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); 25bdd1243dSDimitry Andric constexpr variant(const variant&); 26bdd1243dSDimitry 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 48bdd1243dSDimitry Andric constexpr variant& operator=(const variant&); 49bdd1243dSDimitry 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); 727a6dacacSDimitry Andric 737a6dacacSDimitry Andric // [variant.visit], visitation 747a6dacacSDimitry Andric template<class Self, class Visitor> 757a6dacacSDimitry Andric constexpr decltype(auto) visit(this Self&&, Visitor&&); // Since C++26 767a6dacacSDimitry Andric template<class R, class Self, class Visitor> 777a6dacacSDimitry Andric constexpr R visit(this Self&&, Visitor&&); // Since C++26 780b57cec5SDimitry Andric }; 790b57cec5SDimitry Andric 800b57cec5SDimitry Andric // 20.7.3, variant helper classes 810b57cec5SDimitry Andric template <class T> struct variant_size; // undefined 820b57cec5SDimitry Andric 830b57cec5SDimitry Andric template <class T> 840b57cec5SDimitry Andric inline constexpr size_t variant_size_v = variant_size<T>::value; 850b57cec5SDimitry Andric 860b57cec5SDimitry Andric template <class T> struct variant_size<const T>; 870b57cec5SDimitry Andric template <class T> struct variant_size<volatile T>; 880b57cec5SDimitry Andric template <class T> struct variant_size<const volatile T>; 890b57cec5SDimitry Andric 900b57cec5SDimitry Andric template <class... Types> 910b57cec5SDimitry Andric struct variant_size<variant<Types...>>; 920b57cec5SDimitry Andric 930b57cec5SDimitry Andric template <size_t I, class T> struct variant_alternative; // undefined 940b57cec5SDimitry Andric 950b57cec5SDimitry Andric template <size_t I, class T> 960b57cec5SDimitry Andric using variant_alternative_t = typename variant_alternative<I, T>::type; 970b57cec5SDimitry Andric 980b57cec5SDimitry Andric template <size_t I, class T> struct variant_alternative<I, const T>; 990b57cec5SDimitry Andric template <size_t I, class T> struct variant_alternative<I, volatile T>; 1000b57cec5SDimitry Andric template <size_t I, class T> struct variant_alternative<I, const volatile T>; 1010b57cec5SDimitry Andric 1020b57cec5SDimitry Andric template <size_t I, class... Types> 1030b57cec5SDimitry Andric struct variant_alternative<I, variant<Types...>>; 1040b57cec5SDimitry Andric 1050b57cec5SDimitry Andric inline constexpr size_t variant_npos = -1; 1060b57cec5SDimitry Andric 1070b57cec5SDimitry Andric // 20.7.4, value access 1080b57cec5SDimitry Andric template <class T, class... Types> 1090b57cec5SDimitry Andric constexpr bool holds_alternative(const variant<Types...>&) noexcept; 1100b57cec5SDimitry Andric 1110b57cec5SDimitry Andric template <size_t I, class... Types> 1120b57cec5SDimitry Andric constexpr variant_alternative_t<I, variant<Types...>>& 1130b57cec5SDimitry Andric get(variant<Types...>&); 1140b57cec5SDimitry Andric 1150b57cec5SDimitry Andric template <size_t I, class... Types> 1160b57cec5SDimitry Andric constexpr variant_alternative_t<I, variant<Types...>>&& 1170b57cec5SDimitry Andric get(variant<Types...>&&); 1180b57cec5SDimitry Andric 1190b57cec5SDimitry Andric template <size_t I, class... Types> 1200b57cec5SDimitry Andric constexpr variant_alternative_t<I, variant<Types...>> const& 1210b57cec5SDimitry Andric get(const variant<Types...>&); 1220b57cec5SDimitry Andric 1230b57cec5SDimitry Andric template <size_t I, class... Types> 1240b57cec5SDimitry Andric constexpr variant_alternative_t<I, variant<Types...>> const&& 1250b57cec5SDimitry Andric get(const variant<Types...>&&); 1260b57cec5SDimitry Andric 1270b57cec5SDimitry Andric template <class T, class... Types> 1280b57cec5SDimitry Andric constexpr T& get(variant<Types...>&); 1290b57cec5SDimitry Andric 1300b57cec5SDimitry Andric template <class T, class... Types> 1310b57cec5SDimitry Andric constexpr T&& get(variant<Types...>&&); 1320b57cec5SDimitry Andric 1330b57cec5SDimitry Andric template <class T, class... Types> 1340b57cec5SDimitry Andric constexpr const T& get(const variant<Types...>&); 1350b57cec5SDimitry Andric 1360b57cec5SDimitry Andric template <class T, class... Types> 1370b57cec5SDimitry Andric constexpr const T&& get(const variant<Types...>&&); 1380b57cec5SDimitry Andric 1390b57cec5SDimitry Andric template <size_t I, class... Types> 1400b57cec5SDimitry Andric constexpr add_pointer_t<variant_alternative_t<I, variant<Types...>>> 1410b57cec5SDimitry Andric get_if(variant<Types...>*) noexcept; 1420b57cec5SDimitry Andric 1430b57cec5SDimitry Andric template <size_t I, class... Types> 1440b57cec5SDimitry Andric constexpr add_pointer_t<const variant_alternative_t<I, variant<Types...>>> 1450b57cec5SDimitry Andric get_if(const variant<Types...>*) noexcept; 1460b57cec5SDimitry Andric 1470b57cec5SDimitry Andric template <class T, class... Types> 1480b57cec5SDimitry Andric constexpr add_pointer_t<T> 1490b57cec5SDimitry Andric get_if(variant<Types...>*) noexcept; 1500b57cec5SDimitry Andric 1510b57cec5SDimitry Andric template <class T, class... Types> 1520b57cec5SDimitry Andric constexpr add_pointer_t<const T> 1530b57cec5SDimitry Andric get_if(const variant<Types...>*) noexcept; 1540b57cec5SDimitry Andric 1550b57cec5SDimitry Andric // 20.7.5, relational operators 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 1680b57cec5SDimitry Andric template <class... Types> 1690b57cec5SDimitry Andric constexpr bool operator<=(const variant<Types...>&, const variant<Types...>&); 1700b57cec5SDimitry Andric 1710b57cec5SDimitry Andric template <class... Types> 1720b57cec5SDimitry Andric constexpr bool operator>=(const variant<Types...>&, const variant<Types...>&); 1730b57cec5SDimitry Andric 174bdd1243dSDimitry Andric template <class... Types> requires (three_way_comparable<Types> && ...) 175bdd1243dSDimitry Andric constexpr common_comparison_category_t<compare_three_way_result_t<Types>...> 176bdd1243dSDimitry Andric operator<=>(const variant<Types...>&, const variant<Types...>&); // since C++20 177bdd1243dSDimitry Andric 1780b57cec5SDimitry Andric // 20.7.6, visitation 1790b57cec5SDimitry Andric template <class Visitor, class... Variants> 1800b57cec5SDimitry Andric constexpr see below visit(Visitor&&, Variants&&...); 1810b57cec5SDimitry Andric 182e8d8bef9SDimitry Andric template <class R, class Visitor, class... Variants> 183e8d8bef9SDimitry Andric constexpr R visit(Visitor&&, Variants&&...); // since C++20 184e8d8bef9SDimitry Andric 1850b57cec5SDimitry Andric // 20.7.7, class monostate 1860b57cec5SDimitry Andric struct monostate; 1870b57cec5SDimitry Andric 1880b57cec5SDimitry Andric // 20.7.8, monostate relational operators 1890b57cec5SDimitry Andric constexpr bool operator==(monostate, monostate) noexcept; 190bdd1243dSDimitry Andric constexpr bool operator!=(monostate, monostate) noexcept; // until C++20 191bdd1243dSDimitry Andric constexpr bool operator<(monostate, monostate) noexcept; // until C++20 192bdd1243dSDimitry Andric constexpr bool operator>(monostate, monostate) noexcept; // until C++20 193bdd1243dSDimitry Andric constexpr bool operator<=(monostate, monostate) noexcept; // until C++20 194bdd1243dSDimitry Andric constexpr bool operator>=(monostate, monostate) noexcept; // until C++20 195bdd1243dSDimitry Andric constexpr strong_ordering operator<=>(monostate, monostate) noexcept; // since C++20 1960b57cec5SDimitry Andric 1970b57cec5SDimitry Andric // 20.7.9, specialized algorithms 1980b57cec5SDimitry Andric template <class... Types> 1990b57cec5SDimitry Andric void swap(variant<Types...>&, variant<Types...>&) noexcept(see below); 2000b57cec5SDimitry Andric 2010b57cec5SDimitry Andric // 20.7.10, class bad_variant_access 2020b57cec5SDimitry Andric class bad_variant_access; 2030b57cec5SDimitry Andric 2040b57cec5SDimitry Andric // 20.7.11, hash support 2050b57cec5SDimitry Andric template <class T> struct hash; 2060b57cec5SDimitry Andric template <class... Types> struct hash<variant<Types...>>; 2070b57cec5SDimitry Andric template <> struct hash<monostate>; 2080b57cec5SDimitry Andric 2090b57cec5SDimitry Andric} // namespace std 2100b57cec5SDimitry Andric 2110b57cec5SDimitry Andric*/ 2120b57cec5SDimitry Andric 21381ad6265SDimitry Andric#include <__assert> // all public C++ headers provide the assertion handler 214e8d8bef9SDimitry Andric#include <__availability> 215bdd1243dSDimitry Andric#include <__compare/common_comparison_category.h> 216bdd1243dSDimitry Andric#include <__compare/compare_three_way_result.h> 217bdd1243dSDimitry Andric#include <__compare/three_way_comparable.h> 218fe6060f1SDimitry Andric#include <__config> 21906c3fb27SDimitry Andric#include <__exception/exception.h> 220fe6060f1SDimitry Andric#include <__functional/hash.h> 221bdd1243dSDimitry Andric#include <__functional/invoke.h> 22281ad6265SDimitry Andric#include <__functional/operations.h> 22381ad6265SDimitry Andric#include <__functional/unary_function.h> 22406c3fb27SDimitry Andric#include <__memory/addressof.h> 225bdd1243dSDimitry Andric#include <__type_traits/add_const.h> 226bdd1243dSDimitry Andric#include <__type_traits/add_cv.h> 227bdd1243dSDimitry Andric#include <__type_traits/add_pointer.h> 228bdd1243dSDimitry Andric#include <__type_traits/add_volatile.h> 229bdd1243dSDimitry Andric#include <__type_traits/dependent_type.h> 230bdd1243dSDimitry Andric#include <__type_traits/is_array.h> 231bdd1243dSDimitry Andric#include <__type_traits/is_destructible.h> 232bdd1243dSDimitry Andric#include <__type_traits/is_nothrow_move_constructible.h> 233bdd1243dSDimitry Andric#include <__type_traits/is_trivially_copy_assignable.h> 234bdd1243dSDimitry Andric#include <__type_traits/is_trivially_copy_constructible.h> 235bdd1243dSDimitry Andric#include <__type_traits/is_trivially_destructible.h> 236bdd1243dSDimitry Andric#include <__type_traits/is_trivially_move_assignable.h> 237bdd1243dSDimitry Andric#include <__type_traits/is_trivially_move_constructible.h> 238bdd1243dSDimitry Andric#include <__type_traits/is_void.h> 239bdd1243dSDimitry Andric#include <__type_traits/remove_const.h> 240bdd1243dSDimitry Andric#include <__type_traits/type_identity.h> 241bdd1243dSDimitry Andric#include <__type_traits/void_t.h> 24206c3fb27SDimitry Andric#include <__utility/declval.h> 243fe6060f1SDimitry Andric#include <__utility/forward.h> 2447a6dacacSDimitry Andric#include <__utility/forward_like.h> 24581ad6265SDimitry Andric#include <__utility/in_place.h> 24681ad6265SDimitry Andric#include <__utility/move.h> 24781ad6265SDimitry Andric#include <__utility/swap.h> 248fe6060f1SDimitry Andric#include <__variant/monostate.h> 24906c3fb27SDimitry Andric#include <__verbose_abort> 2500b57cec5SDimitry Andric#include <initializer_list> 251fe6060f1SDimitry Andric#include <limits> 2520b57cec5SDimitry Andric#include <new> 2530b57cec5SDimitry Andric#include <tuple> 2540b57cec5SDimitry Andric#include <version> 2550b57cec5SDimitry Andric 25681ad6265SDimitry Andric// standard-mandated includes 257bdd1243dSDimitry Andric 258bdd1243dSDimitry Andric// [variant.syn] 25981ad6265SDimitry Andric#include <compare> 26081ad6265SDimitry Andric 2610b57cec5SDimitry Andric#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 2620b57cec5SDimitry Andric# pragma GCC system_header 2630b57cec5SDimitry Andric#endif 2640b57cec5SDimitry Andric 2650b57cec5SDimitry Andric_LIBCPP_PUSH_MACROS 2660b57cec5SDimitry Andric#include <__undef_macros> 2670b57cec5SDimitry Andric 2680b57cec5SDimitry Andricnamespace std { // explicitly not using versioning namespace 2690b57cec5SDimitry Andric 27006c3fb27SDimitry Andricclass _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS bad_variant_access : public exception { 2710b57cec5SDimitry Andricpublic: 272bdd1243dSDimitry Andric const char* what() const _NOEXCEPT override; 2730b57cec5SDimitry Andric}; 2740b57cec5SDimitry Andric 2750b57cec5SDimitry Andric} // namespace std 2760b57cec5SDimitry Andric 2770b57cec5SDimitry Andric_LIBCPP_BEGIN_NAMESPACE_STD 2780b57cec5SDimitry Andric 27906c3fb27SDimitry Andric#if _LIBCPP_STD_VER >= 17 2800b57cec5SDimitry Andric 281fe6060f1SDimitry Andric// Light N-dimensional array of function pointers. Used in place of std::array to avoid 282fe6060f1SDimitry Andric// adding a dependency. 283fe6060f1SDimitry Andrictemplate <class _Tp, size_t _Size> 284fe6060f1SDimitry Andricstruct __farray { 285fe6060f1SDimitry Andric static_assert(_Size > 0, "N-dimensional array should never be empty in std::visit"); 286fe6060f1SDimitry Andric _Tp __buf_[_Size] = {}; 287fe6060f1SDimitry Andric 288cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr const _Tp& operator[](size_t __n) const noexcept { return __buf_[__n]; } 289fe6060f1SDimitry Andric}; 290fe6060f1SDimitry Andric 291cb14a3feSDimitry Andric_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS void 292cb14a3feSDimitry Andric__throw_bad_variant_access() { 29306c3fb27SDimitry Andric# ifndef _LIBCPP_HAS_NO_EXCEPTIONS 2940b57cec5SDimitry Andric throw bad_variant_access(); 2950b57cec5SDimitry Andric# else 29606c3fb27SDimitry Andric _LIBCPP_VERBOSE_ABORT("bad_variant_access was thrown in -fno-exceptions mode"); 2970b57cec5SDimitry Andric# endif 2980b57cec5SDimitry Andric} 2990b57cec5SDimitry Andric 3000b57cec5SDimitry Andrictemplate <class... _Types> 3010b57cec5SDimitry Andricclass _LIBCPP_TEMPLATE_VIS variant; 3020b57cec5SDimitry Andric 3030b57cec5SDimitry Andrictemplate <class _Tp> 3040b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_size; 3050b57cec5SDimitry Andric 3060b57cec5SDimitry Andrictemplate <class _Tp> 307349cc55cSDimitry Andricinline constexpr size_t variant_size_v = variant_size<_Tp>::value; 3080b57cec5SDimitry Andric 3090b57cec5SDimitry Andrictemplate <class _Tp> 3100b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_size<const _Tp> : variant_size<_Tp> {}; 3110b57cec5SDimitry Andric 3120b57cec5SDimitry Andrictemplate <class _Tp> 3130b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_size<volatile _Tp> : variant_size<_Tp> {}; 3140b57cec5SDimitry Andric 3150b57cec5SDimitry Andrictemplate <class _Tp> 316cb14a3feSDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_size<const volatile _Tp> : variant_size<_Tp> {}; 3170b57cec5SDimitry Andric 3180b57cec5SDimitry Andrictemplate <class... _Types> 319cb14a3feSDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_size<variant<_Types...>> : integral_constant<size_t, sizeof...(_Types)> {}; 3200b57cec5SDimitry Andric 3210b57cec5SDimitry Andrictemplate <size_t _Ip, class _Tp> 3220b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_alternative; 3230b57cec5SDimitry Andric 3240b57cec5SDimitry Andrictemplate <size_t _Ip, class _Tp> 3250b57cec5SDimitry Andricusing variant_alternative_t = typename variant_alternative<_Ip, _Tp>::type; 3260b57cec5SDimitry Andric 3270b57cec5SDimitry Andrictemplate <size_t _Ip, class _Tp> 328cb14a3feSDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_alternative<_Ip, const _Tp> : add_const<variant_alternative_t<_Ip, _Tp>> {}; 3290b57cec5SDimitry Andric 3300b57cec5SDimitry Andrictemplate <size_t _Ip, class _Tp> 331cb14a3feSDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_alternative<_Ip, volatile _Tp> : add_volatile<variant_alternative_t<_Ip, _Tp>> {}; 3320b57cec5SDimitry Andric 3330b57cec5SDimitry Andrictemplate <size_t _Ip, class _Tp> 334cb14a3feSDimitry Andricstruct _LIBCPP_TEMPLATE_VIS variant_alternative<_Ip, const volatile _Tp> : 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 344bdd1243dSDimitry 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 357cb14a3feSDimitry Andric std::tuple_element_t< __choose_index_type(_NumAlts), std::tuple<unsigned char, unsigned short, unsigned int> >; 3580b57cec5SDimitry Andric# endif 3590b57cec5SDimitry Andric 3600b57cec5SDimitry Andrictemplate <class _IndexType> 3610b57cec5SDimitry Andricconstexpr _IndexType __variant_npos = static_cast<_IndexType>(-1); 3620b57cec5SDimitry Andric 363fe6060f1SDimitry Andrictemplate <class... _Types> 364fe6060f1SDimitry Andricclass _LIBCPP_TEMPLATE_VIS variant; 365fe6060f1SDimitry Andric 366fe6060f1SDimitry Andrictemplate <class... _Types> 367cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr variant<_Types...>& __as_variant(variant<_Types...>& __vs) noexcept { 368fe6060f1SDimitry Andric return __vs; 369fe6060f1SDimitry Andric} 370fe6060f1SDimitry Andric 371fe6060f1SDimitry Andrictemplate <class... _Types> 372cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr const variant<_Types...>& __as_variant(const variant<_Types...>& __vs) noexcept { 373fe6060f1SDimitry Andric return __vs; 374fe6060f1SDimitry Andric} 375fe6060f1SDimitry Andric 376fe6060f1SDimitry Andrictemplate <class... _Types> 377cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr variant<_Types...>&& __as_variant(variant<_Types...>&& __vs) noexcept { 3785f757f3fSDimitry Andric return std::move(__vs); 379fe6060f1SDimitry Andric} 380fe6060f1SDimitry Andric 381fe6060f1SDimitry Andrictemplate <class... _Types> 382cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr const variant<_Types...>&& __as_variant(const variant<_Types...>&& __vs) noexcept { 3835f757f3fSDimitry Andric return std::move(__vs); 384fe6060f1SDimitry Andric} 385fe6060f1SDimitry Andric 3860b57cec5SDimitry Andricnamespace __find_detail { 3870b57cec5SDimitry Andric 3880b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 389cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr size_t __find_index() { 3900b57cec5SDimitry Andric constexpr bool __matches[] = {is_same_v<_Tp, _Types>...}; 3910b57cec5SDimitry Andric size_t __result = __not_found; 3920b57cec5SDimitry Andric for (size_t __i = 0; __i < sizeof...(_Types); ++__i) { 3930b57cec5SDimitry Andric if (__matches[__i]) { 3940b57cec5SDimitry Andric if (__result != __not_found) { 3950b57cec5SDimitry Andric return __ambiguous; 3960b57cec5SDimitry Andric } 3970b57cec5SDimitry Andric __result = __i; 3980b57cec5SDimitry Andric } 3990b57cec5SDimitry Andric } 4000b57cec5SDimitry Andric return __result; 4010b57cec5SDimitry Andric} 4020b57cec5SDimitry Andric 4030b57cec5SDimitry Andrictemplate <size_t _Index> 404cb14a3feSDimitry Andricstruct __find_unambiguous_index_sfinae_impl : integral_constant<size_t, _Index> {}; 4050b57cec5SDimitry Andric 4060b57cec5SDimitry Andrictemplate <> 4070b57cec5SDimitry Andricstruct __find_unambiguous_index_sfinae_impl<__not_found> {}; 4080b57cec5SDimitry Andric 4090b57cec5SDimitry Andrictemplate <> 4100b57cec5SDimitry Andricstruct __find_unambiguous_index_sfinae_impl<__ambiguous> {}; 4110b57cec5SDimitry Andric 4120b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 413cb14a3feSDimitry Andricstruct __find_unambiguous_index_sfinae : __find_unambiguous_index_sfinae_impl<__find_index<_Tp, _Types...