SDimitry Andric variant synopsis 150b57cec5SDimitry Andric 160b57cec5SDimitry Andricnamespace std { 170b57cec5SDimitry Andric 180b57cec5SDimitry Andric // 20.7.2, class template variant 190b57cec5SDimitry Andric template <class... Types> 200b57cec5SDimitry Andric class variant { 210b57cec5SDimitry Andric public: 220b57cec5SDimitry Andric 230b57cec5SDimitry Andric // 20.7.2.1, constructors 240b57cec5SDimitry Andric constexpr variant() noexcept(see below); 25*bdd1243dSDimitry Andric constexpr variant(const variant&); 26*bdd1243dSDimitry Andric constexpr variant(variant&&) noexcept(see below); 270b57cec5SDimitry Andric 280b57cec5SDimitry Andric template <class T> constexpr variant(T&&) noexcept(see below); 290b57cec5SDimitry Andric 300b57cec5SDimitry Andric template <class T, class... Args> 310b57cec5SDimitry Andric constexpr explicit variant(in_place_type_t<T>, Args&&...); 320b57cec5SDimitry Andric 330b57cec5SDimitry Andric template <class T, class U, class... Args> 340b57cec5SDimitry Andric constexpr explicit variant( 350b57cec5SDimitry Andric in_place_type_t<T>, initializer_list<U>, Args&&...); 360b57cec5SDimitry Andric 370b57cec5SDimitry Andric template <size_t I, class... Args> 380b57cec5SDimitry Andric constexpr explicit variant(in_place_index_t<I>, Args&&...); 390b57cec5SDimitry Andric 400b57cec5SDimitry Andric template <size_t I, class U, class... Args> 410b57cec5SDimitry Andric constexpr explicit variant( 420b57cec5SDimitry Andric in_place_index_t<I>, initializer_list<U>, Args&&...); 430b57cec5SDimitry Andric 440b57cec5SDimitry Andric // 20.7.2.2, destructor 450b57cec5SDimitry Andric ~variant(); 460b57cec5SDimitry Andric 470b57cec5SDimitry Andric // 20.7.2.3, assignment 48*bdd1243dSDimitry Andric constexpr variant& operator=(const variant&); 49*bdd1243dSDimitry Andric constexpr variant& operator=(variant&&) noexcept(see below); 500b57cec5SDimitry Andric 510b57cec5SDimitry Andric template <class T> variant& operator=(T&&) noexcept(see below); 520b57cec5SDimitry Andric 530b57cec5SDimitry Andric // 20.7.2.4, modifiers 540b57cec5SDimitry Andric template <class T, class... Args> 550b57cec5SDimitry Andric T& emplace(Args&&...); 560b57cec5SDimitry Andric 570b57cec5SDimitry Andric template <class T, class U, class... Args> 580b57cec5SDimitry Andric T& emplace(initializer_list<U>, Args&&...); 590b57cec5SDimitry Andric 600b57cec5SDimitry Andric template <size_t I, class... Args> 610b57cec5SDimitry Andric variant_alternative_t<I, variant>& emplace(Args&&...); 620b57cec5SDimitry Andric 630b57cec5SDimitry Andric template <size_t I, class U, class... Args> 640b57cec5SDimitry Andric variant_alternative_t<I, variant>& emplace(initializer_list<U>, Args&&...); 650b57cec5SDimitry Andric 660b57cec5SDimitry Andric // 20.7.2.5, value status 670b57cec5SDimitry Andric constexpr bool valueless_by_exception() const noexcept; 680b57cec5SDimitry Andric constexpr size_t index() const noexcept; 690b57cec5SDimitry Andric 700b57cec5SDimitry Andric // 20.7.2.6, swap 710b57cec5SDimitry Andric void swap(variant&) noexcept(see below); 720b57cec5SDimitry Andric }; 730b57cec5SDimitry Andric 740b57cec5SDimitry Andric // 20.7.3, variant helper classes 750b57cec5SDimitry Andric template <class T> struct variant_size; // undefined 760b57cec5SDimitry Andric 770b57cec5SDimitry Andric template <class T> 780b57cec5SDimitry Andric inline constexpr size_t variant_size_v = variant_size<T>::value; 790b57cec5SDimitry Andric 800b57cec5SDimitry Andric template <class T> struct variant_size<const T>; 810b57cec5SDimitry Andric template <class T> struct variant_size<volatile T>; 820b57cec5SDimitry Andric template <class T> struct variant_size<const volatile T>; 830b57cec5SDimitry Andric 840b57cec5SDimitry Andric template <class... Types> 850b57cec5SDimitry Andric struct variant_size<variant<Types...>>; 860b57cec5SDimitry Andric 870b57cec5SDimitry Andric template <size_t I, class T> struct variant_alternative; // undefined 880b57cec5SDimitry Andric 890b57cec5SDimitry Andric template <size_t I, class T> 900b57cec5SDimitry Andric using variant_alternative_t = typename variant_alternative<I, T>::type; 910b57cec5SDimitry Andric 920b57cec5SDimitry Andric template <size_t I, class T> struct variant_alternative<I, const T>; 930b57cec5SDimitry Andric template <size_t I, class T> struct variant_alternative<I, volatile T>; 940b57cec5SDimitry Andric template <size_t I, class T> struct variant_alternative<I, const volatile T>; 950b57cec5SDimitry Andric 960b57cec5SDimitry Andric template <size_t I, class... Types> 970b57cec5SDimitry Andric struct variant_alternative<I, variant<Types...>>; 980b57cec5SDimitry Andric 990b57cec5SDimitry Andric inline constexpr size_t variant_npos = -1; 1000b57cec5SDimitry Andric 1010b57cec5SDimitry Andric // 20.7.4, value access 1020b57cec5SDimitry Andric template <class T, class... Types> 1030b57cec5SDimitry Andric constexpr bool holds_alternative(const variant<Types...>&) noexcept; 1040b57cec5SDimitry Andric 1050b57cec5SDimitry Andric template <size_t I, class... Types> 1060b57cec5SDimitry Andric constexpr variant_alternative_t<I, variant<Types...>>& 1070b57cec5SDimitry Andric get(variant<Types...>&); 1080b57cec5SDimitry Andric 1090b57cec5SDimitry Andric template <size_t I, class... Types> 1100b57cec5SDimitry Andric constexpr variant_alternative_t<I, variant<Types...>>&& 1110b57cec5SDimitry Andric get(variant<Types...>&&); 1120b57cec5SDimitry Andric 1130b57cec5SDimitry Andric template <size_t I, class... Types> 1140b57cec5SDimitry Andric constexpr variant_alternative_t<I, variant<Types...>> const& 1150b57cec5SDimitry Andric get(const variant<Types...>&); 1160b57cec5SDimitry Andric 1170b57cec5SDimitry Andric template <size_t I, class... Types> 1180b57cec5SDimitry Andric constexpr variant_alternative_t<I, variant<Types...>> const&& 1190b57cec5SDimitry Andric get(const variant<Types...>&&); 1200b57cec5SDimitry Andric 1210b57cec5SDimitry Andric template <class T, class... Types> 1220b57cec5SDimitry Andric constexpr T& get(variant<Types...>&); 1230b57cec5SDimitry Andric 1240b57cec5SDimitry Andric template <class T, class... Types> 1250b57cec5SDimitry Andric constexpr T&& get(variant<Types...>&&); 1260b57cec5SDimitry Andric 1270b57cec5SDimitry Andric template <class T, class... Types> 1280b57cec5SDimitry Andric constexpr const T& get(const variant<Types...>&); 1290b57cec5SDimitry Andric 1300b57cec5SDimitry Andric template <class T, class... Types> 1310b57cec5SDimitry Andric constexpr const T&& get(const variant<Types...>&&); 1320b57cec5SDimitry Andric 1330b57cec5SDimitry Andric template <size_t I, class... Types> 1340b57cec5SDimitry Andric constexpr add_pointer_t<variant_alternative_t<I, variant<Types...>>> 1350b57cec5SDimitry Andric get_if(variant<Types...>*) noexcept; 1360b57cec5SDimitry Andric 1370b57cec5SDimitry Andric template <size_t I, class... Types> 1380b57cec5SDimitry Andric constexpr add_pointer_t<const variant_alternative_t<I, variant<Types...>>> 1390b57cec5SDimitry Andric get_if(const variant<Types...>*) noexcept; 1400b57cec5SDimitry Andric 1410b57cec5SDimitry Andric template <class T, class... Types> 1420b57cec5SDimitry Andric constexpr add_pointer_t<T> 1430b57cec5SDimitry Andric get_if(variant<Types...>*) noexcept; 1440b57cec5SDimitry Andric 1450b57cec5SDimitry Andric template <class T, class... Types> 1460b57cec5SDimitry Andric constexpr add_pointer_t<const T> 1470b57cec5SDimitry Andric get_if(const variant<Types...>*) noexcept; 1480b57cec5SDimitry Andric 1490b57cec5SDimitry Andric // 20.7.5, relational operators 1500b57cec5SDimitry Andric template <class... Types> 1510b57cec5SDimitry Andric constexpr bool operator==(const variant<Types...>&, const variant<Types...>&); 1520b57cec5SDimitry Andric 1530b57cec5SDimitry Andric template <class... Types> 1540b57cec5SDimitry Andric constexpr bool operator!=(const variant<Types...>&, const variant<Types...>&); 1550b57cec5SDimitry Andric 1560b57cec5SDimitry Andric template <class... Types> 1570b57cec5SDimitry Andric constexpr bool operator<(const variant<Types...>&, const variant<Types...>&); 1580b57cec5SDimitry Andric 1590b57cec5SDimitry Andric template <class... Types> 1600b57cec5SDimitry Andric constexpr bool operator>(const variant<Types...>&, const variant<Types...>&); 1610b57cec5SDimitry Andric 1620b57cec5SDimitry Andric template <class... Types> 1630b57cec5SDimitry Andric constexpr bool operator<=(const variant<Types...>&, const variant<Types...>&); 1640b57cec5SDimitry Andric 1650b57cec5SDimitry Andric template <class... Types> 1660b57cec5SDimitry Andric constexpr bool operator>=(const variant<Types...>&, const variant<Types...>&); 1670b57cec5SDimitry Andric 168*bdd1243dSDimitry Andric template <class... Types> requires (three_way_comparable<Types> && ...) 169*bdd1243dSDimitry Andric constexpr common_comparison_category_t<compare_three_way_result_t<Types>...> 170*bdd1243dSDimitry Andric operator<=>(const variant<Types...>&, const variant<Types...>&); // since C++20 171*bdd1243dSDimitry Andric 1720b57cec5SDimitry Andric // 20.7.6, visitation 1730b57cec5SDimitry Andric template <class Visitor, class... Variants> 1740b57cec5SDimitry Andric constexpr see below visit(Visitor&&, Variants&&...); 1750b57cec5SDimitry Andric 176e8d8bef9SDimitry Andric template <class R, class Visitor, class... Variants> 177e8d8bef9SDimitry Andric constexpr R visit(Visitor&&, Variants&&...); // since C++20 178e8d8bef9SDimitry Andric 1790b57cec5SDimitry Andric // 20.7.7, class monostate 1800b57cec5SDimitry Andric struct monostate; 1810b57cec5SDimitry Andric 1820b57cec5SDimitry Andric // 20.7.8, monostate relational operators 1830b57cec5SDimitry Andric constexpr bool operator==(monostate, monostate) noexcept; 184*bdd1243dSDimitry Andric constexpr bool operator!=(monostate, monostate) noexcept; // until C++20 185*bdd1243dSDimitry Andric constexpr bool operator<(monostate, monostate) noexcept; // until C++20 186*bdd1243dSDimitry Andric constexpr bool operator>(monostate, monostate) noexcept; // until C++20 187*bdd1243dSDimitry Andric constexpr bool operator<=(monostate, monostate) noexcept; // until C++20 188*bdd1243dSDimitry Andric constexpr bool operator>=(monostate, monostate) noexcept; // until C++20 189*bdd1243dSDimitry Andric constexpr strong_ordering operator<=>(monostate, monostate) noexcept; // since C++20 1900b57cec5SDimitry Andric 1910b57cec5SDimitry Andric // 20.7.9, specialized algorithms 1920b57cec5SDimitry Andric template <class... Types> 1930b57cec5SDimitry Andric void swap(variant<Types...>&, variant<Types...>&) noexcept(see below); 1940b57cec5SDimitry Andric 1950b57cec5SDimitry Andric // 20.7.10, class bad_variant_access 1960b57cec5SDimitry Andric class bad_variant_access; 1970b57cec5SDimitry Andric 1980b57cec5SDimitry Andric // 20.7.11, hash support 1990b57cec5SDimitry Andric template <class T> struct hash; 2000b57cec5SDimitry Andric template <class... Types> struct hash<variant<Types...>>; 2010b57cec5SDimitry Andric template <> struct hash<monostate>; 2020b57cec5SDimitry Andric 2030b57cec5SDimitry Andric} // namespace std 2040b57cec5SDimitry Andric 2050b57cec5SDimitry Andric*/ 2060b57cec5SDimitry Andric 20781ad6265SDimitry Andric#include <__assert> // all public C++ headers provide the assertion handler 208e8d8bef9SDimitry Andric#include <__availability> 209*bdd1243dSDimitry Andric#include <__compare/common_comparison_category.h> 210*bdd1243dSDimitry Andric#include <__compare/compare_three_way_result.h> 211*bdd1243dSDimitry Andric#include <__compare/three_way_comparable.h> 212fe6060f1SDimitry Andric#include <__config> 213fe6060f1SDimitry Andric#include <__functional/hash.h> 214*bdd1243dSDimitry Andric#include <__functional/invoke.h> 21581ad6265SDimitry Andric#include <__functional/operations.h> 21681ad6265SDimitry Andric#include <__functional/unary_function.h> 217*bdd1243dSDimitry Andric#include <__type_traits/add_const.h> 218*bdd1243dSDimitry Andric#include <__type_traits/add_cv.h> 219*bdd1243dSDimitry Andric#include <__type_traits/add_pointer.h> 220*bdd1243dSDimitry Andric#include <__type_traits/add_volatile.h> 221*bdd1243dSDimitry Andric#include <__type_traits/dependent_type.h> 222*bdd1243dSDimitry Andric#include <__type_traits/is_array.h> 223*bdd1243dSDimitry Andric#include <__type_traits/is_destructible.h> 224*bdd1243dSDimitry Andric#include <__type_traits/is_nothrow_move_constructible.h> 225*bdd1243dSDimitry Andric#include <__type_traits/is_trivially_copy_assignable.h> 226*bdd1243dSDimitry Andric#include <__type_traits/is_trivially_copy_constructible.h> 227*bdd1243dSDimitry Andric#include <__type_traits/is_trivially_destructible.h> 228*bdd1243dSDimitry Andric#include <__type_traits/is_trivially_move_assignable.h> 229*bdd1243dSDimitry Andric#include <__type_traits/is_trivially_move_constructible.h> 230*bdd1243dSDimitry Andric#include <__type_traits/is_void.h> 231*bdd1243dSDimitry Andric#include <__type_traits/remove_const.h> 232*bdd1243dSDimitry Andric#include <__type_traits/type_identity.h> 233*bdd1243dSDimitry Andric#include <__type_traits/void_t.h> 234fe6060f1SDimitry Andric#include <__utility/forward.h> 23581ad6265SDimitry Andric#include <__utility/in_place.h> 23681ad6265SDimitry Andric#include <__utility/move.h> 23781ad6265SDimitry Andric#include <__utility/swap.h> 238fe6060f1SDimitry Andric#include <__variant/monostate.h> 2390b57cec5SDimitry Andric#include <exception> 2400b57cec5SDimitry Andric#include <initializer_list> 241fe6060f1SDimitry Andric#include <limits> 2420b57cec5SDimitry Andric#include <new> 2430b57cec5SDimitry Andric#include <tuple> 2440b57cec5SDimitry Andric#include <version> 2450b57cec5SDimitry Andric 24681ad6265SDimitry Andric// standard-mandated includes 247*bdd1243dSDimitry Andric 248*bdd1243dSDimitry Andric// [variant.syn] 24981ad6265SDimitry Andric#include <compare> 25081ad6265SDimitry Andric 2510b57cec5SDimitry Andric#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 2520b57cec5SDimitry Andric# pragma GCC system_header 2530b57cec5SDimitry Andric#endif 2540b57cec5SDimitry Andric 2550b57cec5SDimitry Andric_LIBCPP_PUSH_MACROS 2560b57cec5SDimitry Andric#include <__undef_macros> 2570b57cec5SDimitry Andric 2580b57cec5SDimitry Andricnamespace std { // explicitly not using versioning namespace 2590b57cec5SDimitry Andric 2600b57cec5SDimitry Andricclass _LIBCPP_EXCEPTION_ABI _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS bad_variant_access : public exception { 2610b57cec5SDimitry Andricpublic: 262*bdd1243dSDimitry Andric const char* what() const _NOEXCEPT override; 2630b57cec5SDimitry Andric}; 2640b57cec5SDimitry Andric 2650b57cec5SDimitry Andric} // namespace std 2660b57cec5SDimitry Andric 2670b57cec5SDimitry Andric_LIBCPP_BEGIN_NAMESPACE_STD 2680b57cec5SDimitry Andric 269349cc55cSDimitry Andric#if _LIBCPP_STD_VER > 14 2700b57cec5SDimitry Andric 271fe6060f1SDimitry Andric// Light N-dimensional array of function pointers. Used in place of std::array to avoid 272fe6060f1SDimitry Andric// adding a dependency. 