>()> {}; 4140b57cec5SDimitry Andric 4150b57cec5SDimitry Andric} // namespace __find_detail 4160b57cec5SDimitry Andric 4170b57cec5SDimitry Andricnamespace __variant_detail { 4180b57cec5SDimitry Andric 4190b57cec5SDimitry Andricstruct __valueless_t {}; 4200b57cec5SDimitry Andric 4210b57cec5SDimitry Andricenum class _Trait { _TriviallyAvailable, _Available, _Unavailable }; 4220b57cec5SDimitry Andric 423cb14a3feSDimitry Andrictemplate <typename _Tp, template <typename> class _IsTriviallyAvailable, template <typename> class _IsAvailable> 4240b57cec5SDimitry Andricconstexpr _Trait __trait = 425cb14a3feSDimitry Andric _IsTriviallyAvailable<_Tp>::value ? _Trait::_TriviallyAvailable 426cb14a3feSDimitry Andric : _IsAvailable<_Tp>::value 427cb14a3feSDimitry Andric ? _Trait::_Available 428cb14a3feSDimitry Andric : _Trait::_Unavailable; 4290b57cec5SDimitry Andric 430cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr _Trait __common_trait(initializer_list<_Trait> __traits) { 4310b57cec5SDimitry Andric _Trait __result = _Trait::_TriviallyAvailable; 4320b57cec5SDimitry Andric for (_Trait __t : __traits) { 4330b57cec5SDimitry Andric if (static_cast<int>(__t) > static_cast<int>(__result)) { 4340b57cec5SDimitry Andric __result = __t; 4350b57cec5SDimitry Andric } 4360b57cec5SDimitry Andric } 4370b57cec5SDimitry Andric return __result; 4380b57cec5SDimitry Andric} 4390b57cec5SDimitry Andric 4400b57cec5SDimitry Andrictemplate <typename... _Types> 4410b57cec5SDimitry Andricstruct __traits { 4420b57cec5SDimitry Andric static constexpr _Trait __copy_constructible_trait = 443cb14a3feSDimitry Andric __variant_detail::__common_trait({__trait<_Types, is_trivially_copy_constructible, is_copy_constructible>...}); 4440b57cec5SDimitry Andric 4450b57cec5SDimitry Andric static constexpr _Trait __move_constructible_trait = 446cb14a3feSDimitry Andric __variant_detail::__common_trait({__trait<_Types, is_trivially_move_constructible, is_move_constructible>...}); 4470b57cec5SDimitry Andric 448bdd1243dSDimitry Andric static constexpr _Trait __copy_assignable_trait = __variant_detail::__common_trait( 449cb14a3feSDimitry Andric {__copy_constructible_trait, __trait<_Types, is_trivially_copy_assignable, is_copy_assignable>...}); 4500b57cec5SDimitry Andric 451bdd1243dSDimitry Andric static constexpr _Trait __move_assignable_trait = __variant_detail::__common_trait( 452cb14a3feSDimitry Andric {__move_constructible_trait, __trait<_Types, is_trivially_move_assignable, is_move_assignable>...}); 4530b57cec5SDimitry Andric 454cb14a3feSDimitry Andric static constexpr _Trait __destructible_trait = 455cb14a3feSDimitry Andric __variant_detail::__common_trait({__trait<_Types, is_trivially_destructible, is_destructible>...}); 4560b57cec5SDimitry Andric}; 4570b57cec5SDimitry Andric 4580b57cec5SDimitry Andricnamespace __access { 4590b57cec5SDimitry Andric 4600b57cec5SDimitry Andricstruct __union { 4610b57cec5SDimitry Andric template <class _Vp> 462cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr auto&& __get_alt(_Vp&& __v, in_place_index_t<0>) { 4635f757f3fSDimitry Andric return std::forward<_Vp>(__v).__head; 4640b57cec5SDimitry Andric } 4650b57cec5SDimitry Andric 4660b57cec5SDimitry Andric template <class _Vp, size_t _Ip> 467cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr auto&& __get_alt(_Vp&& __v, in_place_index_t<_Ip>) { 4685f757f3fSDimitry Andric return __get_alt(std::forward<_Vp>(__v).__tail, in_place_index<_Ip - 1>); 4690b57cec5SDimitry Andric } 4700b57cec5SDimitry Andric}; 4710b57cec5SDimitry Andric 4720b57cec5SDimitry Andricstruct __base { 4730b57cec5SDimitry Andric template <size_t _Ip, class _Vp> 474cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr auto&& __get_alt(_Vp&& __v) { 475cb14a3feSDimitry Andric return __union::__get_alt(std::forward<_Vp>(__v).__data, in_place_index<_Ip>); 4760b57cec5SDimitry Andric } 4770b57cec5SDimitry Andric}; 4780b57cec5SDimitry Andric 4790b57cec5SDimitry Andricstruct __variant { 4800b57cec5SDimitry Andric template <size_t _Ip, class _Vp> 481cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr auto&& __get_alt(_Vp&& __v) { 4825f757f3fSDimitry Andric return __base::__get_alt<_Ip>(std::forward<_Vp>(__v).__impl_); 4830b57cec5SDimitry Andric } 4840b57cec5SDimitry Andric}; 4850b57cec5SDimitry Andric 4860b57cec5SDimitry Andric} // namespace __access 4870b57cec5SDimitry Andric 4880b57cec5SDimitry Andricnamespace __visitation { 4890b57cec5SDimitry Andric 4900b57cec5SDimitry Andricstruct __base { 4910b57cec5SDimitry Andric template <class _Visitor, class... _Vs> 492cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr decltype(auto) 4930b57cec5SDimitry Andric __visit_alt_at(size_t __index, _Visitor&& __visitor, _Vs&&... __vs) { 494cb14a3feSDimitry Andric constexpr auto __fdiagonal = __make_fdiagonal<_Visitor&&, decltype(std::forward<_Vs>(__vs).__as_base())...>(); 495cb14a3feSDimitry Andric return __fdiagonal[__index](std::forward<_Visitor>(__visitor), std::forward<_Vs>(__vs).__as_base()...); 4960b57cec5SDimitry Andric } 4970b57cec5SDimitry Andric 4980b57cec5SDimitry Andric template <class _Visitor, class... _Vs> 499cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr decltype(auto) __visit_alt(_Visitor&& __visitor, _Vs&&... __vs) { 500cb14a3feSDimitry Andric constexpr auto __fmatrix = __make_fmatrix<_Visitor&&, decltype(std::forward<_Vs>(__vs).__as_base())...>(); 501cb14a3feSDimitry Andric return __at(__fmatrix, __vs.index()...)(std::forward<_Visitor>(__visitor), std::forward<_Vs>(__vs).__as_base()...); 5020b57cec5SDimitry Andric } 5030b57cec5SDimitry Andric 5040b57cec5SDimitry Andricprivate: 5050b57cec5SDimitry Andric template <class _Tp> 506cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr const _Tp& __at(const _Tp& __elem) { 507cb14a3feSDimitry Andric return __elem; 508cb14a3feSDimitry Andric } 5090b57cec5SDimitry Andric 5100b57cec5SDimitry Andric template <class _Tp, size_t _Np, typename... _Indices> 511cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr auto&& 512cb14a3feSDimitry Andric __at(const __farray<_Tp, _Np>& __elems, size_t __index, _Indices... __indices) { 5130b57cec5SDimitry Andric return __at(__elems[__index], __indices...); 5140b57cec5SDimitry Andric } 5150b57cec5SDimitry Andric 5160b57cec5SDimitry Andric template <class _Fp, class... _Fs> 51706c3fb27SDimitry Andric static _LIBCPP_HIDE_FROM_ABI constexpr void __std_visit_visitor_return_type_check() { 5180b57cec5SDimitry Andric static_assert( 519cb14a3feSDimitry Andric __all<is_same_v<_Fp, _Fs>...>::value, "`std::visit` requires the visitor to have a single return type."); 5200b57cec5SDimitry Andric } 5210b57cec5SDimitry Andric 5220b57cec5SDimitry Andric template <class... _Fs> 523cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr auto __make_farray(_Fs&&... __fs) { 524bdd1243dSDimitry Andric __std_visit_visitor_return_type_check<__remove_cvref_t<_Fs>...>(); 525bdd1243dSDimitry Andric using __result = __farray<common_type_t<__remove_cvref_t<_Fs>...>, sizeof...(_Fs)>; 5265f757f3fSDimitry Andric return __result{{std::forward<_Fs>(__fs)...}}; 5270b57cec5SDimitry Andric } 5280b57cec5SDimitry Andric 529e8d8bef9SDimitry Andric template <size_t... _Is> 5300b57cec5SDimitry Andric struct __dispatcher { 5310b57cec5SDimitry Andric template <class _Fp, class... _Vs> 532cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr decltype(auto) __dispatch(_Fp __f, _Vs... __vs) { 533cb14a3feSDimitry Andric return std::__invoke(static_cast<_Fp>(__f), __access::__base::__get_alt<_Is>(static_cast<_Vs>(__vs))...); 5340b57cec5SDimitry Andric } 5350b57cec5SDimitry Andric }; 5360b57cec5SDimitry Andric 5370b57cec5SDimitry Andric template <class _Fp, class... _Vs, size_t... _Is> 538cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr auto __make_dispatch(index_sequence<_Is...>) { 5390b57cec5SDimitry Andric return __dispatcher<_Is...>::template __dispatch<_Fp, _Vs...>; 5400b57cec5SDimitry Andric } 5410b57cec5SDimitry Andric 5420b57cec5SDimitry Andric template <size_t _Ip, class _Fp, class... _Vs> 543cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr auto __make_fdiagonal_impl() { 544cb14a3feSDimitry Andric return __make_dispatch<_Fp, _Vs...>(index_sequence<((void)__type_identity<_Vs>{}, _Ip)...>{}); 5450b57cec5SDimitry Andric } 5460b57cec5SDimitry Andric 5470b57cec5SDimitry Andric template <class _Fp, class... _Vs, size_t... _Is> 548cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr auto __make_fdiagonal_impl(index_sequence<_Is...>) { 5490b57cec5SDimitry Andric return __base::__make_farray(__make_fdiagonal_impl<_Is, _Fp, _Vs...>()...); 5500b57cec5SDimitry Andric } 5510b57cec5SDimitry Andric 5520b57cec5SDimitry Andric template <class _Fp, class _Vp, class... _Vs> 553cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr auto __make_fdiagonal() { 55406c3fb27SDimitry Andric constexpr size_t __np = __remove_cvref_t<_Vp>::__size(); 55506c3fb27SDimitry Andric static_assert(__all<(__np == __remove_cvref_t<_Vs>::__size())...>::value); 55606c3fb27SDimitry Andric return __make_fdiagonal_impl<_Fp, _Vp, _Vs...>(make_index_sequence<__np>{}); 5570b57cec5SDimitry Andric } 5580b57cec5SDimitry Andric 5590b57cec5SDimitry Andric template <class _Fp, class... _Vs, size_t... _Is> 560cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr auto __make_fmatrix_impl(index_sequence<_Is...> __is) { 5610b57cec5SDimitry Andric return __make_dispatch<_Fp, _Vs...>(__is); 5620b57cec5SDimitry Andric } 5630b57cec5SDimitry Andric 5640b57cec5SDimitry Andric template <class _Fp, class... _Vs, size_t... _Is, size_t... _Js, class... _Ls> 565cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr auto 566cb14a3feSDimitry Andric __make_fmatrix_impl(index_sequence<_Is...>, index_sequence<_Js...>, _Ls... __ls) { 567cb14a3feSDimitry Andric return __base::__make_farray(__make_fmatrix_impl<_Fp, _Vs...>(index_sequence<_Is..., _Js>{}, __ls...)