273fe6060f1SDimitry Andrictemplate<class _Tp, size_t _Size> 274fe6060f1SDimitry Andricstruct __farray { 275fe6060f1SDimitry Andric static_assert(_Size > 0, "N-dimensional array should never be empty in std::visit"); 276fe6060f1SDimitry Andric _Tp __buf_[_Size] = {}; 277fe6060f1SDimitry Andric 278fe6060f1SDimitry Andric _LIBCPP_INLINE_VISIBILITY constexpr 279fe6060f1SDimitry Andric const _Tp &operator[](size_t __n) const noexcept { 280fe6060f1SDimitry Andric return __buf_[__n]; 281fe6060f1SDimitry Andric } 282fe6060f1SDimitry Andric}; 283fe6060f1SDimitry Andric 2840b57cec5SDimitry Andric_LIBCPP_NORETURN 285*bdd1243dSDimitry Andricinline _LIBCPP_HIDE_FROM_ABI 2860b57cec5SDimitry Andric_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS 2870b57cec5SDimitry Andricvoid __throw_bad_variant_access() { 2880b57cec5SDimitry Andric#ifndef _LIBCPP_NO_EXCEPTIONS 2890b57cec5SDimitry Andric throw bad_variant_access(); 2900b57cec5SDimitry Andric#else 2910b57cec5SDimitry Andric _VSTD::abort(); 2920b57cec5SDimitry Andric#endif 2930b57cec5SDimitry Andric} 2940b57cec5SDimitry Andric 2950b57cec5SDimitry Andrictemplate <class... _Types> 2960b57cec5SDimitry Andricclass _LIBCPP_TEMPLATE_VIS variant; 2970b57cec5SDimitry Andric 2980b57cec5SDimitry Andrictemplate <class _Tp> 2990b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_size; 3000b57cec5SDimitry Andric 3010b57cec5SDimitry Andrictemplate <class _Tp> 302349cc55cSDimitry Andricinline constexpr size_t variant_size_v = variant_size<_Tp>::value; 3030b57cec5SDimitry Andric 3040b57cec5SDimitry Andrictemplate <class _Tp> 3050b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_size<const _Tp> : variant_size<_Tp> {}; 3060b57cec5SDimitry Andric 3070b57cec5SDimitry Andrictemplate <class _Tp> 3080b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_size<volatile _Tp> : variant_size<_Tp> {}; 3090b57cec5SDimitry Andric 3100b57cec5SDimitry Andrictemplate <class _Tp> 3110b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_size<const volatile _Tp> 3120b57cec5SDimitry Andric : variant_size<_Tp> {}; 3130b57cec5SDimitry Andric 3140b57cec5SDimitry Andrictemplate <class... _Types> 3150b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_size<variant<_Types...>> 3160b57cec5SDimitry Andric : integral_constant<size_t, sizeof...(_Types)> {}; 3170b57cec5SDimitry Andric 3180b57cec5SDimitry Andrictemplate <size_t _Ip, class _Tp> 3190b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_alternative; 3200b57cec5SDimitry Andric 3210b57cec5SDimitry Andrictemplate <size_t _Ip, class _Tp> 3220b57cec5SDimitry Andricusing variant_alternative_t = typename variant_alternative<_Ip, _Tp>::type; 3230b57cec5SDimitry Andric 3240b57cec5SDimitry Andrictemplate <size_t _Ip, class _Tp> 3250b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_alternative<_Ip, const _Tp> 3260b57cec5SDimitry Andric : add_const<variant_alternative_t<_Ip, _Tp>> {}; 3270b57cec5SDimitry Andric 3280b57cec5SDimitry Andrictemplate <size_t _Ip, class _Tp> 3290b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_alternative<_Ip, volatile _Tp> 3300b57cec5SDimitry Andric : add_volatile<variant_alternative_t<_Ip, _Tp>> {}; 3310b57cec5SDimitry Andric 3320b57cec5SDimitry Andrictemplate <size_t _Ip, class _Tp> 3330b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_alternative<_Ip, const volatile _Tp> 3340b57cec5SDimitry Andric : add_cv<variant_alternative_t<_Ip, _Tp>> {}; 3350b57cec5SDimitry Andric 3360b57cec5SDimitry Andrictemplate <size_t _Ip, class... _Types> 3370b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_alternative<_Ip, variant<_Types...>> { 3380b57cec5SDimitry Andric static_assert(_Ip < sizeof...(_Types), "Index out of bounds in std::variant_alternative<>"); 3390b57cec5SDimitry Andric using type = __type_pack_element<_Ip, _Types...>; 3400b57cec5SDimitry Andric}; 3410b57cec5SDimitry Andric 342349cc55cSDimitry Andricinline constexpr size_t variant_npos = static_cast<size_t>(-1); 3430b57cec5SDimitry Andric 344*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr int __choose_index_type(unsigned int __num_elem) { 345e8d8bef9SDimitry Andric if (__num_elem < numeric_limits<unsigned char>::max()) 3460b57cec5SDimitry Andric return 0; 347e8d8bef9SDimitry Andric if (__num_elem < numeric_limits<unsigned short>::max()) 3480b57cec5SDimitry Andric return 1; 3490b57cec5SDimitry Andric return 2; 3500b57cec5SDimitry Andric} 3510b57cec5SDimitry Andric 3520b57cec5SDimitry Andrictemplate <size_t _NumAlts> 3530b57cec5SDimitry Andricusing __variant_index_t = 3540b57cec5SDimitry Andric#ifndef _LIBCPP_ABI_VARIANT_INDEX_TYPE_OPTIMIZATION 3550b57cec5SDimitry Andric unsigned int; 3560b57cec5SDimitry Andric#else 3570b57cec5SDimitry Andric std::tuple_element_t< 3580b57cec5SDimitry Andric __choose_index_type(_NumAlts), 3590b57cec5SDimitry Andric std::tuple<unsigned char, unsigned short, unsigned int> 3600b57cec5SDimitry Andric >; 3610b57cec5SDimitry Andric#endif 3620b57cec5SDimitry Andric 3630b57cec5SDimitry Andrictemplate <class _IndexType> 3640b57cec5SDimitry Andricconstexpr _IndexType __variant_npos = static_cast<_IndexType>(-1); 3650b57cec5SDimitry Andric 366fe6060f1SDimitry Andrictemplate <class... _Types> 367fe6060f1SDimitry Andricclass _LIBCPP_TEMPLATE_VIS variant; 368fe6060f1SDimitry Andric 369fe6060f1SDimitry Andrictemplate <class... _Types> 370fe6060f1SDimitry Andric_LIBCPP_INLINE_VISIBILITY constexpr variant<_Types...>& 371fe6060f1SDimitry Andric__as_variant(variant<_Types...>& __vs) noexcept { 372fe6060f1SDimitry Andric return __vs; 373fe6060f1SDimitry Andric} 374fe6060f1SDimitry Andric 375fe6060f1SDimitry Andrictemplate <class... _Types> 376fe6060f1SDimitry Andric_LIBCPP_INLINE_VISIBILITY constexpr const variant<_Types...>& 377fe6060f1SDimitry Andric__as_variant(const variant<_Types...>& __vs) noexcept { 378fe6060f1SDimitry Andric return __vs; 379fe6060f1SDimitry Andric} 380fe6060f1SDimitry Andric 381fe6060f1SDimitry Andrictemplate <class... _Types> 382fe6060f1SDimitry Andric_LIBCPP_INLINE_VISIBILITY constexpr variant<_Types...>&& 383fe6060f1SDimitry Andric__as_variant(variant<_Types...>&& __vs) noexcept { 384fe6060f1SDimitry Andric return _VSTD::move(__vs); 385fe6060f1SDimitry Andric} 386fe6060f1SDimitry Andric 387fe6060f1SDimitry Andrictemplate <class... _Types> 388fe6060f1SDimitry Andric_LIBCPP_INLINE_VISIBILITY constexpr const variant<_Types...>&& 389fe6060f1SDimitry Andric__as_variant(const variant<_Types...>&& __vs) noexcept { 390fe6060f1SDimitry Andric return _VSTD::move(__vs); 391fe6060f1SDimitry Andric} 392fe6060f1SDimitry Andric 3930b57cec5SDimitry Andricnamespace __find_detail { 3940b57cec5SDimitry Andric 3950b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 396*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 3970b57cec5SDimitry Andricconstexpr size_t __find_index() { 3980b57cec5SDimitry Andric constexpr bool __matches[] = {is_same_v<_Tp, _Types>...}; 3990b57cec5SDimitry Andric size_t __result = __not_found; 4000b57cec5SDimitry Andric for (size_t __i = 0; __i < sizeof...(_Types); ++__i) { 4010b57cec5SDimitry Andric if (__matches[__i]) { 4020b57cec5SDimitry Andric if (__result != __not_found) { 4030b57cec5SDimitry Andric return __ambiguous; 4040b57cec5SDimitry Andric } 4050b57cec5SDimitry Andric __result = __i; 4060b57cec5SDimitry Andric } 4070b57cec5SDimitry Andric } 4080b57cec5SDimitry Andric return __result; 4090b57cec5SDimitry Andric} 4100b57cec5SDimitry Andric 4110b57cec5SDimitry Andrictemplate <size_t _Index> 4120b57cec5SDimitry Andricstruct __find_unambiguous_index_sfinae_impl 4130b57cec5SDimitry Andric : integral_constant<size_t, _Index> {}; 4140b57cec5SDimitry Andric 4150b57cec5SDimitry Andrictemplate <> 4160b57cec5SDimitry Andricstruct __find_unambiguous_index_sfinae_impl<__not_found> {}; 4170b57cec5SDimitry Andric 4180b57cec5SDimitry Andrictemplate <> 4190b57cec5SDimitry Andricstruct __find_unambiguous_index_sfinae_impl<__ambiguous> {}; 4200b57cec5SDimitry Andric 4210b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 4220b57cec5SDimitry Andricstruct __find_unambiguous_index_sfinae 4230b57cec5SDimitry Andric : __find_unambiguous_index_sfinae_impl<__find_index<_Tp, _Types...>()> {}; 4240b57cec5SDimitry Andric 4250b57cec5SDimitry Andric} // namespace __find_detail 4260b57cec5SDimitry Andric 4270b57cec5SDimitry Andricnamespace __variant_detail { 4280b57cec5SDimitry Andric 4290b57cec5SDimitry Andricstruct __valueless_t {}; 4300b57cec5SDimitry Andric 4310b57cec5SDimitry Andricenum class _Trait { _TriviallyAvailable, _Available, _Unavailable }; 4320b57cec5SDimitry Andric 4330b57cec5SDimitry Andrictemplate <typename _Tp, 4340b57cec5SDimitry Andric template <typename> class _IsTriviallyAvailable, 4350b57cec5SDimitry Andric template <typename> class _IsAvailable> 4360b57cec5SDimitry Andricconstexpr _Trait __trait = 4370b57cec5SDimitry Andric _IsTriviallyAvailable<_Tp>::value 4380b57cec5SDimitry Andric ? _Trait::_TriviallyAvailable 4390b57cec5SDimitry Andric : _IsAvailable<_Tp>::value ? _Trait::_Available : _Trait::_Unavailable; 4400b57cec5SDimitry Andric 441*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 4420b57cec5SDimitry Andricconstexpr _Trait __common_trait(initializer_list<_Trait> __traits) { 4430b57cec5SDimitry Andric _Trait __result = _Trait::_TriviallyAvailable; 4440b57cec5SDimitry Andric for (_Trait __t : __traits) { 4450b57cec5SDimitry Andric if (static_cast<int>(__t) > static_cast<int>(__result)) { 4460b57cec5SDimitry Andric __result = __t; 4470b57cec5SDimitry Andric } 4480b57cec5SDimitry Andric } 4490b57cec5SDimitry Andric return __result; 4500b57cec5SDimitry Andric} 4510b57cec5SDimitry Andric 4520b57cec5SDimitry Andrictemplate <typename... _Types> 4530b57cec5SDimitry Andricstruct __traits { 4540b57cec5SDimitry Andric static constexpr _Trait __copy_constructible_trait = 455*bdd1243dSDimitry Andric __variant_detail::__common_trait({__trait<_Types, 4560b57cec5SDimitry Andric is_trivially_copy_constructible, 4570b57cec5SDimitry Andric is_copy_constructible>...}); 4580b57cec5SDimitry Andric 4590b57cec5SDimitry Andric static constexpr _Trait __move_constructible_trait = 460*bdd1243dSDimitry Andric __variant_detail::__common_trait({__trait<_Types, 4610b57cec5SDimitry Andric is_trivially_move_constructible, 4620b57cec5SDimitry Andric is_move_constructible>...}); 4630b57cec5SDimitry Andric 464*bdd1243dSDimitry Andric static constexpr _Trait __copy_assignable_trait = __variant_detail::__common_trait( 4650b57cec5SDimitry Andric {__copy_constructible_trait, 4660b57cec5SDimitry Andric __trait<_Types, is_trivially_copy_assignable, is_copy_assignable>...}); 4670b57cec5SDimitry Andric 468*bdd1243dSDimitry Andric static constexpr _Trait __move_assignable_trait = __variant_detail::__common_trait( 4690b57cec5SDimitry Andric {__move_constructible_trait, 4700b57cec5SDimitry Andric __trait<_Types, is_trivially_move_assignable, is_move_assignable>...}); 4710b57cec5SDimitry Andric 472*bdd1243dSDimitry Andric static constexpr _Trait __destructible_trait = __variant_detail::__common_trait( 4730b57cec5SDimitry Andric {__trait<_Types, is_trivially_destructible, is_destructible>...}); 4740b57cec5SDimitry Andric}; 4750b57cec5SDimitry Andric 4760b57cec5SDimitry Andricnamespace __access { 4770b57cec5SDimitry Andric 4780b57cec5SDimitry Andricstruct __union { 4790b57cec5SDimitry Andric template <class _Vp> 480*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 4810b57cec5SDimitry Andric static constexpr auto&& __get_alt(_Vp&& __v, in_place_index_t<0>) { 4820b57cec5SDimitry Andric return _VSTD::forward<_Vp>(__v).__head; 4830b57cec5SDimitry Andric } 4840b57cec5SDimitry Andric 4850b57cec5SDimitry Andric template <class _Vp, size_t _Ip> 486*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 4870b57cec5SDimitry Andric static constexpr auto&& __get_alt(_Vp&& __v, in_place_index_t<_Ip>) { 4880b57cec5SDimitry Andric return __get_alt(_VSTD::forward<_Vp>(__v).