...); 5680b57cec5SDimitry Andric } 5690b57cec5SDimitry Andric 5700b57cec5SDimitry Andric template <class _Fp, class... _Vs> 571cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr auto __make_fmatrix() { 5720b57cec5SDimitry Andric return __make_fmatrix_impl<_Fp, _Vs...>( 573bdd1243dSDimitry Andric index_sequence<>{}, make_index_sequence<__remove_cvref_t<_Vs>::__size()>{}...); 5740b57cec5SDimitry Andric } 5750b57cec5SDimitry Andric}; 5760b57cec5SDimitry Andric 5770b57cec5SDimitry Andricstruct __variant { 5780b57cec5SDimitry Andric template <class _Visitor, class... _Vs> 579cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr decltype(auto) 5800b57cec5SDimitry Andric __visit_alt_at(size_t __index, _Visitor&& __visitor, _Vs&&... __vs) { 581cb14a3feSDimitry Andric return __base::__visit_alt_at(__index, std::forward<_Visitor>(__visitor), std::forward<_Vs>(__vs).__impl_...); 5820b57cec5SDimitry Andric } 5830b57cec5SDimitry Andric 5840b57cec5SDimitry Andric template <class _Visitor, class... _Vs> 585cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr decltype(auto) __visit_alt(_Visitor&& __visitor, _Vs&&... __vs) { 586fe6060f1SDimitry Andric return __base::__visit_alt( 587cb14a3feSDimitry Andric std::forward<_Visitor>(__visitor), std::__as_variant(std::forward<_Vs>(__vs)).__impl_...); 5880b57cec5SDimitry Andric } 5890b57cec5SDimitry Andric 5900b57cec5SDimitry Andric template <class _Visitor, class... _Vs> 591cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr decltype(auto) 5920b57cec5SDimitry Andric __visit_value_at(size_t __index, _Visitor&& __visitor, _Vs&&... __vs) { 593cb14a3feSDimitry Andric return __visit_alt_at(__index, __make_value_visitor(std::forward<_Visitor>(__visitor)), std::forward<_Vs>(__vs)...); 5940b57cec5SDimitry Andric } 5950b57cec5SDimitry Andric 5960b57cec5SDimitry Andric template <class _Visitor, class... _Vs> 597cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr decltype(auto) __visit_value(_Visitor&& __visitor, _Vs&&... __vs) { 598cb14a3feSDimitry Andric return __visit_alt(__make_value_visitor(std::forward<_Visitor>(__visitor)), std::forward<_Vs>(__vs)...); 5990b57cec5SDimitry Andric } 600fe6060f1SDimitry Andric 60106c3fb27SDimitry Andric# if _LIBCPP_STD_VER >= 20 602e8d8bef9SDimitry Andric template <class _Rp, class _Visitor, class... _Vs> 603cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr _Rp __visit_value(_Visitor&& __visitor, _Vs&&... __vs) { 604cb14a3feSDimitry Andric return __visit_alt(__make_value_visitor<_Rp>(std::forward<_Visitor>(__visitor)), std::forward<_Vs>(__vs)...); 605e8d8bef9SDimitry Andric } 606e8d8bef9SDimitry Andric# endif 6070b57cec5SDimitry Andric 6080b57cec5SDimitry Andricprivate: 6090b57cec5SDimitry Andric template <class _Visitor, class... _Values> 61006c3fb27SDimitry Andric static _LIBCPP_HIDE_FROM_ABI constexpr void __std_visit_exhaustive_visitor_check() { 611cb14a3feSDimitry Andric static_assert(is_invocable_v<_Visitor, _Values...>, "`std::visit` requires the visitor to be exhaustive."); 6120b57cec5SDimitry Andric } 6130b57cec5SDimitry Andric 6140b57cec5SDimitry Andric template <class _Visitor> 6150b57cec5SDimitry Andric struct __value_visitor { 6160b57cec5SDimitry Andric template <class... _Alts> 617cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) operator()(_Alts&&... __alts) const { 618cb14a3feSDimitry Andric __std_visit_exhaustive_visitor_check< _Visitor, decltype((std::forward<_Alts>(__alts).__value))...>(); 619cb14a3feSDimitry Andric return std::__invoke(std::forward<_Visitor>(__visitor), std::forward<_Alts>(__alts).__value...); 6200b57cec5SDimitry Andric } 6210b57cec5SDimitry Andric _Visitor&& __visitor; 6220b57cec5SDimitry Andric }; 6230b57cec5SDimitry Andric 62406c3fb27SDimitry Andric# if _LIBCPP_STD_VER >= 20 625e8d8bef9SDimitry Andric template <class _Rp, class _Visitor> 626e8d8bef9SDimitry Andric struct __value_visitor_return_type { 627e8d8bef9SDimitry Andric template <class... _Alts> 628cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr _Rp operator()(_Alts&&... __alts) const { 629cb14a3feSDimitry Andric __std_visit_exhaustive_visitor_check< _Visitor, decltype((std::forward<_Alts>(__alts).__value))...>(); 630e8d8bef9SDimitry Andric if constexpr (is_void_v<_Rp>) { 631cb14a3feSDimitry Andric std::__invoke(std::forward<_Visitor>(__visitor), std::forward<_Alts>(__alts).__value...); 632cb14a3feSDimitry Andric } else { 633cb14a3feSDimitry Andric return std::__invoke(std::forward<_Visitor>(__visitor), std::forward<_Alts>(__alts).__value...); 634e8d8bef9SDimitry Andric } 635e8d8bef9SDimitry Andric } 636e8d8bef9SDimitry Andric 637e8d8bef9SDimitry Andric _Visitor&& __visitor; 638e8d8bef9SDimitry Andric }; 639e8d8bef9SDimitry Andric# endif 640e8d8bef9SDimitry Andric 6410b57cec5SDimitry Andric template <class _Visitor> 642cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr auto __make_value_visitor(_Visitor&& __visitor) { 6435f757f3fSDimitry Andric return __value_visitor<_Visitor>{std::forward<_Visitor>(__visitor)}; 6440b57cec5SDimitry Andric } 645e8d8bef9SDimitry Andric 64606c3fb27SDimitry Andric# if _LIBCPP_STD_VER >= 20 647e8d8bef9SDimitry Andric template <class _Rp, class _Visitor> 648cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr auto __make_value_visitor(_Visitor&& __visitor) { 6495f757f3fSDimitry Andric return __value_visitor_return_type<_Rp, _Visitor>{std::forward<_Visitor>(__visitor)}; 650e8d8bef9SDimitry Andric } 651e8d8bef9SDimitry Andric# endif 6520b57cec5SDimitry Andric}; 6530b57cec5SDimitry Andric 6540b57cec5SDimitry Andric} // namespace __visitation 6550b57cec5SDimitry Andric 6560b57cec5SDimitry Andrictemplate <size_t _Index, class _Tp> 6570b57cec5SDimitry Andricstruct _LIBCPP_TEMPLATE_VIS __alt { 6580b57cec5SDimitry Andric using __value_type = _Tp; 6590b57cec5SDimitry Andric 6600b57cec5SDimitry Andric template <class... _Args> 661cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI explicit constexpr __alt(in_place_t, _Args&&... __args) 6625f757f3fSDimitry Andric : __value(std::forward<_Args>(__args)...) {} 6630b57cec5SDimitry Andric 6640b57cec5SDimitry Andric __value_type __value; 6650b57cec5SDimitry Andric}; 6660b57cec5SDimitry Andric 6670b57cec5SDimitry Andrictemplate <_Trait _DestructibleTrait, size_t _Index, class... _Types> 6680b57cec5SDimitry Andricunion _LIBCPP_TEMPLATE_VIS __union; 6690b57cec5SDimitry Andric 6700b57cec5SDimitry Andrictemplate <_Trait _DestructibleTrait, size_t _Index> 6710b57cec5SDimitry Andricunion _LIBCPP_TEMPLATE_VIS __union<_DestructibleTrait, _Index> {}; 6720b57cec5SDimitry Andric 6730b57cec5SDimitry Andric# define _LIBCPP_VARIANT_UNION(destructible_trait, destructor) \ 6740b57cec5SDimitry Andric template <size_t _Index, class _Tp, class... _Types> \ 675cb14a3feSDimitry Andric union _LIBCPP_TEMPLATE_VIS __union<destructible_trait, _Index, _Tp, _Types...> { \ 6760b57cec5SDimitry Andric public: \ 677cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI explicit constexpr __union(__valueless_t) noexcept : __dummy{} {} \ 6780b57cec5SDimitry Andric \ 6790b57cec5SDimitry Andric template <class... _Args> \ 680cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI explicit constexpr __union(in_place_index_t<0>, _Args&&... __args) \ 6815f757f3fSDimitry Andric : __head(in_place, std::forward<_Args>(__args)...) {} \ 6820b57cec5SDimitry Andric \ 6830b57cec5SDimitry Andric template <size_t _Ip, class... _Args> \ 684cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI explicit constexpr __union(in_place_index_t<_Ip>, _Args&&... __args) \ 6855f757f3fSDimitry Andric : __tail(in_place_index<_Ip - 1>, std::forward<_Args>(__args)...) {} \ 6860b57cec5SDimitry Andric \ 6870b57cec5SDimitry Andric __union(const __union&) = default; \ 6880b57cec5SDimitry Andric __union(__union&&) = default; \ 6890b57cec5SDimitry Andric \ 6900b57cec5SDimitry Andric destructor \ 6910b57cec5SDimitry Andric \ 692cb14a3feSDimitry Andric __union& \ 693cb14a3feSDimitry Andric operator=(const __union&) = default; \ 6940b57cec5SDimitry Andric __union& operator=(__union&&) = default; \ 6950b57cec5SDimitry Andric \ 6960b57cec5SDimitry Andric private: \ 6970b57cec5SDimitry Andric char __dummy; \ 6980b57cec5SDimitry Andric __alt<_Index, _Tp> __head; \ 6990b57cec5SDimitry Andric __union<destructible_trait, _Index + 1, _Types...> __tail; \ 7000b57cec5SDimitry Andric \ 7010b57cec5SDimitry Andric friend struct __access::__union; \ 7020b57cec5SDimitry Andric } 7030b57cec5SDimitry Andric 7040b57cec5SDimitry Andric_LIBCPP_VARIANT_UNION(_Trait::_TriviallyAvailable, ~__union() = default;); 7050b57cec5SDimitry Andric_LIBCPP_VARIANT_UNION(_Trait::_Available, ~__union(){}); 7060b57cec5SDimitry Andric_LIBCPP_VARIANT_UNION(_Trait::_Unavailable, ~__union() = delete;); 7070b57cec5SDimitry Andric 7080b57cec5SDimitry Andric# undef _LIBCPP_VARIANT_UNION 7090b57cec5SDimitry Andric 7100b57cec5SDimitry Andrictemplate <_Trait _DestructibleTrait, class... _Types> 7110b57cec5SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __base { 7120b57cec5SDimitry Andricpublic: 7130b57cec5SDimitry Andric using __index_t = __variant_index_t<sizeof...