__tail, in_place_index<_Ip - 1>); 4890b57cec5SDimitry Andric } 4900b57cec5SDimitry Andric}; 4910b57cec5SDimitry Andric 4920b57cec5SDimitry Andricstruct __base { 4930b57cec5SDimitry Andric template <size_t _Ip, class _Vp> 494*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 4950b57cec5SDimitry Andric static constexpr auto&& __get_alt(_Vp&& __v) { 4960b57cec5SDimitry Andric return __union::__get_alt(_VSTD::forward<_Vp>(__v).__data, 4970b57cec5SDimitry Andric in_place_index<_Ip>); 4980b57cec5SDimitry Andric } 4990b57cec5SDimitry Andric}; 5000b57cec5SDimitry Andric 5010b57cec5SDimitry Andricstruct __variant { 5020b57cec5SDimitry Andric template <size_t _Ip, class _Vp> 503*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 5040b57cec5SDimitry Andric static constexpr auto&& __get_alt(_Vp&& __v) { 505*bdd1243dSDimitry Andric return __base::__get_alt<_Ip>(_VSTD::forward<_Vp>(__v).__impl_); 5060b57cec5SDimitry Andric } 5070b57cec5SDimitry Andric}; 5080b57cec5SDimitry Andric 5090b57cec5SDimitry Andric} // namespace __access 5100b57cec5SDimitry Andric 5110b57cec5SDimitry Andricnamespace __visitation { 5120b57cec5SDimitry Andric 5130b57cec5SDimitry Andricstruct __base { 5140b57cec5SDimitry Andric template <class _Visitor, class... _Vs> 515*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 5160b57cec5SDimitry Andric static constexpr decltype(auto) 5170b57cec5SDimitry Andric __visit_alt_at(size_t __index, _Visitor&& __visitor, _Vs&&... __vs) { 5180b57cec5SDimitry Andric constexpr auto __fdiagonal = 5190b57cec5SDimitry Andric __make_fdiagonal<_Visitor&&, 5200b57cec5SDimitry Andric decltype(_VSTD::forward<_Vs>(__vs).__as_base())...>(); 5210b57cec5SDimitry Andric return __fdiagonal[__index](_VSTD::forward<_Visitor>(__visitor), 5220b57cec5SDimitry Andric _VSTD::forward<_Vs>(__vs).__as_base()...); 5230b57cec5SDimitry Andric } 5240b57cec5SDimitry Andric 5250b57cec5SDimitry Andric template <class _Visitor, class... _Vs> 526*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 5270b57cec5SDimitry Andric static constexpr decltype(auto) __visit_alt(_Visitor&& __visitor, 5280b57cec5SDimitry Andric _Vs&&... __vs) { 5290b57cec5SDimitry Andric constexpr auto __fmatrix = 5300b57cec5SDimitry Andric __make_fmatrix<_Visitor&&, 5310b57cec5SDimitry Andric decltype(_VSTD::forward<_Vs>(__vs).__as_base())...>(); 5320b57cec5SDimitry Andric return __at(__fmatrix, __vs.index()...)( 5330b57cec5SDimitry Andric _VSTD::forward<_Visitor>(__visitor), 5340b57cec5SDimitry Andric _VSTD::forward<_Vs>(__vs).__as_base()...); 5350b57cec5SDimitry Andric } 5360b57cec5SDimitry Andric 5370b57cec5SDimitry Andricprivate: 5380b57cec5SDimitry Andric template <class _Tp> 539*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 5400b57cec5SDimitry Andric static constexpr const _Tp& __at(const _Tp& __elem) { return __elem; } 5410b57cec5SDimitry Andric 5420b57cec5SDimitry Andric template <class _Tp, size_t _Np, typename... _Indices> 543*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 544fe6060f1SDimitry Andric static constexpr auto&& __at(const __farray<_Tp, _Np>& __elems, 5450b57cec5SDimitry Andric size_t __index, _Indices... __indices) { 5460b57cec5SDimitry Andric return __at(__elems[__index], __indices...); 5470b57cec5SDimitry Andric } 5480b57cec5SDimitry Andric 5490b57cec5SDimitry Andric template <class _Fp, class... _Fs> 5500b57cec5SDimitry Andric static constexpr void __std_visit_visitor_return_type_check() { 5510b57cec5SDimitry Andric static_assert( 5520b57cec5SDimitry Andric __all<is_same_v<_Fp, _Fs>...>::value, 5530b57cec5SDimitry Andric "`std::visit` requires the visitor to have a single return type."); 5540b57cec5SDimitry Andric } 5550b57cec5SDimitry Andric 5560b57cec5SDimitry Andric template <class... _Fs> 557*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 5580b57cec5SDimitry Andric static constexpr auto __make_farray(_Fs&&... __fs) { 559*bdd1243dSDimitry Andric __std_visit_visitor_return_type_check<__remove_cvref_t<_Fs>...>(); 560*bdd1243dSDimitry Andric using __result = __farray<common_type_t<__remove_cvref_t<_Fs>...>, sizeof...(_Fs)>; 5610b57cec5SDimitry Andric return __result{{_VSTD::forward<_Fs>(__fs)...}}; 5620b57cec5SDimitry Andric } 5630b57cec5SDimitry Andric 564e8d8bef9SDimitry Andric template <size_t... _Is> 5650b57cec5SDimitry Andric struct __dispatcher { 5660b57cec5SDimitry Andric template <class _Fp, class... _Vs> 567*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 5680b57cec5SDimitry Andric static constexpr decltype(auto) __dispatch(_Fp __f, _Vs... __vs) { 56981ad6265SDimitry Andric return _VSTD::__invoke( 5700b57cec5SDimitry Andric static_cast<_Fp>(__f), 5710b57cec5SDimitry Andric __access::__base::__get_alt<_Is>(static_cast<_Vs>(__vs))...); 5720b57cec5SDimitry Andric } 5730b57cec5SDimitry Andric }; 5740b57cec5SDimitry Andric 5750b57cec5SDimitry Andric template <class _Fp, class... _Vs, size_t... _Is> 576*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 5770b57cec5SDimitry Andric static constexpr auto __make_dispatch(index_sequence<_Is...>) { 5780b57cec5SDimitry Andric return __dispatcher<_Is...>::template __dispatch<_Fp, _Vs...>; 5790b57cec5SDimitry Andric } 5800b57cec5SDimitry Andric 5810b57cec5SDimitry Andric template <size_t _Ip, class _Fp, class... _Vs> 582*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 5830b57cec5SDimitry Andric static constexpr auto __make_fdiagonal_impl() { 5840b57cec5SDimitry Andric return __make_dispatch<_Fp, _Vs...>( 58581ad6265SDimitry Andric index_sequence<((void)__type_identity<_Vs>{}, _Ip)...>{}); 5860b57cec5SDimitry Andric } 5870b57cec5SDimitry Andric 5880b57cec5SDimitry Andric template <class _Fp, class... _Vs, size_t... _Is> 589*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 5900b57cec5SDimitry Andric static constexpr auto __make_fdiagonal_impl(index_sequence<_Is...>) { 5910b57cec5SDimitry Andric return __base::__make_farray(__make_fdiagonal_impl<_Is, _Fp, _Vs...>()...); 5920b57cec5SDimitry Andric } 5930b57cec5SDimitry Andric 5940b57cec5SDimitry Andric template <class _Fp, class _Vp, class... _Vs> 595*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 5960b57cec5SDimitry Andric static constexpr auto __make_fdiagonal() { 597*bdd1243dSDimitry Andric constexpr size_t _Np = __remove_cvref_t<_Vp>::__size(); 598*bdd1243dSDimitry Andric static_assert(__all<(_Np == __remove_cvref_t<_Vs>::__size())...>::value); 5990b57cec5SDimitry Andric return __make_fdiagonal_impl<_Fp, _Vp, _Vs...>(make_index_sequence<_Np>{}); 6000b57cec5SDimitry Andric } 6010b57cec5SDimitry Andric 6020b57cec5SDimitry Andric template <class _Fp, class... _Vs, size_t... _Is> 603*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 6040b57cec5SDimitry Andric static constexpr auto __make_fmatrix_impl(index_sequence<_Is...> __is) { 6050b57cec5SDimitry Andric return __make_dispatch<_Fp, _Vs...>(__is); 6060b57cec5SDimitry Andric } 6070b57cec5SDimitry Andric 6080b57cec5SDimitry Andric template <class _Fp, class... _Vs, size_t... _Is, size_t... _Js, class... _Ls> 609*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 6100b57cec5SDimitry Andric static constexpr auto __make_fmatrix_impl(index_sequence<_Is...>, 6110b57cec5SDimitry Andric index_sequence<_Js...>, 6120b57cec5SDimitry Andric _Ls... __ls) { 6130b57cec5SDimitry Andric return __base::__make_farray(__make_fmatrix_impl<_Fp, _Vs...>( 6140b57cec5SDimitry Andric index_sequence<_Is..., _Js>{}, __ls...)...); 6150b57cec5SDimitry Andric } 6160b57cec5SDimitry Andric 6170b57cec5SDimitry Andric template <class _Fp, class... _Vs> 618*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 6190b57cec5SDimitry Andric static constexpr auto __make_fmatrix() { 6200b57cec5SDimitry Andric return __make_fmatrix_impl<_Fp, _Vs...>( 621*bdd1243dSDimitry Andric index_sequence<>{}, make_index_sequence<__remove_cvref_t<_Vs>::__size()>{}...); 6220b57cec5SDimitry Andric } 6230b57cec5SDimitry Andric}; 6240b57cec5SDimitry Andric 6250b57cec5SDimitry Andricstruct __variant { 6260b57cec5SDimitry Andric template <class _Visitor, class... _Vs> 627*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 6280b57cec5SDimitry Andric static constexpr decltype(auto) 6290b57cec5SDimitry Andric __visit_alt_at(size_t __index, _Visitor&& __visitor, _Vs&&... __vs) { 6300b57cec5SDimitry Andric return __base::__visit_alt_at(__index, 6310b57cec5SDimitry Andric _VSTD::forward<_Visitor>(__visitor), 632*bdd1243dSDimitry Andric _VSTD::forward<_Vs>(__vs).__impl_...); 6330b57cec5SDimitry Andric } 6340b57cec5SDimitry Andric 6350b57cec5SDimitry Andric template <class _Visitor, class... _Vs> 636*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 6370b57cec5SDimitry Andric static constexpr decltype(auto) __visit_alt(_Visitor&& __visitor, 6380b57cec5SDimitry Andric _Vs&&... __vs) { 639fe6060f1SDimitry Andric return __base::__visit_alt( 640fe6060f1SDimitry Andric _VSTD::forward<_Visitor>(__visitor), 641*bdd1243dSDimitry Andric _VSTD::__as_variant(_VSTD::forward<_Vs>(__vs)).__impl_...); 6420b57cec5SDimitry Andric } 6430b57cec5SDimitry Andric 6440b57cec5SDimitry Andric template <class _Visitor, class... _Vs> 645*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 6460b57cec5SDimitry Andric static constexpr decltype(auto) 6470b57cec5SDimitry Andric __visit_value_at(size_t __index, _Visitor&& __visitor, _Vs&&... __vs) { 6480b57cec5SDimitry Andric return __visit_alt_at( 6490b57cec5SDimitry Andric __index, 6500b57cec5SDimitry Andric __make_value_visitor(_VSTD::forward<_Visitor>(__visitor)), 6510b57cec5SDimitry Andric _VSTD::forward<_Vs>(__vs)...); 6520b57cec5SDimitry Andric } 6530b57cec5SDimitry Andric 6540b57cec5SDimitry Andric template <class _Visitor, class... _Vs> 655*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 6560b57cec5SDimitry Andric static constexpr decltype(auto) __visit_value(_Visitor&& __visitor, 6570b57cec5SDimitry Andric _Vs&&... __vs) { 6580b57cec5SDimitry Andric return __visit_alt( 6590b57cec5SDimitry Andric __make_value_visitor(_VSTD::forward<_Visitor>(__visitor)), 6600b57cec5SDimitry Andric _VSTD::forward<_Vs>(__vs)...); 6610b57cec5SDimitry Andric } 662fe6060f1SDimitry Andric 663e8d8bef9SDimitry Andric#if _LIBCPP_STD_VER > 17 664e8d8bef9SDimitry Andric template <class _Rp, class _Visitor, class... _Vs> 665*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 666e8d8bef9SDimitry Andric static constexpr _Rp __visit_value(_Visitor&& __visitor, 667e8d8bef9SDimitry Andric _Vs&&... __vs) { 668e8d8bef9SDimitry Andric return __visit_alt( 669e8d8bef9SDimitry Andric __make_value_visitor<_Rp>(_VSTD::forward<_Visitor>(__visitor)), 670e8d8bef9SDimitry Andric _VSTD::forward<_Vs>(__vs)...); 671e8d8bef9SDimitry Andric } 672e8d8bef9SDimitry Andric#endif 6730b57cec5SDimitry Andric 6740b57cec5SDimitry Andricprivate: 6750b57cec5SDimitry Andric template <class _Visitor, class... _Values> 6760b57cec5SDimitry Andric static constexpr void __std_visit_exhaustive_visitor_check() { 6770b57cec5SDimitry Andric static_assert(is_invocable_v<_Visitor, _Values...>, 6780b57cec5SDimitry Andric "`std::visit` requires the visitor to be exhaustive."); 6790b57cec5SDimitry Andric } 6800b57cec5SDimitry Andric 6810b57cec5SDimitry Andric template <class _Visitor> 6820b57cec5SDimitry Andric struct __value_visitor { 6830b57cec5SDimitry Andric template <class... _Alts> 684*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 6850b57cec5SDimitry Andric constexpr decltype(auto) operator()(_Alts&&... __alts) const { 6860b57cec5SDimitry Andric __std_visit_exhaustive_visitor_check< 6870b57cec5SDimitry Andric _Visitor, 6880b57cec5SDimitry Andric decltype((_VSTD::forward<_Alts>(__alts).__value))...>(); 68981ad6265SDimitry Andric return _VSTD::__invoke(_VSTD::forward<_Visitor>(__visitor), 6900b57cec5SDimitry Andric _VSTD::forward<_Alts>(__alts).__value...); 6910b57cec5SDimitry Andric } 6920b57cec5SDimitry Andric _Visitor&& __visitor; 6930b57cec5SDimitry Andric }; 6940b57cec5SDimitry Andric 695e8d8bef9SDimitry Andric#if _LIBCPP_STD_VER > 17 696e8d8bef9SDimitry Andric template <class _Rp, class _Visitor> 697e8d8bef9SDimitry Andric struct __value_visitor_return_type { 698e8d8bef9SDimitry Andric template <class... _Alts> 699*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 700e8d8bef9SDimitry Andric constexpr _Rp operator()(_Alts&&... __alts) const { 701e8d8bef9SDimitry Andric __std_visit_exhaustive_visitor_check< 702e8d8bef9SDimitry Andric _Visitor, 703e8d8bef9SDimitry Andric decltype((_VSTD::forward<_Alts>(__alts).__value))...>(); 704e8d8bef9SDimitry Andric if constexpr (is_void_v<_Rp>) { 70581ad6265SDimitry Andric _VSTD::__invoke(_VSTD::forward<_Visitor>(__visitor), 706e8d8bef9SDimitry Andric _VSTD::forward<_Alts>(__alts).__value...); 707e8d8bef9SDimitry Andric } 708e8d8bef9SDimitry Andric else { 70981ad6265SDimitry Andric return _VSTD::__invoke(_VSTD::forward<_Visitor>(__visitor), 710e8d8bef9SDimitry Andric _VSTD::forward<_Alts>(__alts).