(_Types)>; 7140b57cec5SDimitry Andric 715cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI explicit constexpr __base(__valueless_t __tag) noexcept 716753f127fSDimitry Andric : __data(__tag), __index(__variant_npos<__index_t>) {} 7170b57cec5SDimitry Andric 7180b57cec5SDimitry Andric template <size_t _Ip, class... _Args> 719cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI explicit constexpr __base(in_place_index_t<_Ip>, _Args&&... __args) 720cb14a3feSDimitry Andric : __data(in_place_index<_Ip>, std::forward<_Args>(__args)...), __index(_Ip) {} 7210b57cec5SDimitry Andric 722cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr bool valueless_by_exception() const noexcept { return index() == variant_npos; } 7230b57cec5SDimitry Andric 724cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr size_t index() const noexcept { 7250b57cec5SDimitry Andric return __index == __variant_npos<__index_t> ? variant_npos : __index; 7260b57cec5SDimitry Andric } 7270b57cec5SDimitry Andric 7280b57cec5SDimitry Andricprotected: 729cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr auto&& __as_base() & { return *this; } 7300b57cec5SDimitry Andric 731cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr auto&& __as_base() && { return std::move(*this); } 7320b57cec5SDimitry Andric 733cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr auto&& __as_base() const& { return *this; } 7340b57cec5SDimitry Andric 735cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr auto&& __as_base() const&& { return std::move(*this); } 7360b57cec5SDimitry Andric 737cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static constexpr size_t __size() { return sizeof...(_Types); } 7380b57cec5SDimitry Andric 7390b57cec5SDimitry Andric __union<_DestructibleTrait, 0, _Types...> __data; 7400b57cec5SDimitry Andric __index_t __index; 7410b57cec5SDimitry Andric 7420b57cec5SDimitry Andric friend struct __access::__base; 7430b57cec5SDimitry Andric friend struct __visitation::__base; 7440b57cec5SDimitry Andric}; 7450b57cec5SDimitry Andric 7460b57cec5SDimitry Andrictemplate <class _Traits, _Trait = _Traits::__destructible_trait> 747e8d8bef9SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __dtor; 7480b57cec5SDimitry Andric 7490b57cec5SDimitry Andric# define _LIBCPP_VARIANT_DESTRUCTOR(destructible_trait, destructor, destroy) \ 7500b57cec5SDimitry Andric template <class... _Types> \ 751cb14a3feSDimitry Andric class _LIBCPP_TEMPLATE_VIS __dtor<__traits<_Types...>, destructible_trait> \ 7520b57cec5SDimitry Andric : public __base<destructible_trait, _Types...> { \ 7530b57cec5SDimitry Andric using __base_type = __base<destructible_trait, _Types...>; \ 7540b57cec5SDimitry Andric using __index_t = typename __base_type::__index_t; \ 7550b57cec5SDimitry Andric \ 7560b57cec5SDimitry Andric public: \ 7570b57cec5SDimitry Andric using __base_type::__base_type; \ 7580b57cec5SDimitry Andric using __base_type::operator=; \ 7590b57cec5SDimitry Andric \ 760e8d8bef9SDimitry Andric __dtor(const __dtor&) = default; \ 761e8d8bef9SDimitry Andric __dtor(__dtor&&) = default; \ 762cb14a3feSDimitry Andric destructor __dtor& operator=(const __dtor&) = default; \ 763e8d8bef9SDimitry Andric __dtor& operator=(__dtor&&) = default; \ 7640b57cec5SDimitry Andric \ 7650b57cec5SDimitry Andric protected: \ 766cb14a3feSDimitry Andric inline _LIBCPP_HIDE_FROM_ABI destroy \ 7670b57cec5SDimitry Andric } 7680b57cec5SDimitry Andric 7690b57cec5SDimitry Andric_LIBCPP_VARIANT_DESTRUCTOR( 770cb14a3feSDimitry Andric _Trait::_TriviallyAvailable, ~__dtor() = default; 771cb14a3feSDimitry Andric , void __destroy() noexcept { this->__index = __variant_npos<__index_t>; }); 7720b57cec5SDimitry Andric 7730b57cec5SDimitry Andric_LIBCPP_VARIANT_DESTRUCTOR( 7740b57cec5SDimitry Andric _Trait::_Available, 775e8d8bef9SDimitry Andric ~__dtor() { __destroy(); }, 7760b57cec5SDimitry Andric void __destroy() noexcept { 7770b57cec5SDimitry Andric if (!this->valueless_by_exception()) { 7780b57cec5SDimitry Andric __visitation::__base::__visit_alt( 7790b57cec5SDimitry Andric [](auto& __alt) noexcept { 780bdd1243dSDimitry Andric using __alt_type = __remove_cvref_t<decltype(__alt)>; 7810b57cec5SDimitry Andric __alt.~__alt_type(); 7820b57cec5SDimitry Andric }, 7830b57cec5SDimitry Andric *this); 7840b57cec5SDimitry Andric } 7850b57cec5SDimitry Andric this->__index = __variant_npos<__index_t>; 7860b57cec5SDimitry Andric }); 7870b57cec5SDimitry Andric 788cb14a3feSDimitry Andric_LIBCPP_VARIANT_DESTRUCTOR(_Trait::_Unavailable, ~__dtor() = delete;, void __destroy() noexcept = delete;); 7890b57cec5SDimitry Andric 7900b57cec5SDimitry Andric# undef _LIBCPP_VARIANT_DESTRUCTOR 7910b57cec5SDimitry Andric 7920b57cec5SDimitry Andrictemplate <class _Traits> 793e8d8bef9SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __ctor : public __dtor<_Traits> { 794e8d8bef9SDimitry Andric using __base_type = __dtor<_Traits>; 7950b57cec5SDimitry Andric 7960b57cec5SDimitry Andricpublic: 7970b57cec5SDimitry Andric using __base_type::__base_type; 7980b57cec5SDimitry Andric using __base_type::operator=; 7990b57cec5SDimitry Andric 8000b57cec5SDimitry Andricprotected: 8010b57cec5SDimitry Andric template <size_t _Ip, class _Tp, class... _Args> 802cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static _Tp& __construct_alt(__alt<_Ip, _Tp>& __a, _Args&&... __args) { 803cb14a3feSDimitry Andric ::new ((void*)std::addressof(__a)) __alt<_Ip, _Tp>(in_place, std::forward<_Args>(__args)...); 8040b57cec5SDimitry Andric return __a.__value; 8050b57cec5SDimitry Andric } 8060b57cec5SDimitry Andric 8070b57cec5SDimitry Andric template <class _Rhs> 808cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI static void __generic_construct(__ctor& __lhs, _Rhs&& __rhs) { 8090b57cec5SDimitry Andric __lhs.__destroy(); 8100b57cec5SDimitry Andric if (!__rhs.valueless_by_exception()) { 8117a6dacacSDimitry Andric auto __rhs_index = __rhs.index(); 8120b57cec5SDimitry Andric __visitation::__base::__visit_alt_at( 8137a6dacacSDimitry Andric __rhs_index, 8140b57cec5SDimitry Andric [](auto& __lhs_alt, auto&& __rhs_alt) { 815cb14a3feSDimitry Andric __construct_alt(__lhs_alt, std::forward<decltype(__rhs_alt)>(__rhs_alt).__value); 8160b57cec5SDimitry Andric }, 817cb14a3feSDimitry Andric __lhs, 818cb14a3feSDimitry Andric std::forward<_Rhs>(__rhs)); 8197a6dacacSDimitry Andric __lhs.__index = __rhs_index; 8200b57cec5SDimitry Andric } 8210b57cec5SDimitry Andric } 8220b57cec5SDimitry Andric}; 8230b57cec5SDimitry Andric 8240b57cec5SDimitry Andrictemplate <class _Traits, _Trait = _Traits::__move_constructible_trait> 8250b57cec5SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __move_constructor; 8260b57cec5SDimitry Andric 827cb14a3feSDimitry Andric# define _LIBCPP_VARIANT_MOVE_CONSTRUCTOR(move_constructible_trait, move_constructor) \ 8280b57cec5SDimitry Andric template <class... _Types> \ 829cb14a3feSDimitry Andric class _LIBCPP_TEMPLATE_VIS __move_constructor<__traits<_Types...>, move_constructible_trait> \ 830e8d8bef9SDimitry Andric : public __ctor<__traits<_Types...>> { \ 831e8d8bef9SDimitry Andric using __base_type = __ctor<__traits<_Types...>>; \ 8320b57cec5SDimitry Andric \ 8330b57cec5SDimitry Andric public: \ 8340b57cec5SDimitry Andric using __base_type::__base_type; \ 8350b57cec5SDimitry Andric using __base_type::operator=; \ 8360b57cec5SDimitry Andric \ 8370b57cec5SDimitry Andric __move_constructor(const __move_constructor&) = default; \ 838cb14a3feSDimitry Andric move_constructor ~__move_constructor() = default; \ 8390b57cec5SDimitry Andric __move_constructor& operator=(const __move_constructor&) = default; \ 8400b57cec5SDimitry Andric __move_constructor& operator=(__move_constructor&&) = default; \ 8410b57cec5SDimitry Andric } 8420b57cec5SDimitry Andric 843cb14a3feSDimitry Andric_LIBCPP_VARIANT_MOVE_CONSTRUCTOR(_Trait::_TriviallyAvailable, 8440b57cec5SDimitry Andric __move_constructor(__move_constructor&& __that) = default;); 8450b57cec5SDimitry Andric 8460b57cec5SDimitry Andric_LIBCPP_VARIANT_MOVE_CONSTRUCTOR( 8470b57cec5SDimitry Andric _Trait::_Available, 848cb14a3feSDimitry Andric __move_constructor(__move_constructor&& __that) noexcept(__all<is_nothrow_move_constructible_v<_Types>...>::value) 849cb14a3feSDimitry Andric : __move_constructor(__valueless_t{}) { this->__generic_construct(*this, std::move(__that)); }); 8500b57cec5SDimitry Andric 851cb14a3feSDimitry Andric_LIBCPP_VARIANT_MOVE_CONSTRUCTOR(_Trait::_Unavailable, __move_constructor(__move_constructor&&) = delete;); 8520b57cec5SDimitry Andric 8530b57cec5SDimitry Andric# undef _LIBCPP_VARIANT_MOVE_CONSTRUCTOR 8540b57cec5SDimitry Andric 8550b57cec5SDimitry Andrictemplate <class _Traits, _Trait = _Traits::__copy_constructible_trait> 8560b57cec5SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __copy_constructor; 8570b57cec5SDimitry Andric 858cb14a3feSDimitry Andric# define _LIBCPP_VARIANT_COPY_CONSTRUCTOR(copy_constructible_trait, copy_constructor) \ 8590b57cec5SDimitry Andric template <class... _Types> \ 860cb14a3feSDimitry Andric class _LIBCPP_TEMPLATE_VIS __copy_constructor<__traits<_Types...>, copy_constructible_trait> \ 8610b57cec5SDimitry Andric : public __move_constructor<__traits<_Types...>> { \ 8620b57cec5SDimitry Andric using __base_type = __move_constructor<__traits<_Types...