__value...); 711e8d8bef9SDimitry Andric } 712e8d8bef9SDimitry Andric } 713e8d8bef9SDimitry Andric 714e8d8bef9SDimitry Andric _Visitor&& __visitor; 715e8d8bef9SDimitry Andric }; 716e8d8bef9SDimitry Andric#endif 717e8d8bef9SDimitry Andric 7180b57cec5SDimitry Andric template <class _Visitor> 719*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 7200b57cec5SDimitry Andric static constexpr auto __make_value_visitor(_Visitor&& __visitor) { 7210b57cec5SDimitry Andric return __value_visitor<_Visitor>{_VSTD::forward<_Visitor>(__visitor)}; 7220b57cec5SDimitry Andric } 723e8d8bef9SDimitry Andric 724e8d8bef9SDimitry Andric#if _LIBCPP_STD_VER > 17 725e8d8bef9SDimitry Andric template <class _Rp, class _Visitor> 726*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 727e8d8bef9SDimitry Andric static constexpr auto __make_value_visitor(_Visitor&& __visitor) { 728e8d8bef9SDimitry Andric return __value_visitor_return_type<_Rp, _Visitor>{_VSTD::forward<_Visitor>(__visitor)}; 729e8d8bef9SDimitry Andric } 730e8d8bef9SDimitry Andric#endif 7310b57cec5SDimitry Andric}; 7320b57cec5SDimitry Andric 7330b57cec5SDimitry Andric} // namespace __visitation 7340b57cec5SDimitry Andric 7350b57cec5SDimitry Andrictemplate <size_t _Index, class _Tp> 7360b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS __alt { 7370b57cec5SDimitry Andric using __value_type = _Tp; 7380b57cec5SDimitry Andric 7390b57cec5SDimitry Andric template <class... _Args> 740*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 7410b57cec5SDimitry Andric explicit constexpr __alt(in_place_t, _Args&&... __args) 7420b57cec5SDimitry Andric : __value(_VSTD::forward<_Args>(__args)...) {} 7430b57cec5SDimitry Andric 7440b57cec5SDimitry Andric __value_type __value; 7450b57cec5SDimitry Andric}; 7460b57cec5SDimitry Andric 7470b57cec5SDimitry Andrictemplate <_Trait _DestructibleTrait, size_t _Index, class... _Types> 7480b57cec5SDimitry Andricunion _LIBCPP_TEMPLATE_VIS __union; 7490b57cec5SDimitry Andric 7500b57cec5SDimitry Andrictemplate <_Trait _DestructibleTrait, size_t _Index> 7510b57cec5SDimitry Andricunion _LIBCPP_TEMPLATE_VIS __union<_DestructibleTrait, _Index> {}; 7520b57cec5SDimitry Andric 7530b57cec5SDimitry Andric#define _LIBCPP_VARIANT_UNION(destructible_trait, destructor) \ 7540b57cec5SDimitry Andric template <size_t _Index, class _Tp, class... _Types> \ 7550b57cec5SDimitry Andric union _LIBCPP_TEMPLATE_VIS __union<destructible_trait, \ 7560b57cec5SDimitry Andric _Index, \ 7570b57cec5SDimitry Andric _Tp, \ 7580b57cec5SDimitry Andric _Types...> { \ 7590b57cec5SDimitry Andric public: \ 760*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI \ 7610b57cec5SDimitry Andric explicit constexpr __union(__valueless_t) noexcept : __dummy{} {} \ 7620b57cec5SDimitry Andric \ 7630b57cec5SDimitry Andric template <class... _Args> \ 764*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI \ 7650b57cec5SDimitry Andric explicit constexpr __union(in_place_index_t<0>, _Args&&... __args) \ 7660b57cec5SDimitry Andric : __head(in_place, _VSTD::forward<_Args>(__args)...) {} \ 7670b57cec5SDimitry Andric \ 7680b57cec5SDimitry Andric template <size_t _Ip, class... _Args> \ 769*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI \ 7700b57cec5SDimitry Andric explicit constexpr __union(in_place_index_t<_Ip>, _Args&&... __args) \ 7710b57cec5SDimitry Andric : __tail(in_place_index<_Ip - 1>, _VSTD::forward<_Args>(__args)...) {} \ 7720b57cec5SDimitry Andric \ 7730b57cec5SDimitry Andric __union(const __union&) = default; \ 7740b57cec5SDimitry Andric __union(__union&&) = default; \ 7750b57cec5SDimitry Andric \ 7760b57cec5SDimitry Andric destructor \ 7770b57cec5SDimitry Andric \ 7780b57cec5SDimitry Andric __union& operator=(const __union&) = default; \ 7790b57cec5SDimitry Andric __union& operator=(__union&&) = default; \ 7800b57cec5SDimitry Andric \ 7810b57cec5SDimitry Andric private: \ 7820b57cec5SDimitry Andric char __dummy; \ 7830b57cec5SDimitry Andric __alt<_Index, _Tp> __head; \ 7840b57cec5SDimitry Andric __union<destructible_trait, _Index + 1, _Types...> __tail; \ 7850b57cec5SDimitry Andric \ 7860b57cec5SDimitry Andric friend struct __access::__union; \ 7870b57cec5SDimitry Andric } 7880b57cec5SDimitry Andric 7890b57cec5SDimitry Andric_LIBCPP_VARIANT_UNION(_Trait::_TriviallyAvailable, ~__union() = default;); 7900b57cec5SDimitry Andric_LIBCPP_VARIANT_UNION(_Trait::_Available, ~__union() {}); 7910b57cec5SDimitry Andric_LIBCPP_VARIANT_UNION(_Trait::_Unavailable, ~__union() = delete;); 7920b57cec5SDimitry Andric 7930b57cec5SDimitry Andric#undef _LIBCPP_VARIANT_UNION 7940b57cec5SDimitry Andric 7950b57cec5SDimitry Andrictemplate <_Trait _DestructibleTrait, class... _Types> 7960b57cec5SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __base { 7970b57cec5SDimitry Andricpublic: 7980b57cec5SDimitry Andric using __index_t = __variant_index_t<sizeof...(_Types)>; 7990b57cec5SDimitry Andric 800*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 801753f127fSDimitry Andric explicit constexpr __base(__valueless_t __tag) noexcept 802753f127fSDimitry Andric : __data(__tag), __index(__variant_npos<__index_t>) {} 8030b57cec5SDimitry Andric 8040b57cec5SDimitry Andric template <size_t _Ip, class... _Args> 805*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 8060b57cec5SDimitry Andric explicit constexpr __base(in_place_index_t<_Ip>, _Args&&... __args) 8070b57cec5SDimitry Andric : 8080b57cec5SDimitry Andric __data(in_place_index<_Ip>, _VSTD::forward<_Args>(__args)...), 8090b57cec5SDimitry Andric __index(_Ip) {} 8100b57cec5SDimitry Andric 811*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 8120b57cec5SDimitry Andric constexpr bool valueless_by_exception() const noexcept { 8130b57cec5SDimitry Andric return index() == variant_npos; 8140b57cec5SDimitry Andric } 8150b57cec5SDimitry Andric 816*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 8170b57cec5SDimitry Andric constexpr size_t index() const noexcept { 8180b57cec5SDimitry Andric return __index == __variant_npos<__index_t> ? variant_npos : __index; 8190b57cec5SDimitry Andric } 8200b57cec5SDimitry Andric 8210b57cec5SDimitry Andricprotected: 822*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 8230b57cec5SDimitry Andric constexpr auto&& __as_base() & { return *this; } 8240b57cec5SDimitry Andric 825*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 8260b57cec5SDimitry Andric constexpr auto&& __as_base() && { return _VSTD::move(*this); } 8270b57cec5SDimitry Andric 828*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 8290b57cec5SDimitry Andric constexpr auto&& __as_base() const & { return *this; } 8300b57cec5SDimitry Andric 831*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 8320b57cec5SDimitry Andric constexpr auto&& __as_base() const && { return _VSTD::move(*this); } 8330b57cec5SDimitry Andric 834*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 8350b57cec5SDimitry Andric static constexpr size_t __size() { return sizeof...(_Types); } 8360b57cec5SDimitry Andric 8370b57cec5SDimitry Andric __union<_DestructibleTrait, 0, _Types...> __data; 8380b57cec5SDimitry Andric __index_t __index; 8390b57cec5SDimitry Andric 8400b57cec5SDimitry Andric friend struct __access::__base; 8410b57cec5SDimitry Andric friend struct __visitation::__base; 8420b57cec5SDimitry Andric}; 8430b57cec5SDimitry Andric 8440b57cec5SDimitry Andrictemplate <class _Traits, _Trait = _Traits::__destructible_trait> 845e8d8bef9SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __dtor; 8460b57cec5SDimitry Andric 8470b57cec5SDimitry Andric#define _LIBCPP_VARIANT_DESTRUCTOR(destructible_trait, destructor, destroy) \ 8480b57cec5SDimitry Andric template <class... _Types> \ 849e8d8bef9SDimitry Andric class _LIBCPP_TEMPLATE_VIS __dtor<__traits<_Types...>, \ 8500b57cec5SDimitry Andric destructible_trait> \ 8510b57cec5SDimitry Andric : public __base<destructible_trait, _Types...> { \ 8520b57cec5SDimitry Andric using __base_type = __base<destructible_trait, _Types...>; \ 8530b57cec5SDimitry Andric using __index_t = typename __base_type::__index_t; \ 8540b57cec5SDimitry Andric \ 8550b57cec5SDimitry Andric public: \ 8560b57cec5SDimitry Andric using __base_type::__base_type; \ 8570b57cec5SDimitry Andric using __base_type::operator=; \ 8580b57cec5SDimitry Andric \ 859e8d8bef9SDimitry Andric __dtor(const __dtor&) = default; \ 860e8d8bef9SDimitry Andric __dtor(__dtor&&) = default; \ 8610b57cec5SDimitry Andric destructor \ 862e8d8bef9SDimitry Andric __dtor& operator=(const __dtor&) = default; \ 863e8d8bef9SDimitry Andric __dtor& operator=(__dtor&&) = default; \ 8640b57cec5SDimitry Andric \ 8650b57cec5SDimitry Andric protected: \ 866*bdd1243dSDimitry Andric inline _LIBCPP_HIDE_FROM_ABI \ 8670b57cec5SDimitry Andric destroy \ 8680b57cec5SDimitry Andric } 8690b57cec5SDimitry Andric 8700b57cec5SDimitry Andric_LIBCPP_VARIANT_DESTRUCTOR( 8710b57cec5SDimitry Andric _Trait::_TriviallyAvailable, 872e8d8bef9SDimitry Andric ~__dtor() = default;, 8730b57cec5SDimitry Andric void __destroy() noexcept { this->__index = __variant_npos<__index_t>; }); 8740b57cec5SDimitry Andric 8750b57cec5SDimitry Andric_LIBCPP_VARIANT_DESTRUCTOR( 8760b57cec5SDimitry Andric _Trait::_Available, 877e8d8bef9SDimitry Andric ~__dtor() { __destroy(); }, 8780b57cec5SDimitry Andric void __destroy() noexcept { 8790b57cec5SDimitry Andric if (!this->valueless_by_exception()) { 8800b57cec5SDimitry Andric __visitation::__base::__visit_alt( 8810b57cec5SDimitry Andric [](auto& __alt) noexcept { 882*bdd1243dSDimitry Andric using __alt_type = __remove_cvref_t<decltype(__alt)>; 8830b57cec5SDimitry Andric __alt.~__alt_type(); 8840b57cec5SDimitry Andric }, 8850b57cec5SDimitry Andric *this); 8860b57cec5SDimitry Andric } 8870b57cec5SDimitry Andric this->__index = __variant_npos<__index_t>; 8880b57cec5SDimitry Andric }); 8890b57cec5SDimitry Andric 8900b57cec5SDimitry Andric_LIBCPP_VARIANT_DESTRUCTOR( 8910b57cec5SDimitry Andric _Trait::_Unavailable, 892e8d8bef9SDimitry Andric ~__dtor() = delete;, 8930b57cec5SDimitry Andric void __destroy() noexcept = delete;); 8940b57cec5SDimitry Andric 8950b57cec5SDimitry Andric#undef _LIBCPP_VARIANT_DESTRUCTOR 8960b57cec5SDimitry Andric 8970b57cec5SDimitry Andrictemplate <class _Traits> 898e8d8bef9SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __ctor : public __dtor<_Traits> { 899e8d8bef9SDimitry Andric using __base_type = __dtor<_Traits>; 9000b57cec5SDimitry Andric 9010b57cec5SDimitry Andricpublic: 9020b57cec5SDimitry Andric using __base_type::__base_type; 9030b57cec5SDimitry Andric using __base_type::operator=; 9040b57cec5SDimitry Andric 9050b57cec5SDimitry Andricprotected: 9060b57cec5SDimitry Andric template <size_t _Ip, class _Tp, class... _Args> 907*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 9080b57cec5SDimitry Andric static _Tp& __construct_alt(__alt<_Ip, _Tp>& __a, _Args&&... __args) { 9090b57cec5SDimitry Andric ::new ((void*)_VSTD::addressof(__a)) 9100b57cec5SDimitry Andric __alt<_Ip, _Tp>(in_place, _VSTD::forward<_Args>(__args)...); 9110b57cec5SDimitry Andric return __a.__value; 9120b57cec5SDimitry Andric } 9130b57cec5SDimitry Andric 9140b57cec5SDimitry Andric template <class _Rhs> 915*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 916e8d8bef9SDimitry Andric static void __generic_construct(__ctor& __lhs, _Rhs&& __rhs) { 9170b57cec5SDimitry Andric __lhs.__destroy(); 9180b57cec5SDimitry Andric if (!__rhs.valueless_by_exception()) { 9190b57cec5SDimitry Andric __visitation::__base::__visit_alt_at( 9200b57cec5SDimitry Andric __rhs.index(), 9210b57cec5SDimitry Andric [](auto& __lhs_alt, auto&& __rhs_alt) { 9220b57cec5SDimitry Andric __construct_alt( 9230b57cec5SDimitry Andric __lhs_alt, 9240b57cec5SDimitry Andric _VSTD::forward<decltype(__rhs_alt)>(__rhs_alt).__value); 9250b57cec5SDimitry Andric }, 9260b57cec5SDimitry Andric __lhs, _VSTD::forward<_Rhs>(__rhs)); 9270b57cec5SDimitry Andric __lhs.__index = __rhs.index(); 9280b57cec5SDimitry Andric } 9290b57cec5SDimitry Andric } 9300b57cec5SDimitry Andric}; 9310b57cec5SDimitry Andric 9320b57cec5SDimitry Andrictemplate <class _Traits, _Trait = _Traits::__move_constructible_trait> 9330b57cec5SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __move_constructor; 9340b57cec5SDimitry Andric 9350b57cec5SDimitry Andric#define _LIBCPP_VARIANT_MOVE_CONSTRUCTOR(move_constructible_trait, \ 9360b57cec5SDimitry Andric move_constructor) \ 9370b57cec5SDimitry Andric template <class... _Types> \ 9380b57cec5SDimitry Andric class _LIBCPP_TEMPLATE_VIS __move_constructor<__traits<_Types...>, \ 9390b57cec5SDimitry Andric move_constructible_trait> \ 940e8d8bef9SDimitry Andric : public __ctor<__traits<_Types...>> { \ 941e8d8bef9SDimitry Andric using __base_type = __ctor<__traits<_Types...>>; \ 9420b57cec5SDimitry Andric \ 9430b57cec5SDimitry Andric public: \ 9440b57cec5SDimitry Andric using __base_type::__base_type; \ 9450b57cec5SDimitry Andric using __base_type::operator=; \ 9460b57cec5SDimitry Andric \ 9470b57cec5SDimitry Andric __move_constructor(const __move_constructor&) = default; \ 9480b57cec5SDimitry Andric move_constructor \ 9490b57cec5SDimitry Andric ~__move_constructor() = default; \ 9500b57cec5SDimitry Andric __move_constructor& operator=(const __move_constructor&) = default; \ 9510b57cec5SDimitry Andric __move_constructor& operator=(__move_constructor&&) = default; \ 9520b57cec5SDimitry Andric } 9530b57cec5SDimitry Andric 9540b57cec5SDimitry Andric_LIBCPP_VARIANT_MOVE_CONSTRUCTOR( 9550b57cec5SDimitry Andric _Trait::_TriviallyAvailable, 9560b57cec5SDimitry Andric __move_constructor(__move_constructor&& __that) = default;); 9570b57cec5SDimitry Andric 9580b57cec5SDimitry Andric_LIBCPP_VARIANT_MOVE_CONSTRUCTOR( 9590b57cec5SDimitry Andric _Trait::_Available, 9600b57cec5SDimitry Andric __move_constructor(__move_constructor&& __that) noexcept( 9610b57cec5SDimitry Andric __all<is_nothrow_move_constructible_v<_Types>...