>>; \ 8630b57cec5SDimitry Andric \ 8640b57cec5SDimitry Andric public: \ 8650b57cec5SDimitry Andric using __base_type::__base_type; \ 8660b57cec5SDimitry Andric using __base_type::operator=; \ 8670b57cec5SDimitry Andric \ 868cb14a3feSDimitry Andric copy_constructor __copy_constructor(__copy_constructor&&) = default; \ 8690b57cec5SDimitry Andric ~__copy_constructor() = default; \ 8700b57cec5SDimitry Andric __copy_constructor& operator=(const __copy_constructor&) = default; \ 8710b57cec5SDimitry Andric __copy_constructor& operator=(__copy_constructor&&) = default; \ 8720b57cec5SDimitry Andric } 8730b57cec5SDimitry Andric 874cb14a3feSDimitry Andric_LIBCPP_VARIANT_COPY_CONSTRUCTOR(_Trait::_TriviallyAvailable, 8750b57cec5SDimitry Andric __copy_constructor(const __copy_constructor& __that) = default;); 8760b57cec5SDimitry Andric 8770b57cec5SDimitry Andric_LIBCPP_VARIANT_COPY_CONSTRUCTOR( 878cb14a3feSDimitry Andric _Trait::_Available, __copy_constructor(const __copy_constructor& __that) 879cb14a3feSDimitry Andric : __copy_constructor(__valueless_t{}) { this->__generic_construct(*this, __that); }); 8800b57cec5SDimitry Andric 881cb14a3feSDimitry Andric_LIBCPP_VARIANT_COPY_CONSTRUCTOR(_Trait::_Unavailable, __copy_constructor(const __copy_constructor&) = delete;); 8820b57cec5SDimitry Andric 8830b57cec5SDimitry Andric# undef _LIBCPP_VARIANT_COPY_CONSTRUCTOR 8840b57cec5SDimitry Andric 8850b57cec5SDimitry Andrictemplate <class _Traits> 8860b57cec5SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __assignment : public __copy_constructor<_Traits> { 8870b57cec5SDimitry Andric using __base_type = __copy_constructor<_Traits>; 8880b57cec5SDimitry Andric 8890b57cec5SDimitry Andricpublic: 8900b57cec5SDimitry Andric using __base_type::__base_type; 8910b57cec5SDimitry Andric using __base_type::operator=; 8920b57cec5SDimitry Andric 8930b57cec5SDimitry Andric template <size_t _Ip, class... _Args> 894cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI auto& __emplace(_Args&&... __args) { 8950b57cec5SDimitry Andric this->__destroy(); 896cb14a3feSDimitry Andric auto& __res = this->__construct_alt(__access::__base::__get_alt<_Ip>(*this), std::forward<_Args>(__args)...); 8970b57cec5SDimitry Andric this->__index = _Ip; 8980b57cec5SDimitry Andric return __res; 8990b57cec5SDimitry Andric } 9000b57cec5SDimitry Andric 9010b57cec5SDimitry Andricprotected: 9020b57cec5SDimitry Andric template <size_t _Ip, class _Tp, class _Arg> 903cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI void __assign_alt(__alt<_Ip, _Tp>& __a, _Arg&& __arg) { 9040b57cec5SDimitry Andric if (this->index() == _Ip) { 9055f757f3fSDimitry Andric __a.__value = std::forward<_Arg>(__arg); 9060b57cec5SDimitry Andric } else { 9070b57cec5SDimitry Andric struct { 908cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI void operator()(true_type) const { __this->__emplace<_Ip>(std::forward<_Arg>(__arg)); } 90906c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI void operator()(false_type) const { 9105f757f3fSDimitry Andric __this->__emplace<_Ip>(_Tp(std::forward<_Arg>(__arg))); 9110b57cec5SDimitry Andric } 9120b57cec5SDimitry Andric __assignment* __this; 9130b57cec5SDimitry Andric _Arg&& __arg; 9145f757f3fSDimitry Andric } __impl{this, std::forward<_Arg>(__arg)}; 915cb14a3feSDimitry Andric __impl(bool_constant < is_nothrow_constructible_v<_Tp, _Arg> || !is_nothrow_move_constructible_v < _Tp >> {}); 9160b57cec5SDimitry Andric } 9170b57cec5SDimitry Andric } 9180b57cec5SDimitry Andric 9190b57cec5SDimitry Andric template <class _That> 920cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI void __generic_assign(_That&& __that) { 9210b57cec5SDimitry Andric if (this->valueless_by_exception() && __that.valueless_by_exception()) { 9220b57cec5SDimitry Andric // do nothing. 9230b57cec5SDimitry Andric } else if (__that.valueless_by_exception()) { 9240b57cec5SDimitry Andric this->__destroy(); 9250b57cec5SDimitry Andric } else { 9260b57cec5SDimitry Andric __visitation::__base::__visit_alt_at( 9270b57cec5SDimitry Andric __that.index(), 9280b57cec5SDimitry Andric [this](auto& __this_alt, auto&& __that_alt) { 929cb14a3feSDimitry Andric this->__assign_alt(__this_alt, std::forward<decltype(__that_alt)>(__that_alt).__value); 9300b57cec5SDimitry Andric }, 931cb14a3feSDimitry Andric *this, 932cb14a3feSDimitry Andric std::forward<_That>(__that)); 9330b57cec5SDimitry Andric } 9340b57cec5SDimitry Andric } 9350b57cec5SDimitry Andric}; 9360b57cec5SDimitry Andric 9370b57cec5SDimitry Andrictemplate <class _Traits, _Trait = _Traits::__move_assignable_trait> 9380b57cec5SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __move_assignment; 9390b57cec5SDimitry Andric 940cb14a3feSDimitry Andric# define _LIBCPP_VARIANT_MOVE_ASSIGNMENT(move_assignable_trait, move_assignment) \ 9410b57cec5SDimitry Andric template <class... _Types> \ 942cb14a3feSDimitry Andric class _LIBCPP_TEMPLATE_VIS __move_assignment<__traits<_Types...>, move_assignable_trait> \ 9430b57cec5SDimitry Andric : public __assignment<__traits<_Types...>> { \ 9440b57cec5SDimitry Andric using __base_type = __assignment<__traits<_Types...>>; \ 9450b57cec5SDimitry Andric \ 9460b57cec5SDimitry Andric public: \ 9470b57cec5SDimitry Andric using __base_type::__base_type; \ 9480b57cec5SDimitry Andric using __base_type::operator=; \ 9490b57cec5SDimitry Andric \ 9500b57cec5SDimitry Andric __move_assignment(const __move_assignment&) = default; \ 9510b57cec5SDimitry Andric __move_assignment(__move_assignment&&) = default; \ 9520b57cec5SDimitry Andric ~__move_assignment() = default; \ 9530b57cec5SDimitry Andric __move_assignment& operator=(const __move_assignment&) = default; \ 9540b57cec5SDimitry Andric move_assignment \ 9550b57cec5SDimitry Andric } 9560b57cec5SDimitry Andric 957cb14a3feSDimitry Andric_LIBCPP_VARIANT_MOVE_ASSIGNMENT(_Trait::_TriviallyAvailable, 9580b57cec5SDimitry Andric __move_assignment& operator=(__move_assignment&& __that) = default;); 9590b57cec5SDimitry Andric 9600b57cec5SDimitry Andric_LIBCPP_VARIANT_MOVE_ASSIGNMENT( 9610b57cec5SDimitry Andric _Trait::_Available, 962cb14a3feSDimitry Andric __move_assignment& 963cb14a3feSDimitry Andric operator=(__move_assignment&& __that) noexcept( 964cb14a3feSDimitry Andric __all<(is_nothrow_move_constructible_v<_Types> && is_nothrow_move_assignable_v<_Types>)...>::value) { 9655f757f3fSDimitry Andric this->__generic_assign(std::move(__that)); 9660b57cec5SDimitry Andric return *this; 9670b57cec5SDimitry Andric }); 9680b57cec5SDimitry Andric 969cb14a3feSDimitry Andric_LIBCPP_VARIANT_MOVE_ASSIGNMENT(_Trait::_Unavailable, __move_assignment& operator=(__move_assignment&&) = delete;); 9700b57cec5SDimitry Andric 9710b57cec5SDimitry Andric# undef _LIBCPP_VARIANT_MOVE_ASSIGNMENT 9720b57cec5SDimitry Andric 9730b57cec5SDimitry Andrictemplate <class _Traits, _Trait = _Traits::__copy_assignable_trait> 9740b57cec5SDimitry Andricclass _LIBCPP_TEMPLATE_VIS __copy_assignment; 9750b57cec5SDimitry Andric 976cb14a3feSDimitry Andric# define _LIBCPP_VARIANT_COPY_ASSIGNMENT(copy_assignable_trait, copy_assignment) \ 9770b57cec5SDimitry Andric template <class... _Types> \ 978cb14a3feSDimitry Andric class _LIBCPP_TEMPLATE_VIS __copy_assignment<__traits<_Types...>, copy_assignable_trait> \ 9790b57cec5SDimitry Andric : public __move_assignment<__traits<_Types...>> { \ 9800b57cec5SDimitry Andric using __base_type = __move_assignment<__traits<_Types...>>; \ 9810b57cec5SDimitry Andric \ 9820b57cec5SDimitry Andric public: \ 9830b57cec5SDimitry Andric using __base_type::__base_type; \ 9840b57cec5SDimitry Andric using __base_type::operator=; \ 9850b57cec5SDimitry Andric \ 9860b57cec5SDimitry Andric __copy_assignment(const __copy_assignment&) = default; \ 9870b57cec5SDimitry Andric __copy_assignment(__copy_assignment&&) = default; \ 9880b57cec5SDimitry Andric ~__copy_assignment() = default; \ 989cb14a3feSDimitry Andric copy_assignment __copy_assignment& operator=(__copy_assignment&&) = default; \ 9900b57cec5SDimitry Andric } 9910b57cec5SDimitry Andric 992cb14a3feSDimitry Andric_LIBCPP_VARIANT_COPY_ASSIGNMENT(_Trait::_TriviallyAvailable, 9930b57cec5SDimitry Andric __copy_assignment& operator=(const __copy_assignment& __that) = default;); 9940b57cec5SDimitry Andric 9950b57cec5SDimitry Andric_LIBCPP_VARIANT_COPY_ASSIGNMENT( 996cb14a3feSDimitry Andric _Trait::_Available, __copy_assignment& operator=(const __copy_assignment& __that) { 9970b57cec5SDimitry Andric this->__generic_assign(__that); 9980b57cec5SDimitry Andric return *this; 9990b57cec5SDimitry Andric }); 10000b57cec5SDimitry Andric 1001cb14a3feSDimitry Andric_LIBCPP_VARIANT_COPY_ASSIGNMENT(_Trait::_Unavailable, __copy_assignment& operator=(const __copy_assignment&) = delete;); 10020b57cec5SDimitry Andric 10030b57cec5SDimitry Andric# undef _LIBCPP_VARIANT_COPY_ASSIGNMENT 10040b57cec5SDimitry Andric 10050b57cec5SDimitry Andrictemplate <class... _Types> 1006cb14a3feSDimitry Andricclass _LIBCPP_TEMPLATE_VIS __impl : public __copy_assignment<__traits<_Types...>> { 10070b57cec5SDimitry Andric using __base_type = __copy_assignment<__traits<_Types...>>; 10080b57cec5SDimitry Andric 10090b57cec5SDimitry Andricpublic: 101081ad6265SDimitry Andric using __base_type::__base_type; // get in_place_index_t constructor & friends 101106c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI __impl(__impl const&) = default; 101206c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI __impl(__impl&&) = default; 101306c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI __impl& operator=(__impl const&) = default; 101406c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI __impl& operator=(__impl&&) = default; 10150b57cec5SDimitry Andric 10160b57cec5SDimitry Andric template <size_t _Ip, class _Arg> 1017cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI void __assign(_Arg&& __arg) { 1018cb14a3feSDimitry Andric this->__assign_alt(__access::__base::__get_alt<_Ip>(*this), std::forward<_Arg>(__arg)); 10190b57cec5SDimitry Andric } 10200b57cec5SDimitry Andric 1021cb14a3feSDimitry Andric inline _LIBCPP_HIDE_FROM_ABI void __swap(__impl& __that) { 10220b57cec5SDimitry Andric if (this->valueless_by_exception() && __that.valueless_by_exception()) { 10230b57cec5SDimitry Andric // do nothing. 10240b57cec5SDimitry Andric } else if (this->index() == __that.index()) { 10250b57cec5SDimitry Andric __visitation::__base::__visit_alt_at( 10260b57cec5SDimitry Andric this->index(), 10270b57cec5SDimitry Andric [](auto& __this_alt, auto& __that_alt) { 10285f757f3fSDimitry Andric using std::swap; 10290b57cec5SDimitry Andric swap(__this_alt.__value, __that_alt.__value); 10300b57cec5SDimitry Andric }, 10310b57cec5SDimitry Andric *this, 10320b57cec5SDimitry Andric __that); 10330b57cec5SDimitry Andric } else { 10340b57cec5SDimitry Andric __impl* __lhs = this; 10355f757f3fSDimitry Andric __impl* __rhs = std::addressof(__that); 10360b57cec5SDimitry Andric if (__lhs->__move_nothrow() && !__rhs->__move_nothrow()) { 10375f757f3fSDimitry Andric std::swap(__lhs, __rhs); 10380b57cec5SDimitry Andric } 10395f757f3fSDimitry Andric __impl __tmp(std::move(*__rhs)); 104006c3fb27SDimitry Andric# ifndef _LIBCPP_HAS_NO_EXCEPTIONS 10415ffd83dbSDimitry Andric if constexpr (__all<is_nothrow_move_constructible_v<_Types>...>::value) { 10425f757f3fSDimitry Andric this->__generic_construct(*__rhs, std::move(*__lhs)); 10435ffd83dbSDimitry Andric } else { 10440b57cec5SDimitry Andric // EXTENSION: When the move construction of `__lhs` into `__rhs` throws 10450b57cec5SDimitry Andric // and `__tmp` is nothrow move constructible then we move `__tmp` back 10460b57cec5SDimitry Andric // into `__rhs` and provide the strong exception safety guarantee. 10470b57cec5SDimitry Andric try { 10485f757f3fSDimitry Andric this->__generic_construct(*__rhs, std::move(*__lhs)); 10490b57cec5SDimitry Andric } catch (...) { 10500b57cec5SDimitry Andric if (__tmp.__move_nothrow()) { 10515f757f3fSDimitry Andric this->__generic_construct(*__rhs, std::move(__tmp)); 10520b57cec5SDimitry Andric } 10530b57cec5SDimitry Andric throw; 10540b57cec5SDimitry Andric } 10555ffd83dbSDimitry Andric } 10560b57cec5SDimitry Andric# else 10575ffd83dbSDimitry Andric // this isn't consolidated with the `if constexpr` branch above due to 10585ffd83dbSDimitry Andric // `throw` being ill-formed with exceptions disabled even when discarded. 10595f757f3fSDimitry Andric this->__generic_construct(*__rhs, std::move(*__lhs)); 10600b57cec5SDimitry Andric# endif 10615f757f3fSDimitry Andric this->__generic_construct(*__lhs, std::move(__tmp)); 10620b57cec5SDimitry Andric } 10630b57cec5SDimitry Andric } 10640b57cec5SDimitry Andric 10650b57cec5SDimitry Andricprivate: 1066cb14a3feSDimitry Andric inline _LIBCPP_HIDE_FROM_ABI bool __move_nothrow() const { 10670b57cec5SDimitry Andric constexpr bool __results[] = {is_nothrow_move_constructible_v<_Types>...}; 10680b57cec5SDimitry Andric return this->valueless_by_exception() || __results[this->index()]; 10690b57cec5SDimitry Andric } 10700b57cec5SDimitry Andric}; 10710b57cec5SDimitry Andric 10720b57cec5SDimitry Andricstruct __no_narrowing_check { 10730b57cec5SDimitry Andric template <class _Dest, class _Source> 107481ad6265SDimitry Andric using _Apply = __type_identity<_Dest>; 10750b57cec5SDimitry Andric}; 10760b57cec5SDimitry Andric 10770b57cec5SDimitry Andricstruct __narrowing_check { 10780b57cec5SDimitry Andric template <class _Dest> 107981ad6265SDimitry Andric static auto __test_impl(_Dest (&&)[1]) -> __type_identity<_Dest>; 10800b57cec5SDimitry Andric template <class _Dest, class _Source> 1081bdd1243dSDimitry Andric using _Apply _LIBCPP_NODEBUG = decltype(__test_impl<_Dest>({std::declval<_Source>()})); 10820b57cec5SDimitry Andric}; 10830b57cec5SDimitry Andric 10840b57cec5SDimitry Andrictemplate <class _Dest, class _Source> 1085cb14a3feSDimitry Andricusing __check_for_narrowing _LIBCPP_NODEBUG = typename _If< 10860b57cec5SDimitry Andric# ifdef _LIBCPP_ENABLE_NARROWING_CONVERSIONS_IN_VARIANT 10870b57cec5SDimitry Andric false && 10880b57cec5SDimitry Andric# endif 10890b57cec5SDimitry Andric is_arithmetic<_Dest>::value, 10900b57cec5SDimitry Andric __narrowing_check, 1091cb14a3feSDimitry Andric __no_narrowing_check >::template _Apply<_Dest, _Source>; 10920b57cec5SDimitry Andric 10930b57cec5SDimitry Andrictemplate <class _Tp, size_t _Idx> 10940b57cec5SDimitry Andricstruct __overload { 10950b57cec5SDimitry Andric template <class _Up> 10960b57cec5SDimitry Andric auto operator()(_Tp, _Up&&) const -> __check_for_narrowing<_Tp, _Up>; 10970b57cec5SDimitry Andric}; 10980b57cec5SDimitry Andric 10995f757f3fSDimitry Andric// TODO(LLVM-19): Remove all occurrences of this macro. 11005f757f3fSDimitry Andric# ifdef _LIBCPP_ENABLE_NARROWING_CONVERSIONS_IN_VARIANT 11010b57cec5SDimitry Andrictemplate <class _Tp, size_t> 11020b57cec5SDimitry Andricstruct __overload_bool { 1103bdd1243dSDimitry Andric template <class _Up, class _Ap = __remove_cvref_t<_Up>> 1104cb14a3feSDimitry Andric auto operator()(bool, _Up&&) const -> enable_if_t<is_same_v<_Ap, bool>, __type_identity<_Tp>>; 11050b57cec5SDimitry Andric}; 11060b57cec5SDimitry Andric 11070b57cec5SDimitry Andrictemplate <size_t _Idx> 11080b57cec5SDimitry Andricstruct __overload<bool, _Idx> : __overload_bool<bool, _Idx> {}; 11090b57cec5SDimitry Andrictemplate <size_t _Idx> 11100b57cec5SDimitry Andricstruct __overload<bool const, _Idx> : __overload_bool<bool const, _Idx> {}; 11110b57cec5SDimitry Andrictemplate <size_t _Idx> 11120b57cec5SDimitry Andricstruct __overload<bool volatile, _Idx> : __overload_bool<bool volatile, _Idx> {}; 11130b57cec5SDimitry Andrictemplate <size_t _Idx> 11140b57cec5SDimitry Andricstruct __overload<bool const volatile, _Idx> : __overload_bool<bool const volatile, _Idx> {}; 11155f757f3fSDimitry Andric# endif 11160b57cec5SDimitry Andric 11170b57cec5SDimitry Andrictemplate <class... _Bases> 11180b57cec5SDimitry Andricstruct __all_overloads : _Bases... { 11190b57cec5SDimitry Andric void operator()() const; 11200b57cec5SDimitry Andric using _Bases::operator()...; 11210b57cec5SDimitry Andric}; 11220b57cec5SDimitry Andric 112306c3fb27SDimitry Andrictemplate <class _IdxSeq> 11240b57cec5SDimitry Andricstruct __make_overloads_imp; 11250b57cec5SDimitry Andric 11260b57cec5SDimitry Andrictemplate <size_t... _Idx> 11270b57cec5SDimitry Andricstruct __make_overloads_imp<__tuple_indices<_Idx...> > { 11280b57cec5SDimitry Andric template <class... _Types> 1129349cc55cSDimitry Andric using _Apply _LIBCPP_NODEBUG = __all_overloads<__overload<_Types, _Idx>...>; 11300b57cec5SDimitry Andric}; 11310b57cec5SDimitry Andric 11320b57cec5SDimitry Andrictemplate <class... _Types> 1133cb14a3feSDimitry Andricusing _MakeOverloads _LIBCPP_NODEBUG = 1134cb14a3feSDimitry Andric typename __make_overloads_imp< __make_indices_imp<sizeof...(_Types), 0> >::template _Apply<_Types...>; 11350b57cec5SDimitry Andric 11360b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 1137cb14a3feSDimitry Andricusing __best_match_t = typename invoke_result_t<_MakeOverloads<_Types...>, _Tp, _Tp>::type; 11380b57cec5SDimitry Andric 11391fd87a68SDimitry Andric} // namespace __variant_detail 11400b57cec5SDimitry Andric 11417a6dacacSDimitry Andrictemplate <class _Visitor, class... _Vs, typename = void_t<decltype(std::__as_variant(std::declval<_Vs>()))...>> 11427a6dacacSDimitry Andric_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr decltype(auto) 11437a6dacacSDimitry Andricvisit(_Visitor&& __visitor, _Vs&&... __vs); 11447a6dacacSDimitry Andric 11457a6dacacSDimitry Andric# if _LIBCPP_STD_VER >= 20 11467a6dacacSDimitry Andrictemplate <class _Rp, 11477a6dacacSDimitry Andric class _Visitor, 11487a6dacacSDimitry Andric class... _Vs, 11497a6dacacSDimitry Andric typename = void_t<decltype(std::__as_variant(std::declval<_Vs>()))...>> 11507a6dacacSDimitry Andric_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr _Rp 11517a6dacacSDimitry Andricvisit(_Visitor&& __visitor, _Vs&&... __vs); 11527a6dacacSDimitry Andric# endif 11537a6dacacSDimitry Andric 11540b57cec5SDimitry Andrictemplate <class... _Types> 115506c3fb27SDimitry Andricclass _LIBCPP_TEMPLATE_VIS _LIBCPP_DECLSPEC_EMPTY_BASES variant 1156cb14a3feSDimitry Andric : private __sfinae_ctor_base< __all<is_copy_constructible_v<_Types>...>::value, 11570b57cec5SDimitry Andric __all<is_move_constructible_v<_Types>...>::value>, 11580b57cec5SDimitry Andric private __sfinae_assign_base< 1159cb14a3feSDimitry Andric __all<(is_copy_constructible_v<_Types> && is_copy_assignable_v<_Types>)...>::value, 1160cb14a3feSDimitry Andric __all<(is_move_constructible_v<_Types> && is_move_assignable_v<_Types>)...>::value> { 1161cb14a3feSDimitry Andric static_assert(0 < sizeof...(_Types), "variant must consist of at least one alternative."); 11620b57cec5SDimitry Andric 1163cb14a3feSDimitry Andric static_assert(__all<!is_array_v<_Types>...>::value, "variant can not have an array type as an alternative."); 11640b57cec5SDimitry Andric 1165cb14a3feSDimitry Andric static_assert(__all<!is_reference_v<_Types>...>::value, "variant can not have a reference type as an alternative."); 11660b57cec5SDimitry Andric 1167cb14a3feSDimitry Andric static_assert(__all<!is_void_v<_Types>...