>::value) 9620b57cec5SDimitry Andric : __move_constructor(__valueless_t{}) { 9630b57cec5SDimitry Andric this->__generic_construct(*this, _VSTD::move(__that)); 9640b57cec5SDimitry Andric }); 9650b57cec5SDimitry Andric 9660b57cec5SDimitry Andric_LIBCPP_VARIANT_MOVE_CONSTRUCTOR( 9670b57cec5SDimitry Andric _Trait::_Unavailable, 9680b57cec5SDimitry Andric __move_constructor(__move_constructor&&) = delete;); 9690b57cec5SDimitry Andric 9700b57cec5SDimitry Andric#undef _LIBCPP_VARIANT_MOVE_CONSTRUCTOR 9710b57cec5SDimitry Andric 9720b57cec5SDimitry Andrictemplate <class _Traits, _Trait = _Traits::__copy_constructible_trait> 9730b57cec5SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __copy_constructor; 9740b57cec5SDimitry Andric 9750b57cec5SDimitry Andric#define _LIBCPP_VARIANT_COPY_CONSTRUCTOR(copy_constructible_trait, \ 9760b57cec5SDimitry Andric copy_constructor) \ 9770b57cec5SDimitry Andric template <class... _Types> \ 9780b57cec5SDimitry Andric class _LIBCPP_TEMPLATE_VIS __copy_constructor<__traits<_Types...>, \ 9790b57cec5SDimitry Andric copy_constructible_trait> \ 9800b57cec5SDimitry Andric : public __move_constructor<__traits<_Types...>> { \ 9810b57cec5SDimitry Andric using __base_type = __move_constructor<__traits<_Types...>>; \ 9820b57cec5SDimitry Andric \ 9830b57cec5SDimitry Andric public: \ 9840b57cec5SDimitry Andric using __base_type::__base_type; \ 9850b57cec5SDimitry Andric using __base_type::operator=; \ 9860b57cec5SDimitry Andric \ 9870b57cec5SDimitry Andric copy_constructor \ 9880b57cec5SDimitry Andric __copy_constructor(__copy_constructor&&) = default; \ 9890b57cec5SDimitry Andric ~__copy_constructor() = default; \ 9900b57cec5SDimitry Andric __copy_constructor& operator=(const __copy_constructor&) = default; \ 9910b57cec5SDimitry Andric __copy_constructor& operator=(__copy_constructor&&) = default; \ 9920b57cec5SDimitry Andric } 9930b57cec5SDimitry Andric 9940b57cec5SDimitry Andric_LIBCPP_VARIANT_COPY_CONSTRUCTOR( 9950b57cec5SDimitry Andric _Trait::_TriviallyAvailable, 9960b57cec5SDimitry Andric __copy_constructor(const __copy_constructor& __that) = default;); 9970b57cec5SDimitry Andric 9980b57cec5SDimitry Andric_LIBCPP_VARIANT_COPY_CONSTRUCTOR( 9990b57cec5SDimitry Andric _Trait::_Available, 10000b57cec5SDimitry Andric __copy_constructor(const __copy_constructor& __that) 10010b57cec5SDimitry Andric : __copy_constructor(__valueless_t{}) { 10020b57cec5SDimitry Andric this->__generic_construct(*this, __that); 10030b57cec5SDimitry Andric }); 10040b57cec5SDimitry Andric 10050b57cec5SDimitry Andric_LIBCPP_VARIANT_COPY_CONSTRUCTOR( 10060b57cec5SDimitry Andric _Trait::_Unavailable, 10070b57cec5SDimitry Andric __copy_constructor(const __copy_constructor&) = delete;); 10080b57cec5SDimitry Andric 10090b57cec5SDimitry Andric#undef _LIBCPP_VARIANT_COPY_CONSTRUCTOR 10100b57cec5SDimitry Andric 10110b57cec5SDimitry Andrictemplate <class _Traits> 10120b57cec5SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __assignment : public __copy_constructor<_Traits> { 10130b57cec5SDimitry Andric using __base_type = __copy_constructor<_Traits>; 10140b57cec5SDimitry Andric 10150b57cec5SDimitry Andricpublic: 10160b57cec5SDimitry Andric using __base_type::__base_type; 10170b57cec5SDimitry Andric using __base_type::operator=; 10180b57cec5SDimitry Andric 10190b57cec5SDimitry Andric template <size_t _Ip, class... _Args> 1020*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 10210b57cec5SDimitry Andric auto& __emplace(_Args&&... __args) { 10220b57cec5SDimitry Andric this->__destroy(); 10230b57cec5SDimitry Andric auto& __res = this->__construct_alt(__access::__base::__get_alt<_Ip>(*this), 10240b57cec5SDimitry Andric _VSTD::forward<_Args>(__args)...); 10250b57cec5SDimitry Andric this->__index = _Ip; 10260b57cec5SDimitry Andric return __res; 10270b57cec5SDimitry Andric } 10280b57cec5SDimitry Andric 10290b57cec5SDimitry Andricprotected: 10300b57cec5SDimitry Andric template <size_t _Ip, class _Tp, class _Arg> 1031*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 10320b57cec5SDimitry Andric void __assign_alt(__alt<_Ip, _Tp>& __a, _Arg&& __arg) { 10330b57cec5SDimitry Andric if (this->index() == _Ip) { 10340b57cec5SDimitry Andric __a.__value = _VSTD::forward<_Arg>(__arg); 10350b57cec5SDimitry Andric } else { 10360b57cec5SDimitry Andric struct { 10370b57cec5SDimitry Andric void operator()(true_type) const { 10380b57cec5SDimitry Andric __this->__emplace<_Ip>(_VSTD::forward<_Arg>(__arg)); 10390b57cec5SDimitry Andric } 10400b57cec5SDimitry Andric void operator()(false_type) const { 10410b57cec5SDimitry Andric __this->__emplace<_Ip>(_Tp(_VSTD::forward<_Arg>(__arg))); 10420b57cec5SDimitry Andric } 10430b57cec5SDimitry Andric __assignment* __this; 10440b57cec5SDimitry Andric _Arg&& __arg; 10450b57cec5SDimitry Andric } __impl{this, _VSTD::forward<_Arg>(__arg)}; 10460b57cec5SDimitry Andric __impl(bool_constant<is_nothrow_constructible_v<_Tp, _Arg> || 10470b57cec5SDimitry Andric !is_nothrow_move_constructible_v<_Tp>>{}); 10480b57cec5SDimitry Andric } 10490b57cec5SDimitry Andric } 10500b57cec5SDimitry Andric 10510b57cec5SDimitry Andric template <class _That> 1052*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 10530b57cec5SDimitry Andric void __generic_assign(_That&& __that) { 10540b57cec5SDimitry Andric if (this->valueless_by_exception() && __that.valueless_by_exception()) { 10550b57cec5SDimitry Andric // do nothing. 10560b57cec5SDimitry Andric } else if (__that.valueless_by_exception()) { 10570b57cec5SDimitry Andric this->__destroy(); 10580b57cec5SDimitry Andric } else { 10590b57cec5SDimitry Andric __visitation::__base::__visit_alt_at( 10600b57cec5SDimitry Andric __that.index(), 10610b57cec5SDimitry Andric [this](auto& __this_alt, auto&& __that_alt) { 10620b57cec5SDimitry Andric this->__assign_alt( 10630b57cec5SDimitry Andric __this_alt, 10640b57cec5SDimitry Andric _VSTD::forward<decltype(__that_alt)>(__that_alt).__value); 10650b57cec5SDimitry Andric }, 10660b57cec5SDimitry Andric *this, _VSTD::forward<_That>(__that)); 10670b57cec5SDimitry Andric } 10680b57cec5SDimitry Andric } 10690b57cec5SDimitry Andric}; 10700b57cec5SDimitry Andric 10710b57cec5SDimitry Andrictemplate <class _Traits, _Trait = _Traits::__move_assignable_trait> 10720b57cec5SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __move_assignment; 10730b57cec5SDimitry Andric 10740b57cec5SDimitry Andric#define _LIBCPP_VARIANT_MOVE_ASSIGNMENT(move_assignable_trait, \ 10750b57cec5SDimitry Andric move_assignment) \ 10760b57cec5SDimitry Andric template <class... _Types> \ 10770b57cec5SDimitry Andric class _LIBCPP_TEMPLATE_VIS __move_assignment<__traits<_Types...>, \ 10780b57cec5SDimitry Andric move_assignable_trait> \ 10790b57cec5SDimitry Andric : public __assignment<__traits<_Types...>> { \ 10800b57cec5SDimitry Andric using __base_type = __assignment<__traits<_Types...>>; \ 10810b57cec5SDimitry Andric \ 10820b57cec5SDimitry Andric public: \ 10830b57cec5SDimitry Andric using __base_type::__base_type; \ 10840b57cec5SDimitry Andric using __base_type::operator=; \ 10850b57cec5SDimitry Andric \ 10860b57cec5SDimitry Andric __move_assignment(const __move_assignment&) = default; \ 10870b57cec5SDimitry Andric __move_assignment(__move_assignment&&) = default; \ 10880b57cec5SDimitry Andric ~__move_assignment() = default; \ 10890b57cec5SDimitry Andric __move_assignment& operator=(const __move_assignment&) = default; \ 10900b57cec5SDimitry Andric move_assignment \ 10910b57cec5SDimitry Andric } 10920b57cec5SDimitry Andric 10930b57cec5SDimitry Andric_LIBCPP_VARIANT_MOVE_ASSIGNMENT( 10940b57cec5SDimitry Andric _Trait::_TriviallyAvailable, 10950b57cec5SDimitry Andric __move_assignment& operator=(__move_assignment&& __that) = default;); 10960b57cec5SDimitry Andric 10970b57cec5SDimitry Andric_LIBCPP_VARIANT_MOVE_ASSIGNMENT( 10980b57cec5SDimitry Andric _Trait::_Available, 10990b57cec5SDimitry Andric __move_assignment& operator=(__move_assignment&& __that) noexcept( 11000b57cec5SDimitry Andric __all<(is_nothrow_move_constructible_v<_Types> && 11010b57cec5SDimitry Andric is_nothrow_move_assignable_v<_Types>)...>::value) { 11020b57cec5SDimitry Andric this->__generic_assign(_VSTD::move(__that)); 11030b57cec5SDimitry Andric return *this; 11040b57cec5SDimitry Andric }); 11050b57cec5SDimitry Andric 11060b57cec5SDimitry Andric_LIBCPP_VARIANT_MOVE_ASSIGNMENT( 11070b57cec5SDimitry Andric _Trait::_Unavailable, 11080b57cec5SDimitry Andric __move_assignment& operator=(__move_assignment&&) = delete;); 11090b57cec5SDimitry Andric 11100b57cec5SDimitry Andric#undef _LIBCPP_VARIANT_MOVE_ASSIGNMENT 11110b57cec5SDimitry Andric 11120b57cec5SDimitry Andrictemplate <class _Traits, _Trait = _Traits::__copy_assignable_trait> 11130b57cec5SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __copy_assignment; 11140b57cec5SDimitry Andric 11150b57cec5SDimitry Andric#define _LIBCPP_VARIANT_COPY_ASSIGNMENT(copy_assignable_trait, \ 11160b57cec5SDimitry Andric copy_assignment) \ 11170b57cec5SDimitry Andric template <class... _Types> \ 11180b57cec5SDimitry Andric class _LIBCPP_TEMPLATE_VIS __copy_assignment<__traits<_Types...>, \ 11190b57cec5SDimitry Andric copy_assignable_trait> \ 11200b57cec5SDimitry Andric : public __move_assignment<__traits<_Types...>> { \ 11210b57cec5SDimitry Andric using __base_type = __move_assignment<__traits<_Types...>>; \ 11220b57cec5SDimitry Andric \ 11230b57cec5SDimitry Andric public: \ 11240b57cec5SDimitry Andric using __base_type::__base_type; \ 11250b57cec5SDimitry Andric using __base_type::operator=; \ 11260b57cec5SDimitry Andric \ 11270b57cec5SDimitry Andric __copy_assignment(const __copy_assignment&) = default; \ 11280b57cec5SDimitry Andric __copy_assignment(__copy_assignment&&) = default; \ 11290b57cec5SDimitry Andric ~__copy_assignment() = default; \ 11300b57cec5SDimitry Andric copy_assignment \ 11310b57cec5SDimitry Andric __copy_assignment& operator=(__copy_assignment&&) = default; \ 11320b57cec5SDimitry Andric } 11330b57cec5SDimitry Andric 11340b57cec5SDimitry Andric_LIBCPP_VARIANT_COPY_ASSIGNMENT( 11350b57cec5SDimitry Andric _Trait::_TriviallyAvailable, 11360b57cec5SDimitry Andric __copy_assignment& operator=(const __copy_assignment& __that) = default;); 11370b57cec5SDimitry Andric 11380b57cec5SDimitry Andric_LIBCPP_VARIANT_COPY_ASSIGNMENT( 11390b57cec5SDimitry Andric _Trait::_Available, 11400b57cec5SDimitry Andric __copy_assignment& operator=(const __copy_assignment& __that) { 11410b57cec5SDimitry Andric this->__generic_assign(__that); 11420b57cec5SDimitry Andric return *this; 11430b57cec5SDimitry Andric }); 11440b57cec5SDimitry Andric 11450b57cec5SDimitry Andric_LIBCPP_VARIANT_COPY_ASSIGNMENT( 11460b57cec5SDimitry Andric _Trait::_Unavailable, 11470b57cec5SDimitry Andric __copy_assignment& operator=(const __copy_assignment&) = delete;); 11480b57cec5SDimitry Andric 11490b57cec5SDimitry Andric#undef _LIBCPP_VARIANT_COPY_ASSIGNMENT 11500b57cec5SDimitry Andric 11510b57cec5SDimitry Andrictemplate <class... _Types> 11520b57cec5SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __impl 11530b57cec5SDimitry Andric : public __copy_assignment<__traits<_Types...>> { 11540b57cec5SDimitry Andric using __base_type = __copy_assignment<__traits<_Types...>>; 11550b57cec5SDimitry Andric 11560b57cec5SDimitry Andricpublic: 115781ad6265SDimitry Andric using __base_type::__base_type; // get in_place_index_t constructor & friends 115881ad6265SDimitry Andric __impl(__impl const&) = default; 115981ad6265SDimitry Andric __impl(__impl&&) = default; 116081ad6265SDimitry Andric __impl& operator=(__impl const&) = default; 116181ad6265SDimitry Andric __impl& operator=(__impl&&) = default; 11620b57cec5SDimitry Andric 11630b57cec5SDimitry Andric template <size_t _Ip, class _Arg> 1164*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 11650b57cec5SDimitry Andric void __assign(_Arg&& __arg) { 11660b57cec5SDimitry Andric this->__assign_alt(__access::__base::__get_alt<_Ip>(*this), 11670b57cec5SDimitry Andric _VSTD::forward<_Arg>(__arg)); 11680b57cec5SDimitry Andric } 11690b57cec5SDimitry Andric 1170*bdd1243dSDimitry Andric inline _LIBCPP_HIDE_FROM_ABI 11710b57cec5SDimitry Andric void __swap(__impl& __that) { 11720b57cec5SDimitry Andric if (this->valueless_by_exception() && __that.valueless_by_exception()) { 11730b57cec5SDimitry Andric // do nothing. 11740b57cec5SDimitry Andric } else if (this->index() == __that.index()) { 11750b57cec5SDimitry Andric __visitation::__base::__visit_alt_at( 11760b57cec5SDimitry Andric this->index(), 11770b57cec5SDimitry Andric [](auto& __this_alt, auto& __that_alt) { 11780b57cec5SDimitry Andric using _VSTD::swap; 11790b57cec5SDimitry Andric swap(__this_alt.__value, __that_alt.__value); 11800b57cec5SDimitry Andric }, 11810b57cec5SDimitry Andric *this, 11820b57cec5SDimitry Andric __that); 11830b57cec5SDimitry Andric } else { 11840b57cec5SDimitry Andric __impl* __lhs = this; 11850b57cec5SDimitry Andric __impl* __rhs = _VSTD::addressof(__that); 11860b57cec5SDimitry Andric if (__lhs->__move_nothrow() && !__rhs->__move_nothrow()) { 11870b57cec5SDimitry Andric _VSTD::swap(__lhs, __rhs); 11880b57cec5SDimitry Andric } 11890b57cec5SDimitry Andric __impl __tmp(_VSTD::move(*__rhs)); 11900b57cec5SDimitry Andric#ifndef _LIBCPP_NO_EXCEPTIONS 11915ffd83dbSDimitry Andric if constexpr (__all<is_nothrow_move_constructible_v<_Types>...>::value) { 11925ffd83dbSDimitry Andric this->__generic_construct(*__rhs, _VSTD::move(*__lhs)); 11935ffd83dbSDimitry Andric } else { 11940b57cec5SDimitry Andric // EXTENSION: When the move construction of `__lhs` into `__rhs` throws 11950b57cec5SDimitry Andric // and `__tmp` is nothrow move constructible then we move `__tmp` back 11960b57cec5SDimitry Andric // into `__rhs` and provide the strong exception safety guarantee. 11970b57cec5SDimitry Andric try { 11980b57cec5SDimitry Andric this->__generic_construct(*__rhs, _VSTD::move(*__lhs)); 11990b57cec5SDimitry Andric } catch (...) { 12000b57cec5SDimitry Andric if (__tmp.__move_nothrow()) { 12010b57cec5SDimitry Andric this->__generic_construct(*__rhs, _VSTD::move(__tmp)); 12020b57cec5SDimitry Andric } 12030b57cec5SDimitry Andric throw; 12040b57cec5SDimitry Andric } 12055ffd83dbSDimitry Andric } 12060b57cec5SDimitry Andric#else 12075ffd83dbSDimitry Andric // this isn't consolidated with the `if constexpr` branch above due to 12085ffd83dbSDimitry Andric // `throw` being ill-formed with exceptions disabled even when discarded. 12090b57cec5SDimitry Andric this->__generic_construct(*__rhs, _VSTD::move(*__lhs)); 12100b57cec5SDimitry Andric#endif 12110b57cec5SDimitry Andric this->__generic_construct(*__lhs, _VSTD::move(__tmp)); 12120b57cec5SDimitry Andric } 12130b57cec5SDimitry Andric } 12140b57cec5SDimitry Andric 12150b57cec5SDimitry Andricprivate: 1216*bdd1243dSDimitry Andric inline _LIBCPP_HIDE_FROM_ABI 12170b57cec5SDimitry Andric bool __move_nothrow() const { 12180b57cec5SDimitry Andric constexpr bool __results[] = {is_nothrow_move_constructible_v<_Types>...}; 12190b57cec5SDimitry Andric return this->valueless_by_exception() || __results[this->index()]; 12200b57cec5SDimitry Andric } 12210b57cec5SDimitry Andric}; 12220b57cec5SDimitry Andric 12230b57cec5SDimitry Andricstruct __no_narrowing_check { 12240b57cec5SDimitry Andric template <class _Dest, class _Source> 122581ad6265SDimitry Andric using _Apply = __type_identity<_Dest>; 12260b57cec5SDimitry Andric}; 12270b57cec5SDimitry Andric 12280b57cec5SDimitry Andricstruct __narrowing_check { 12290b57cec5SDimitry Andric template <class _Dest> 123081ad6265SDimitry Andric static auto __test_impl(_Dest (&&)[1]) -> __type_identity<_Dest>; 12310b57cec5SDimitry Andric template <class _Dest, class _Source> 1232*bdd1243dSDimitry Andric using _Apply _LIBCPP_NODEBUG = decltype(__test_impl<_Dest>({std::declval<_Source>()})); 12330b57cec5SDimitry Andric}; 12340b57cec5SDimitry Andric 12350b57cec5SDimitry Andrictemplate <class _Dest, class _Source> 1236349cc55cSDimitry Andricusing __check_for_narrowing _LIBCPP_NODEBUG = 12370b57cec5SDimitry Andric typename _If< 12380b57cec5SDimitry Andric#ifdef _LIBCPP_ENABLE_NARROWING_CONVERSIONS_IN_VARIANT 12390b57cec5SDimitry Andric false && 12400b57cec5SDimitry Andric#endif 12410b57cec5SDimitry Andric is_arithmetic<_Dest>::value, 12420b57cec5SDimitry Andric __narrowing_check, 12430b57cec5SDimitry Andric __no_narrowing_check 12440b57cec5SDimitry Andric >::template _Apply<_Dest, _Source>; 12450b57cec5SDimitry Andric 12460b57cec5SDimitry Andrictemplate <class _Tp, size_t _Idx> 12470b57cec5SDimitry Andricstruct __overload { 12480b57cec5SDimitry Andric template <class _Up> 12490b57cec5SDimitry Andric auto operator()(_Tp, _Up&&) const -> __check_for_narrowing<_Tp, _Up>; 12500b57cec5SDimitry Andric}; 12510b57cec5SDimitry Andric 12520b57cec5SDimitry Andrictemplate <class _Tp, size_t> 12530b57cec5SDimitry Andricstruct __overload_bool { 1254*bdd1243dSDimitry Andric template <class _Up, class _Ap = __remove_cvref_t<_Up>> 12550b57cec5SDimitry Andric auto operator()(bool, _Up&&) const 125681ad6265SDimitry Andric -> enable_if_t<is_same_v<_Ap, bool>, __type_identity<_Tp>>; 12570b57cec5SDimitry Andric}; 12580b57cec5SDimitry Andric 12590b57cec5SDimitry Andrictemplate <size_t _Idx> 12600b57cec5SDimitry Andricstruct __overload<bool, _Idx> : __overload_bool<bool, _Idx> {}; 12610b57cec5SDimitry Andrictemplate <size_t _Idx> 12620b57cec5SDimitry Andricstruct __overload<bool const, _Idx> : __overload_bool<bool const, _Idx> {}; 12630b57cec5SDimitry Andrictemplate <size_t _Idx> 12640b57cec5SDimitry Andricstruct __overload<bool volatile, _Idx> : __overload_bool<bool volatile, _Idx> {}; 12650b57cec5SDimitry Andrictemplate <size_t _Idx> 12660b57cec5SDimitry Andricstruct __overload<bool const volatile, _Idx> : __overload_bool<bool const volatile, _Idx> {}; 12670b57cec5SDimitry Andric 12680b57cec5SDimitry Andrictemplate <class ..._Bases> 12690b57cec5SDimitry Andricstruct __all_overloads : _Bases... { 12700b57cec5SDimitry Andric void operator()() const; 12710b57cec5SDimitry Andric using _Bases::operator()...; 12720b57cec5SDimitry Andric}; 12730b57cec5SDimitry Andric 12740b57cec5SDimitry Andrictemplate <class IdxSeq> 12750b57cec5SDimitry Andricstruct __make_overloads_imp; 12760b57cec5SDimitry Andric 12770b57cec5SDimitry Andrictemplate <size_t ..._Idx> 12780b57cec5SDimitry Andricstruct __make_overloads_imp<__tuple_indices<_Idx...> > { 12790b57cec5SDimitry Andric template <class ..._Types> 1280349cc55cSDimitry Andric using _Apply _LIBCPP_NODEBUG = __all_overloads<__overload<_Types, _Idx>...>; 12810b57cec5SDimitry Andric}; 12820b57cec5SDimitry Andric 12830b57cec5SDimitry Andrictemplate <class ..._Types> 1284349cc55cSDimitry Andricusing _MakeOverloads _LIBCPP_NODEBUG = typename __make_overloads_imp< 12850b57cec5SDimitry Andric __make_indices_imp<sizeof...(_Types), 0> >::template _Apply<_Types...>; 12860b57cec5SDimitry Andric 12870b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 12880b57cec5SDimitry Andricusing __best_match_t = 12890b57cec5SDimitry Andric typename invoke_result_t<_MakeOverloads<_Types...>, _Tp, _Tp>::type; 12900b57cec5SDimitry Andric 12911fd87a68SDimitry Andric} // namespace __variant_detail 12920b57cec5SDimitry Andric 12930b57cec5SDimitry Andrictemplate <class... _Types> 12940b57cec5SDimitry Andricclass _LIBCPP_TEMPLATE_VIS variant 12950b57cec5SDimitry Andric : private __sfinae_ctor_base< 12960b57cec5SDimitry Andric __all<is_copy_constructible_v<_Types>...>::value, 12970b57cec5SDimitry Andric __all<is_move_constructible_v<_Types>...>::value>, 12980b57cec5SDimitry Andric private __sfinae_assign_base< 12990b57cec5SDimitry Andric __all<(is_copy_constructible_v<_Types> && 13000b57cec5SDimitry Andric is_copy_assignable_v<_Types>)...>::value, 13010b57cec5SDimitry Andric __all<(is_move_constructible_v<_Types> && 13020b57cec5SDimitry Andric is_move_assignable_v<_Types>)...>::value> { 13030b57cec5SDimitry Andric static_assert(0 < sizeof...(_Types), 13040b57cec5SDimitry Andric "variant must consist of at least one alternative."); 13050b57cec5SDimitry Andric 13060b57cec5SDimitry Andric static_assert(__all<!is_array_v<_Types>...>::value, 13070b57cec5SDimitry Andric "variant can not have an array type as an alternative."); 13080b57cec5SDimitry Andric 13090b57cec5SDimitry Andric static_assert(__all<!is_reference_v<_Types>...>::value, 13100b57cec5SDimitry Andric "variant can not have a reference type as an alternative."); 13110b57cec5SDimitry Andric 13120b57cec5SDimitry Andric static_assert(__all<!is_void_v<_Types>...>::value, 13130b57cec5SDimitry Andric "variant can not have a void type as an alternative."); 13140b57cec5SDimitry Andric 13150b57cec5SDimitry Andric using __first_type = variant_alternative_t<0, variant>; 13160b57cec5SDimitry Andric 13170b57cec5SDimitry Andricpublic: 13180b57cec5SDimitry Andric template <bool _Dummy = true, 13190b57cec5SDimitry Andric enable_if_t<__dependent_type<is_default_constructible<__first_type>, 13200b57cec5SDimitry Andric _Dummy>::value, 13210b57cec5SDimitry Andric int> = 0> 1322*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 13230b57cec5SDimitry Andric constexpr variant() noexcept(is_nothrow_default_constructible_v<__first_type>) 1324*bdd1243dSDimitry Andric : __impl_(in_place_index<0>) {} 13250b57cec5SDimitry Andric 1326*bdd1243dSDimitry Andric constexpr variant(const variant&) = default; 1327*bdd1243dSDimitry Andric constexpr variant(variant&&) = default; 13280b57cec5SDimitry Andric 13290b57cec5SDimitry Andric template < 13300b57cec5SDimitry Andric class _Arg, 1331*bdd1243dSDimitry Andric enable_if_t<!is_same_v<__remove_cvref_t<_Arg>, variant>, int> = 0, 1332*bdd1243dSDimitry Andric enable_if_t<!__is_inplace_type<__remove_cvref_t<_Arg>>::value, int> = 0, 1333*bdd1243dSDimitry Andric enable_if_t<!__is_inplace_index<__remove_cvref_t<_Arg>>::value, int> = 0, 13340b57cec5SDimitry Andric class _Tp = __variant_detail::__best_match_t<_Arg, _Types...>, 13350b57cec5SDimitry Andric size_t _Ip = 13360b57cec5SDimitry Andric __find_detail::__find_unambiguous_index_sfinae<_Tp, _Types...>::value, 13370b57cec5SDimitry Andric enable_if_t<is_constructible_v<_Tp, _Arg>, int> = 0> 1338*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 13390b57cec5SDimitry Andric constexpr variant(_Arg&& __arg) noexcept( 13400b57cec5SDimitry Andric is_nothrow_constructible_v<_Tp, _Arg>) 1341*bdd1243dSDimitry Andric : __impl_(in_place_index<_Ip>, _VSTD::forward<_Arg>(__arg)) {} 13420b57cec5SDimitry Andric 13430b57cec5SDimitry Andric template <size_t _Ip, class... _Args, 13440b57cec5SDimitry Andric class = enable_if_t<(_Ip < sizeof...(_Types)), int>, 13450b57cec5SDimitry Andric class _Tp = variant_alternative_t<_Ip, variant<_Types...>>, 13460b57cec5SDimitry Andric enable_if_t<is_constructible_v<_Tp, _Args...>, int> = 0> 1347*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 13480b57cec5SDimitry Andric explicit constexpr variant( 13490b57cec5SDimitry Andric in_place_index_t<_Ip>, 13500b57cec5SDimitry Andric _Args&&... __args) noexcept(is_nothrow_constructible_v<_Tp, _Args...>) 1351*bdd1243dSDimitry Andric : __impl_(in_place_index<_Ip>, _VSTD::forward<_Args>(__args)...) {} 13520b57cec5SDimitry Andric 13530b57cec5SDimitry Andric template < 13540b57cec5SDimitry Andric size_t _Ip, 13550b57cec5SDimitry Andric class _Up, 13560b57cec5SDimitry Andric class... _Args, 13570b57cec5SDimitry Andric enable_if_t<(_Ip < sizeof...(_Types)), int> = 0, 13580b57cec5SDimitry Andric class _Tp = variant_alternative_t<_Ip, variant<_Types...>>, 13590b57cec5SDimitry Andric enable_if_t<is_constructible_v<_Tp, initializer_list<_Up>&, _Args...>, 13600b57cec5SDimitry Andric int> = 0> 1361*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 13620b57cec5SDimitry Andric explicit constexpr variant( 13630b57cec5SDimitry Andric in_place_index_t<_Ip>, 13640b57cec5SDimitry Andric initializer_list<_Up> __il, 13650b57cec5SDimitry Andric _Args&&... __args) noexcept( 13660b57cec5SDimitry Andric is_nothrow_constructible_v<_Tp, initializer_list<_Up>&, _Args...>) 1367*bdd1243dSDimitry Andric : __impl_(in_place_index<_Ip>, __il, _VSTD::forward<_Args>(__args)...) {} 13680b57cec5SDimitry Andric 13690b57cec5SDimitry Andric template < 13700b57cec5SDimitry Andric class _Tp, 13710b57cec5SDimitry Andric class... _Args, 13720b57cec5SDimitry Andric size_t _Ip = 13730b57cec5SDimitry Andric __find_detail::__find_unambiguous_index_sfinae<_Tp, _Types...>::value, 13740b57cec5SDimitry Andric enable_if_t<is_constructible_v<_Tp, _Args...>, int> = 0> 1375*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 13760b57cec5SDimitry Andric explicit constexpr variant(in_place_type_t<_Tp>, _Args&&... __args) noexcept( 13770b57cec5SDimitry Andric is_nothrow_constructible_v<_Tp, _Args...>) 1378*bdd1243dSDimitry Andric : __impl_(in_place_index<_Ip>, _VSTD::forward<_Args>(__args)...) {} 13790b57cec5SDimitry Andric 13800b57cec5SDimitry Andric template < 13810b57cec5SDimitry Andric class _Tp, 13820b57cec5SDimitry Andric class _Up, 13830b57cec5SDimitry Andric class... _Args, 13840b57cec5SDimitry Andric size_t _Ip = 13850b57cec5SDimitry Andric __find_detail::__find_unambiguous_index_sfinae<_Tp, _Types...>::value, 13860b57cec5SDimitry Andric enable_if_t<is_constructible_v<_Tp, initializer_list<_Up>&, _Args...>, 13870b57cec5SDimitry Andric int> = 0> 1388*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 13890b57cec5SDimitry Andric explicit constexpr variant( 13900b57cec5SDimitry Andric in_place_type_t<_Tp>, 13910b57cec5SDimitry Andric initializer_list<_Up> __il, 13920b57cec5SDimitry Andric _Args&&... __args) noexcept( 13930b57cec5SDimitry Andric is_nothrow_constructible_v<_Tp, initializer_list< _Up>&, _Args...>) 1394*bdd1243dSDimitry Andric : __impl_(in_place_index<_Ip>, __il, _VSTD::forward<_Args>(__args)...) {} 13950b57cec5SDimitry Andric 13960b57cec5SDimitry Andric ~variant() = default; 13970b57cec5SDimitry Andric 1398*bdd1243dSDimitry Andric constexpr variant& operator=(const variant&) = default; 1399*bdd1243dSDimitry Andric constexpr variant& operator=(variant&&) = default; 14000b57cec5SDimitry Andric 14010b57cec5SDimitry Andric template < 14020b57cec5SDimitry Andric class _Arg, 1403*bdd1243dSDimitry Andric enable_if_t<!is_same_v<__remove_cvref_t<_Arg>, variant>, int> = 0, 14040b57cec5SDimitry Andric class _Tp = __variant_detail::__best_match_t<_Arg, _Types...>, 14050b57cec5SDimitry Andric size_t _Ip = 14060b57cec5SDimitry Andric __find_detail::__find_unambiguous_index_sfinae<_Tp, _Types...>::value, 14070b57cec5SDimitry Andric enable_if_t<is_assignable_v<_Tp&, _Arg> && is_constructible_v<_Tp, _Arg>, 14080b57cec5SDimitry Andric int> = 0> 1409*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 14100b57cec5SDimitry Andric variant& operator=(_Arg&& __arg) noexcept( 14110b57cec5SDimitry Andric is_nothrow_assignable_v<_Tp&, _Arg> && 14120b57cec5SDimitry Andric is_nothrow_constructible_v<_Tp, _Arg>) { 1413*bdd1243dSDimitry Andric __impl_.template __assign<_Ip>(_VSTD::forward<_Arg>(__arg)); 14140b57cec5SDimitry Andric return *this; 14150b57cec5SDimitry Andric } 14160b57cec5SDimitry Andric 14170b57cec5SDimitry Andric template < 14180b57cec5SDimitry Andric size_t _Ip, 14190b57cec5SDimitry Andric class... _Args, 14200b57cec5SDimitry Andric enable_if_t<(_Ip < sizeof...(_Types)), int> = 0, 14210b57cec5SDimitry Andric class _Tp = variant_alternative_t<_Ip, variant<_Types...>>, 14220b57cec5SDimitry Andric enable_if_t<is_constructible_v<_Tp, _Args...>, int> = 0> 1423*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 14240b57cec5SDimitry Andric _Tp& emplace(_Args&&... __args) { 1425*bdd1243dSDimitry Andric return __impl_.template __emplace<_Ip>(_VSTD::forward<_Args>(__args)...); 14260b57cec5SDimitry Andric } 14270b57cec5SDimitry Andric 14280b57cec5SDimitry Andric template < 14290b57cec5SDimitry Andric size_t _Ip, 14300b57cec5SDimitry Andric class _Up, 14310b57cec5SDimitry Andric class... _Args, 14320b57cec5SDimitry Andric enable_if_t<(_Ip < sizeof...(_Types)), int> = 0, 14330b57cec5SDimitry Andric class _Tp = variant_alternative_t<_Ip, variant<_Types...>>, 14340b57cec5SDimitry Andric enable_if_t<is_constructible_v<_Tp, initializer_list<_Up>&, _Args...>, 14350b57cec5SDimitry Andric int> = 0> 1436*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 14370b57cec5SDimitry Andric _Tp& emplace(initializer_list<_Up> __il, _Args&&... __args) { 1438*bdd1243dSDimitry Andric return __impl_.template __emplace<_Ip>(__il, _VSTD::forward<_Args>(__args)...); 14390b57cec5SDimitry Andric } 14400b57cec5SDimitry Andric 14410b57cec5SDimitry Andric template < 14420b57cec5SDimitry Andric class _Tp, 14430b57cec5SDimitry Andric class... _Args, 14440b57cec5SDimitry Andric size_t _Ip = 14450b57cec5SDimitry Andric __find_detail::__find_unambiguous_index_sfinae<_Tp, _Types...>::value, 14460b57cec5SDimitry Andric enable_if_t<is_constructible_v<_Tp, _Args...>, int> = 0> 1447*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 14480b57cec5SDimitry Andric _Tp& emplace(_Args&&... __args) { 1449*bdd1243dSDimitry Andric return __impl_.template __emplace<_Ip>(_VSTD::forward<_Args>(__args)...); 14500b57cec5SDimitry Andric } 14510b57cec5SDimitry Andric 14520b57cec5SDimitry Andric template < 14530b57cec5SDimitry Andric class _Tp, 14540b57cec5SDimitry Andric class _Up, 14550b57cec5SDimitry Andric class... _Args, 14560b57cec5SDimitry Andric size_t _Ip = 14570b57cec5SDimitry Andric __find_detail::__find_unambiguous_index_sfinae<_Tp, _Types...>::value, 14580b57cec5SDimitry Andric enable_if_t<is_constructible_v<_Tp, initializer_list<_Up>&, _Args...>, 14590b57cec5SDimitry Andric int> = 0> 1460*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 14610b57cec5SDimitry Andric _Tp& emplace(initializer_list<_Up> __il, _Args&&... __args) { 1462*bdd1243dSDimitry Andric return __impl_.template __emplace<_Ip>(__il, _VSTD::forward<_Args>(__args)...); 14630b57cec5SDimitry Andric } 14640b57cec5SDimitry Andric 1465*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 14660b57cec5SDimitry Andric constexpr bool valueless_by_exception() const noexcept { 1467*bdd1243dSDimitry Andric return __impl_.valueless_by_exception(); 14680b57cec5SDimitry Andric } 14690b57cec5SDimitry Andric 1470*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 1471*bdd1243dSDimitry Andric constexpr size_t index() const noexcept { return __impl_.index(); } 14720b57cec5SDimitry Andric 14730b57cec5SDimitry Andric template < 14740b57cec5SDimitry Andric bool _Dummy = true, 14750b57cec5SDimitry Andric enable_if_t< 14760b57cec5SDimitry Andric __all<( 14770b57cec5SDimitry Andric __dependent_type<is_move_constructible<_Types>, _Dummy>::value && 14780b57cec5SDimitry Andric __dependent_type<is_swappable<_Types>, _Dummy>::value)...>::value, 14790b57cec5SDimitry Andric int> = 0> 1480*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 14810b57cec5SDimitry Andric void swap(variant& __that) noexcept( 14820b57cec5SDimitry Andric __all<(is_nothrow_move_constructible_v<_Types> && 14830b57cec5SDimitry Andric is_nothrow_swappable_v<_Types>)...>::value) { 1484*bdd1243dSDimitry Andric __impl_.__swap(__that.__impl_); 14850b57cec5SDimitry Andric } 14860b57cec5SDimitry Andric 14870b57cec5SDimitry Andricprivate: 1488*bdd1243dSDimitry Andric __variant_detail::__impl<_Types...> __impl_; 14890b57cec5SDimitry Andric 14900b57cec5SDimitry Andric friend struct __variant_detail::__access::__variant; 14910b57cec5SDimitry Andric friend struct __variant_detail::__visitation::__variant; 14920b57cec5SDimitry Andric}; 14930b57cec5SDimitry Andric 14940b57cec5SDimitry Andrictemplate <size_t _Ip, class... _Types> 1495*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 14960b57cec5SDimitry Andricconstexpr bool __holds_alternative(const variant<_Types...>& __v) noexcept { 14970b57cec5SDimitry Andric return __v.index() == _Ip; 14980b57cec5SDimitry Andric} 14990b57cec5SDimitry Andric 15000b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 1501*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 15020b57cec5SDimitry Andricconstexpr bool holds_alternative(const variant<_Types...>& __v) noexcept { 1503*bdd1243dSDimitry Andric return std::__holds_alternative<__find_exactly_one_t<_Tp, _Types...>::value>(__v); 15040b57cec5SDimitry Andric} 15050b57cec5SDimitry Andric 15060b57cec5SDimitry Andrictemplate <size_t _Ip, class _Vp> 1507*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 15080b57cec5SDimitry Andric_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS 15090b57cec5SDimitry Andricconstexpr auto&& __generic_get(_Vp&& __v) { 15100b57cec5SDimitry Andric using __variant_detail::__access::__variant; 1511*bdd1243dSDimitry Andric if (!std::__holds_alternative<_Ip>(__v)) { 15120b57cec5SDimitry Andric __throw_bad_variant_access(); 15130b57cec5SDimitry Andric } 15140b57cec5SDimitry Andric return __variant::__get_alt<_Ip>(_VSTD::forward<_Vp>(__v)).__value; 15150b57cec5SDimitry Andric} 15160b57cec5SDimitry Andric 15170b57cec5SDimitry Andrictemplate <size_t _Ip, class... _Types> 1518*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 15190b57cec5SDimitry Andric_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS 15200b57cec5SDimitry Andricconstexpr variant_alternative_t<_Ip, variant<_Types...>>& get( 15210b57cec5SDimitry Andric variant<_Types...>& __v) { 15220b57cec5SDimitry Andric static_assert(_Ip < sizeof...(_Types)); 15230b57cec5SDimitry Andric static_assert(!is_void_v<variant_alternative_t<_Ip, variant<_Types...>>>); 1524*bdd1243dSDimitry Andric return std::__generic_get<_Ip>(__v); 15250b57cec5SDimitry Andric} 15260b57cec5SDimitry Andric 15270b57cec5SDimitry Andrictemplate <size_t _Ip, class... _Types> 1528*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 15290b57cec5SDimitry Andric_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS 15300b57cec5SDimitry Andricconstexpr variant_alternative_t<_Ip, variant<_Types...>>&& get( 15310b57cec5SDimitry Andric variant<_Types...>&& __v) { 15320b57cec5SDimitry Andric static_assert(_Ip < sizeof...(_Types)); 15330b57cec5SDimitry Andric static_assert(!is_void_v<variant_alternative_t<_Ip, variant<_Types...>>>); 1534*bdd1243dSDimitry Andric return std::__generic_get<_Ip>(_VSTD::move(__v)); 15350b57cec5SDimitry Andric} 15360b57cec5SDimitry Andric 15370b57cec5SDimitry Andrictemplate <size_t _Ip, class... _Types> 1538*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 15390b57cec5SDimitry Andric_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS 15400b57cec5SDimitry Andricconstexpr const variant_alternative_t<_Ip, variant<_Types...>>& get( 15410b57cec5SDimitry Andric const variant<_Types...>& __v) { 15420b57cec5SDimitry Andric static_assert(_Ip < sizeof...(_Types)); 15430b57cec5SDimitry Andric static_assert(!is_void_v<variant_alternative_t<_Ip, variant<_Types...>>>); 1544*bdd1243dSDimitry Andric return std::__generic_get<_Ip>(__v); 15450b57cec5SDimitry Andric} 15460b57cec5SDimitry Andric 15470b57cec5SDimitry Andrictemplate <size_t _Ip, class... _Types> 1548*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 15490b57cec5SDimitry Andric_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS 15500b57cec5SDimitry Andricconstexpr const variant_alternative_t<_Ip, variant<_Types...>>&& get( 15510b57cec5SDimitry Andric const variant<_Types...>&& __v) { 15520b57cec5SDimitry Andric static_assert(_Ip < sizeof...(_Types)); 15530b57cec5SDimitry Andric static_assert(!is_void_v<variant_alternative_t<_Ip, variant<_Types...>>>); 1554*bdd1243dSDimitry Andric return std::__generic_get<_Ip>(_VSTD::move(__v)); 15550b57cec5SDimitry Andric} 15560b57cec5SDimitry Andric 15570b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 1558*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 15590b57cec5SDimitry Andric_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS 15600b57cec5SDimitry Andricconstexpr _Tp& get(variant<_Types...>& __v) { 15610b57cec5SDimitry Andric static_assert(!is_void_v<_Tp>); 15620b57cec5SDimitry Andric return _VSTD::get<__find_exactly_one_t<_Tp, _Types...>::value>(__v); 15630b57cec5SDimitry Andric} 15640b57cec5SDimitry Andric 15650b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 1566*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 15670b57cec5SDimitry Andric_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS 15680b57cec5SDimitry Andricconstexpr _Tp&& get(variant<_Types...>&& __v) { 15690b57cec5SDimitry Andric static_assert(!is_void_v<_Tp>); 15700b57cec5SDimitry Andric return _VSTD::get<__find_exactly_one_t<_Tp, _Types...>::value>( 15710b57cec5SDimitry Andric _VSTD::move(__v)); 15720b57cec5SDimitry Andric} 15730b57cec5SDimitry Andric 15740b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 1575*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 15760b57cec5SDimitry Andric_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS 15770b57cec5SDimitry Andricconstexpr const _Tp& get(const variant<_Types...>& __v) { 15780b57cec5SDimitry Andric static_assert(!is_void_v<_Tp>); 15790b57cec5SDimitry Andric return _VSTD::get<__find_exactly_one_t<_Tp, _Types...>::value>(__v); 15800b57cec5SDimitry Andric} 15810b57cec5SDimitry Andric 15820b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 1583*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 15840b57cec5SDimitry Andric_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS 15850b57cec5SDimitry Andricconstexpr const _Tp&& get(const variant<_Types...>&& __v) { 15860b57cec5SDimitry Andric static_assert(!is_void_v<_Tp>); 15870b57cec5SDimitry Andric return _VSTD::get<__find_exactly_one_t<_Tp, _Types...>::value>( 15880b57cec5SDimitry Andric _VSTD::move(__v)); 15890b57cec5SDimitry Andric} 15900b57cec5SDimitry Andric 15910b57cec5SDimitry Andrictemplate <size_t _Ip, class _Vp> 1592*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 15930b57cec5SDimitry Andricconstexpr auto* __generic_get_if(_Vp* __v) noexcept { 15940b57cec5SDimitry Andric using __variant_detail::__access::__variant; 1595*bdd1243dSDimitry Andric return __v && std::__holds_alternative<_Ip>(*__v) 15960b57cec5SDimitry Andric ? _VSTD::addressof(__variant::__get_alt<_Ip>(*__v).__value) 15970b57cec5SDimitry Andric : nullptr; 15980b57cec5SDimitry Andric} 15990b57cec5SDimitry Andric 16000b57cec5SDimitry Andrictemplate <size_t _Ip, class... _Types> 1601*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 16020b57cec5SDimitry Andricconstexpr add_pointer_t<variant_alternative_t<_Ip, variant<_Types...>>> 16030b57cec5SDimitry Andricget_if(variant<_Types...>* __v) noexcept { 16040b57cec5SDimitry Andric static_assert(_Ip < sizeof...(_Types)); 16050b57cec5SDimitry Andric static_assert(!is_void_v<variant_alternative_t<_Ip, variant<_Types...>>>); 1606*bdd1243dSDimitry Andric return std::__generic_get_if<_Ip>(__v); 16070b57cec5SDimitry Andric} 16080b57cec5SDimitry Andric 16090b57cec5SDimitry Andrictemplate <size_t _Ip, class... _Types> 1610*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 16110b57cec5SDimitry Andricconstexpr add_pointer_t<const variant_alternative_t<_Ip, variant<_Types...>>> 16120b57cec5SDimitry Andricget_if(const variant<_Types...>* __v) noexcept { 16130b57cec5SDimitry Andric static_assert(_Ip < sizeof...(_Types)); 16140b57cec5SDimitry Andric static_assert(!is_void_v<variant_alternative_t<_Ip, variant<_Types...>>>); 1615*bdd1243dSDimitry Andric return std::__generic_get_if<_Ip>(__v); 16160b57cec5SDimitry Andric} 16170b57cec5SDimitry Andric 16180b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 1619*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 16200b57cec5SDimitry Andricconstexpr add_pointer_t<_Tp> 16210b57cec5SDimitry Andricget_if(variant<_Types...>* __v) noexcept { 16220b57cec5SDimitry Andric static_assert(!is_void_v<_Tp>); 16230b57cec5SDimitry Andric return _VSTD::get_if<__find_exactly_one_t<_Tp, _Types...>::value>(__v); 16240b57cec5SDimitry Andric} 16250b57cec5SDimitry Andric 16260b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 1627*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 16280b57cec5SDimitry Andricconstexpr add_pointer_t<const _Tp> 16290b57cec5SDimitry Andricget_if(const variant<_Types...>* __v) noexcept { 16300b57cec5SDimitry Andric static_assert(!is_void_v<_Tp>); 16310b57cec5SDimitry Andric return _VSTD::get_if<__find_exactly_one_t<_Tp, _Types...>::value>(__v); 16320b57cec5SDimitry Andric} 16330b57cec5SDimitry Andric 16340b57cec5SDimitry Andrictemplate <class _Operator> 16350b57cec5SDimitry Andricstruct __convert_to_bool { 16360b57cec5SDimitry Andric template <class _T1, class _T2> 1637*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 1638*bdd1243dSDimitry Andric constexpr bool operator()(_T1 && __t1, _T2&& __t2) const { 1639e8d8bef9SDimitry Andric static_assert(is_convertible<decltype(_Operator{}(_VSTD::forward<_T1>(__t1), _VSTD::forward<_T2>(__t2))), bool>::value, 16400b57cec5SDimitry Andric "the relational operator does not return a type which is implicitly convertible to bool"); 16410b57cec5SDimitry Andric return _Operator{}(_VSTD::forward<_T1>(__t1), _VSTD::forward<_T2>(__t2)); 16420b57cec5SDimitry Andric } 16430b57cec5SDimitry Andric}; 16440b57cec5SDimitry Andric 16450b57cec5SDimitry Andrictemplate <class... _Types> 1646*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 16470b57cec5SDimitry Andricconstexpr bool operator==(const variant<_Types...>& __lhs, 16480b57cec5SDimitry Andric const variant<_Types...>& __rhs) { 16490b57cec5SDimitry Andric using __variant_detail::__visitation::__variant; 16500b57cec5SDimitry Andric if (__lhs.index() != __rhs.index()) return false; 16510b57cec5SDimitry Andric if (__lhs.valueless_by_exception()) return true; 16520b57cec5SDimitry Andric return __variant::__visit_value_at(__lhs.index(), __convert_to_bool<equal_to<>>{}, __lhs, __rhs); 16530b57cec5SDimitry Andric} 16540b57cec5SDimitry Andric 1655*bdd1243dSDimitry Andric# if _LIBCPP_STD_VER > 17 1656*bdd1243dSDimitry Andric 1657*bdd1243dSDimitry Andrictemplate <class... _Types> requires (three_way_comparable<_Types> && ...) 1658*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr common_comparison_category_t<compare_three_way_result_t<_Types>...> 1659*bdd1243dSDimitry Andricoperator<=>(const variant<_Types...>& __lhs, const variant<_Types...>& __rhs) { 1660*bdd1243dSDimitry Andric using __variant_detail::__visitation::__variant; 1661*bdd1243dSDimitry Andric using __result_t = common_comparison_category_t<compare_three_way_result_t<_Types>...>; 1662*bdd1243dSDimitry Andric if (__lhs.valueless_by_exception() && __rhs.valueless_by_exception()) 1663*bdd1243dSDimitry Andric return strong_ordering::equal; 1664*bdd1243dSDimitry Andric if (__lhs.valueless_by_exception()) 1665*bdd1243dSDimitry Andric return strong_ordering::less; 1666*bdd1243dSDimitry Andric if (__rhs.valueless_by_exception()) 1667*bdd1243dSDimitry Andric return strong_ordering::greater; 1668*bdd1243dSDimitry Andric if (auto __c = __lhs.index() <=> __rhs.index(); __c != 0) 1669*bdd1243dSDimitry Andric return __c; 1670*bdd1243dSDimitry Andric auto __three_way = []<class _Type>(const _Type& __v, const _Type& __w) -> __result_t { return __v <=> __w; }; 1671*bdd1243dSDimitry Andric return __variant::__visit_value_at(__lhs.index(), __three_way, __lhs, __rhs); 1672*bdd1243dSDimitry Andric} 1673*bdd1243dSDimitry Andric 1674*bdd1243dSDimitry Andric# endif // _LIBCPP_STD_VER > 17 1675*bdd1243dSDimitry Andric 16760b57cec5SDimitry Andrictemplate <class... _Types> 1677*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 16780b57cec5SDimitry Andricconstexpr bool operator!=(const variant<_Types...>& __lhs, 16790b57cec5SDimitry Andric const variant<_Types...>& __rhs) { 16800b57cec5SDimitry Andric using __variant_detail::__visitation::__variant; 16810b57cec5SDimitry Andric if (__lhs.index() != __rhs.index()) return true; 16820b57cec5SDimitry Andric if (__lhs.valueless_by_exception()) return false; 16830b57cec5SDimitry Andric return __variant::__visit_value_at( 16840b57cec5SDimitry Andric __lhs.index(), __convert_to_bool<not_equal_to<>>{}, __lhs, __rhs); 16850b57cec5SDimitry Andric} 16860b57cec5SDimitry Andric 16870b57cec5SDimitry Andrictemplate <class... _Types> 1688*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 16890b57cec5SDimitry Andricconstexpr bool operator<(const variant<_Types...>& __lhs, 16900b57cec5SDimitry Andric const variant<_Types...>& __rhs) { 16910b57cec5SDimitry Andric using __variant_detail::__visitation::__variant; 16920b57cec5SDimitry Andric if (__rhs.valueless_by_exception()) return false; 16930b57cec5SDimitry Andric if (__lhs.valueless_by_exception()) return true; 16940b57cec5SDimitry Andric if (__lhs.index() < __rhs.index()) return true; 16950b57cec5SDimitry Andric if (__lhs.index() > __rhs.index()) return false; 16960b57cec5SDimitry Andric return __variant::__visit_value_at(__lhs.index(), __convert_to_bool<less<>>{}, __lhs, __rhs); 16970b57cec5SDimitry Andric} 16980b57cec5SDimitry Andric 16990b57cec5SDimitry Andrictemplate <class... _Types> 1700*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 17010b57cec5SDimitry Andricconstexpr bool operator>(const variant<_Types...>& __lhs, 17020b57cec5SDimitry Andric const variant<_Types...>& __rhs) { 17030b57cec5SDimitry Andric using __variant_detail::__visitation::__variant; 17040b57cec5SDimitry Andric if (__lhs.valueless_by_exception()) return false; 17050b57cec5SDimitry Andric if (__rhs.valueless_by_exception()) return true; 17060b57cec5SDimitry Andric if (__lhs.index() > __rhs.index()) return true; 17070b57cec5SDimitry Andric if (__lhs.index() < __rhs.index()) return false; 17080b57cec5SDimitry Andric return __variant::__visit_value_at(__lhs.index(), __convert_to_bool<greater<>>{}, __lhs, __rhs); 17090b57cec5SDimitry Andric} 17100b57cec5SDimitry Andric 17110b57cec5SDimitry Andrictemplate <class... _Types> 1712*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 17130b57cec5SDimitry Andricconstexpr bool operator<=(const variant<_Types...>& __lhs, 17140b57cec5SDimitry Andric const variant<_Types...>& __rhs) { 17150b57cec5SDimitry Andric using __variant_detail::__visitation::__variant; 17160b57cec5SDimitry Andric if (__lhs.valueless_by_exception()) return true; 17170b57cec5SDimitry Andric if (__rhs.valueless_by_exception()) return false; 17180b57cec5SDimitry Andric if (__lhs.index() < __rhs.index()) return true; 17190b57cec5SDimitry Andric if (__lhs.index() > __rhs.index()) return false; 17200b57cec5SDimitry Andric return __variant::__visit_value_at( 17210b57cec5SDimitry Andric __lhs.index(), __convert_to_bool<less_equal<>>{}, __lhs, __rhs); 17220b57cec5SDimitry Andric} 17230b57cec5SDimitry Andric 17240b57cec5SDimitry Andrictemplate <class... _Types> 1725*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 17260b57cec5SDimitry Andricconstexpr bool operator>=(const variant<_Types...>& __lhs, 17270b57cec5SDimitry Andric const variant<_Types...>& __rhs) { 17280b57cec5SDimitry Andric using __variant_detail::__visitation::__variant; 17290b57cec5SDimitry Andric if (__rhs.valueless_by_exception()) return true; 17300b57cec5SDimitry Andric if (__lhs.valueless_by_exception()) return false; 17310b57cec5SDimitry Andric if (__lhs.index() > __rhs.index()) return true; 17320b57cec5SDimitry Andric if (__lhs.index() < __rhs.index()) return false; 17330b57cec5SDimitry Andric return __variant::__visit_value_at( 17340b57cec5SDimitry Andric __lhs.index(), __convert_to_bool<greater_equal<>>{}, __lhs, __rhs); 17350b57cec5SDimitry Andric} 17360b57cec5SDimitry Andric 1737e8d8bef9SDimitry Andrictemplate <class... _Vs> 1738*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 1739*bdd1243dSDimitry Andric_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS 1740*bdd1243dSDimitry Andricconstexpr void __throw_if_valueless(_Vs&&... __vs) { 1741fe6060f1SDimitry Andric const bool __valueless = 1742fe6060f1SDimitry Andric (... || _VSTD::__as_variant(__vs).valueless_by_exception()); 1743e8d8bef9SDimitry Andric if (__valueless) { 1744e8d8bef9SDimitry Andric __throw_bad_variant_access(); 1745e8d8bef9SDimitry Andric } 1746e8d8bef9SDimitry Andric} 1747e8d8bef9SDimitry Andric 1748fe6060f1SDimitry Andrictemplate < 1749fe6060f1SDimitry Andric class _Visitor, class... _Vs, 1750*bdd1243dSDimitry Andric typename = void_t<decltype(_VSTD::__as_variant(std::declval<_Vs>()))...> > 1751*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 1752*bdd1243dSDimitry Andric_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS 1753*bdd1243dSDimitry Andricconstexpr decltype(auto) visit(_Visitor&& __visitor, _Vs&&... __vs) { 17540b57cec5SDimitry Andric using __variant_detail::__visitation::__variant; 1755e8d8bef9SDimitry Andric _VSTD::__throw_if_valueless(_VSTD::forward<_Vs>(__vs)...); 17560b57cec5SDimitry Andric return __variant::__visit_value(_VSTD::forward<_Visitor>(__visitor), 17570b57cec5SDimitry Andric _VSTD::forward<_Vs>(__vs)...); 17580b57cec5SDimitry Andric} 17590b57cec5SDimitry Andric 1760e8d8bef9SDimitry Andric#if _LIBCPP_STD_VER > 17 1761fe6060f1SDimitry Andrictemplate < 1762fe6060f1SDimitry Andric class _Rp, class _Visitor, class... _Vs, 1763*bdd1243dSDimitry Andric typename = void_t<decltype(_VSTD::__as_variant(std::declval<_Vs>()))...> > 1764*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 1765*bdd1243dSDimitry Andric_LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS 1766*bdd1243dSDimitry Andricconstexpr _Rp visit(_Visitor&& __visitor, _Vs&&... __vs) { 1767e8d8bef9SDimitry Andric using __variant_detail::__visitation::__variant; 1768e8d8bef9SDimitry Andric _VSTD::__throw_if_valueless(_VSTD::forward<_Vs>(__vs)...); 1769e8d8bef9SDimitry Andric return __variant::__visit_value<_Rp>(_VSTD::forward<_Visitor>(__visitor), 1770e8d8bef9SDimitry Andric _VSTD::forward<_Vs>(__vs)...); 1771e8d8bef9SDimitry Andric} 1772e8d8bef9SDimitry Andric#endif 1773e8d8bef9SDimitry Andric 17740b57cec5SDimitry Andrictemplate <class... _Types> 1775*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 1776349cc55cSDimitry Andricauto swap(variant<_Types...>& __lhs, variant<_Types...>& __rhs) 1777349cc55cSDimitry Andric noexcept(noexcept(__lhs.swap(__rhs))) 1778349cc55cSDimitry Andric -> decltype( __lhs.swap(__rhs)) 1779349cc55cSDimitry Andric { return __lhs.swap(__rhs); } 17800b57cec5SDimitry Andric 17810b57cec5SDimitry Andrictemplate <class... _Types> 17820b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS hash< 17830b57cec5SDimitry Andric __enable_hash_helper<variant<_Types...>, remove_const_t<_Types>...>> { 17840b57cec5SDimitry Andric using argument_type = variant<_Types...>; 17850b57cec5SDimitry Andric using result_type = size_t; 17860b57cec5SDimitry Andric 1787*bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI 17880b57cec5SDimitry Andric result_type operator()(const argument_type& __v) const { 17890b57cec5SDimitry Andric using __variant_detail::__visitation::__variant; 17900b57cec5SDimitry Andric size_t __res = 17910b57cec5SDimitry Andric __v.valueless_by_exception() 17920b57cec5SDimitry Andric ? 299792458 // Random value chosen by the universe upon creation 17930b57cec5SDimitry Andric : __variant::__visit_alt( 17940b57cec5SDimitry Andric [](const auto& __alt) { 1795*bdd1243dSDimitry Andric using __alt_type = __remove_cvref_t<decltype(__alt)>; 17960b57cec5SDimitry Andric using __value_type = remove_const_t< 17970b57cec5SDimitry Andric typename __alt_type::__value_type>; 17980b57cec5SDimitry Andric return hash<__value_type>{}(__alt.__value); 17990b57cec5SDimitry Andric }, 18000b57cec5SDimitry Andric __v); 1801*bdd1243dSDimitry Andric return std::__hash_combine(__res, hash<size_t>{}(__v.index())); 18020b57cec5SDimitry Andric } 18030b57cec5SDimitry Andric}; 18040b57cec5SDimitry Andric 1805fe6060f1SDimitry Andric// __unchecked_get is the same as std::get, except, it is UB to use it with the wrong 1806fe6060f1SDimitry Andric// type whereas std::get will throw or returning nullptr. This makes it faster than 1807fe6060f1SDimitry Andric// std::get. 1808fe6060f1SDimitry Andrictemplate <size_t _Ip, class _Vp> 1809*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 1810fe6060f1SDimitry Andricconstexpr auto&& __unchecked_get(_Vp&& __v) noexcept { 1811fe6060f1SDimitry Andric using __variant_detail::__access::__variant; 1812fe6060f1SDimitry Andric return __variant::__get_alt<_Ip>(_VSTD::forward<_Vp>(__v)).__value; 18130b57cec5SDimitry Andric} 1814fe6060f1SDimitry Andric 1815fe6060f1SDimitry Andrictemplate <class _Tp, class... _Types> 1816*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 1817fe6060f1SDimitry Andricconstexpr auto&& __unchecked_get(const variant<_Types...>& __v) noexcept { 1818*bdd1243dSDimitry Andric return std::__unchecked_get<__find_exactly_one_t<_Tp, _Types...>::value>(__v); 1819fe6060f1SDimitry Andric} 1820fe6060f1SDimitry Andric 1821fe6060f1SDimitry Andrictemplate <class _Tp, class... _Types> 1822*bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 1823fe6060f1SDimitry Andricconstexpr auto&& __unchecked_get(variant<_Types...>& __v) noexcept { 1824*bdd1243dSDimitry Andric return std::__unchecked_get<__find_exactly_one_t<_Tp, _Types...>::value>(__v); 1825fe6060f1SDimitry Andric} 18260b57cec5SDimitry Andric 18270b57cec5SDimitry Andric#endif // _LIBCPP_STD_VER > 14 18280b57cec5SDimitry Andric 18290b57cec5SDimitry Andric_LIBCPP_END_NAMESPACE_STD 18300b57cec5SDimitry Andric 18310b57cec5SDimitry Andric_LIBCPP_POP_MACROS 18320b57cec5SDimitry Andric 1833*bdd1243dSDimitry Andric#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 1834*bdd1243dSDimitry Andric# include <type_traits> 1835*bdd1243dSDimitry Andric# include <typeinfo> 1836*bdd1243dSDimitry Andric# include <utility> 1837*bdd1243dSDimitry Andric#endif 1838*bdd1243dSDimitry Andric 18390b57cec5SDimitry Andric#endif // _LIBCPP_VARIANT 1840