>::value, "variant can not have a void type as an alternative."); 11680b57cec5SDimitry Andric 11690b57cec5SDimitry Andric using __first_type = variant_alternative_t<0, variant>; 11700b57cec5SDimitry Andric 11710b57cec5SDimitry Andricpublic: 11720b57cec5SDimitry Andric template <bool _Dummy = true, 1173cb14a3feSDimitry Andric enable_if_t<__dependent_type<is_default_constructible<__first_type>, _Dummy>::value, int> = 0> 1174cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr variant() noexcept(is_nothrow_default_constructible_v<__first_type>) 1175bdd1243dSDimitry Andric : __impl_(in_place_index<0>) {} 11760b57cec5SDimitry Andric 117706c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr variant(const variant&) = default; 117806c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr variant(variant&&) = default; 11790b57cec5SDimitry Andric 1180cb14a3feSDimitry Andric template < class _Arg, 1181bdd1243dSDimitry Andric enable_if_t<!is_same_v<__remove_cvref_t<_Arg>, variant>, int> = 0, 1182bdd1243dSDimitry Andric enable_if_t<!__is_inplace_type<__remove_cvref_t<_Arg>>::value, int> = 0, 1183bdd1243dSDimitry Andric enable_if_t<!__is_inplace_index<__remove_cvref_t<_Arg>>::value, int> = 0, 11840b57cec5SDimitry Andric class _Tp = __variant_detail::__best_match_t<_Arg, _Types...>, 1185cb14a3feSDimitry Andric size_t _Ip = __find_detail::__find_unambiguous_index_sfinae<_Tp, _Types...>::value, 11860b57cec5SDimitry Andric enable_if_t<is_constructible_v<_Tp, _Arg>, int> = 0> 1187cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr variant(_Arg&& __arg) noexcept(is_nothrow_constructible_v<_Tp, _Arg>) 11885f757f3fSDimitry Andric : __impl_(in_place_index<_Ip>, std::forward<_Arg>(__arg)) {} 11890b57cec5SDimitry Andric 1190cb14a3feSDimitry Andric template <size_t _Ip, 1191cb14a3feSDimitry Andric class... _Args, 11920b57cec5SDimitry Andric class = enable_if_t<(_Ip < sizeof...(_Types)), int>, 11930b57cec5SDimitry Andric class _Tp = variant_alternative_t<_Ip, variant<_Types...>>, 11940b57cec5SDimitry Andric enable_if_t<is_constructible_v<_Tp, _Args...>, int> = 0> 1195cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI explicit constexpr variant(in_place_index_t<_Ip>, _Args&&... __args) noexcept( 1196cb14a3feSDimitry Andric is_nothrow_constructible_v<_Tp, _Args...>) 11975f757f3fSDimitry Andric : __impl_(in_place_index<_Ip>, std::forward<_Args>(__args)...) {} 11980b57cec5SDimitry Andric 1199cb14a3feSDimitry Andric template < size_t _Ip, 12000b57cec5SDimitry Andric class _Up, 12010b57cec5SDimitry Andric class... _Args, 12020b57cec5SDimitry Andric enable_if_t<(_Ip < sizeof...(_Types)), int> = 0, 12030b57cec5SDimitry Andric class _Tp = variant_alternative_t<_Ip, variant<_Types...>>, 1204cb14a3feSDimitry Andric enable_if_t<is_constructible_v<_Tp, initializer_list<_Up>&, _Args...>, int> = 0> 1205cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI explicit constexpr variant( 12060b57cec5SDimitry Andric in_place_index_t<_Ip>, 12070b57cec5SDimitry Andric initializer_list<_Up> __il, 1208cb14a3feSDimitry Andric _Args&&... __args) noexcept(is_nothrow_constructible_v<_Tp, initializer_list<_Up>&, _Args...>) 12095f757f3fSDimitry Andric : __impl_(in_place_index<_Ip>, __il, std::forward<_Args>(__args)...) {} 12100b57cec5SDimitry Andric 1211cb14a3feSDimitry Andric template < class _Tp, 12120b57cec5SDimitry Andric class... _Args, 1213cb14a3feSDimitry Andric size_t _Ip = __find_detail::__find_unambiguous_index_sfinae<_Tp, _Types...>::value, 12140b57cec5SDimitry Andric enable_if_t<is_constructible_v<_Tp, _Args...>, int> = 0> 1215cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI explicit constexpr variant(in_place_type_t<_Tp>, _Args&&... __args) noexcept( 12160b57cec5SDimitry Andric is_nothrow_constructible_v<_Tp, _Args...>) 12175f757f3fSDimitry Andric : __impl_(in_place_index<_Ip>, std::forward<_Args>(__args)...) {} 12180b57cec5SDimitry Andric 1219cb14a3feSDimitry Andric template < class _Tp, 12200b57cec5SDimitry Andric class _Up, 12210b57cec5SDimitry Andric class... _Args, 1222cb14a3feSDimitry Andric size_t _Ip = __find_detail::__find_unambiguous_index_sfinae<_Tp, _Types...>::value, 1223cb14a3feSDimitry Andric enable_if_t<is_constructible_v<_Tp, initializer_list<_Up>&, _Args...>, int> = 0> 1224cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI explicit constexpr variant( 12250b57cec5SDimitry Andric in_place_type_t<_Tp>, 12260b57cec5SDimitry Andric initializer_list<_Up> __il, 1227cb14a3feSDimitry Andric _Args&&... __args) noexcept(is_nothrow_constructible_v<_Tp, initializer_list< _Up>&, _Args...>) 12285f757f3fSDimitry Andric : __impl_(in_place_index<_Ip>, __il, std::forward<_Args>(__args)...) {} 12290b57cec5SDimitry Andric 123006c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI ~variant() = default; 12310b57cec5SDimitry Andric 123206c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr variant& operator=(const variant&) = default; 123306c3fb27SDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr variant& operator=(variant&&) = default; 12340b57cec5SDimitry Andric 1235cb14a3feSDimitry Andric template < class _Arg, 1236bdd1243dSDimitry Andric enable_if_t<!is_same_v<__remove_cvref_t<_Arg>, variant>, int> = 0, 12370b57cec5SDimitry Andric class _Tp = __variant_detail::__best_match_t<_Arg, _Types...>, 1238cb14a3feSDimitry Andric size_t _Ip = __find_detail::__find_unambiguous_index_sfinae<_Tp, _Types...>::value, 1239cb14a3feSDimitry Andric enable_if_t<is_assignable_v<_Tp&, _Arg> && is_constructible_v<_Tp, _Arg>, int> = 0> 1240cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI variant& 1241cb14a3feSDimitry Andric operator=(_Arg&& __arg) noexcept(is_nothrow_assignable_v<_Tp&, _Arg> && is_nothrow_constructible_v<_Tp, _Arg>) { 12425f757f3fSDimitry Andric __impl_.template __assign<_Ip>(std::forward<_Arg>(__arg)); 12430b57cec5SDimitry Andric return *this; 12440b57cec5SDimitry Andric } 12450b57cec5SDimitry Andric 1246cb14a3feSDimitry Andric template < size_t _Ip, 12470b57cec5SDimitry Andric class... _Args, 12480b57cec5SDimitry Andric enable_if_t<(_Ip < sizeof...(_Types)), int> = 0, 12490b57cec5SDimitry Andric class _Tp = variant_alternative_t<_Ip, variant<_Types...>>, 12500b57cec5SDimitry Andric enable_if_t<is_constructible_v<_Tp, _Args...>, int> = 0> 1251cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI _Tp& emplace(_Args&&... __args) { 12525f757f3fSDimitry Andric return __impl_.template __emplace<_Ip>(std::forward<_Args>(__args)...); 12530b57cec5SDimitry Andric } 12540b57cec5SDimitry Andric 1255cb14a3feSDimitry Andric template < size_t _Ip, 12560b57cec5SDimitry Andric class _Up, 12570b57cec5SDimitry Andric class... _Args, 12580b57cec5SDimitry Andric enable_if_t<(_Ip < sizeof...(_Types)), int> = 0, 12590b57cec5SDimitry Andric class _Tp = variant_alternative_t<_Ip, variant<_Types...>>, 1260cb14a3feSDimitry Andric enable_if_t<is_constructible_v<_Tp, initializer_list<_Up>&, _Args...>, int> = 0> 1261cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI _Tp& emplace(initializer_list<_Up> __il, _Args&&... __args) { 12625f757f3fSDimitry Andric return __impl_.template __emplace<_Ip>(__il, std::forward<_Args>(__args)...); 12630b57cec5SDimitry Andric } 12640b57cec5SDimitry Andric 1265cb14a3feSDimitry Andric template < class _Tp, 12660b57cec5SDimitry Andric class... _Args, 1267cb14a3feSDimitry Andric size_t _Ip = __find_detail::__find_unambiguous_index_sfinae<_Tp, _Types...>::value, 12680b57cec5SDimitry Andric enable_if_t<is_constructible_v<_Tp, _Args...>, int> = 0> 1269cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI _Tp& emplace(_Args&&... __args) { 12705f757f3fSDimitry Andric return __impl_.template __emplace<_Ip>(std::forward<_Args>(__args)...); 12710b57cec5SDimitry Andric } 12720b57cec5SDimitry Andric 1273cb14a3feSDimitry Andric template < class _Tp, 12740b57cec5SDimitry Andric class _Up, 12750b57cec5SDimitry Andric class... _Args, 1276cb14a3feSDimitry Andric size_t _Ip = __find_detail::__find_unambiguous_index_sfinae<_Tp, _Types...>::value, 1277cb14a3feSDimitry Andric enable_if_t<is_constructible_v<_Tp, initializer_list<_Up>&, _Args...>, int> = 0> 1278cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI _Tp& emplace(initializer_list<_Up> __il, _Args&&... __args) { 12795f757f3fSDimitry Andric return __impl_.template __emplace<_Ip>(__il, std::forward<_Args>(__args)...); 12800b57cec5SDimitry Andric } 12810b57cec5SDimitry Andric 1282cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr bool valueless_by_exception() const noexcept { 1283bdd1243dSDimitry Andric return __impl_.valueless_by_exception(); 12840b57cec5SDimitry Andric } 12850b57cec5SDimitry Andric 1286cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr size_t index() const noexcept { return __impl_.index(); } 12870b57cec5SDimitry Andric 1288cb14a3feSDimitry Andric template < bool _Dummy = true, 1289cb14a3feSDimitry Andric enable_if_t< __all<(__dependent_type<is_move_constructible<_Types>, _Dummy>::value && 12900b57cec5SDimitry Andric __dependent_type<is_swappable<_Types>, _Dummy>::value)...>::value, 12910b57cec5SDimitry Andric int> = 0> 1292cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI void swap(variant& __that) noexcept( 1293cb14a3feSDimitry Andric __all<(is_nothrow_move_constructible_v<_Types> && is_nothrow_swappable_v<_Types>)...>::value) { 1294bdd1243dSDimitry Andric __impl_.__swap(__that.__impl_); 12950b57cec5SDimitry Andric } 12960b57cec5SDimitry Andric 12977a6dacacSDimitry Andric# if _LIBCPP_STD_VER >= 26 && defined(_LIBCPP_HAS_EXPLICIT_THIS_PARAMETER) 12987a6dacacSDimitry Andric // Helper class to implement [variant.visit]/10 12997a6dacacSDimitry Andric // Constraints: The call to visit does not use an explicit template-argument-list 13007a6dacacSDimitry Andric // that begins with a type template-argument. 13017a6dacacSDimitry Andric struct __variant_visit_barrier_tag { 13027a6dacacSDimitry Andric _LIBCPP_HIDE_FROM_ABI explicit __variant_visit_barrier_tag() = default; 13037a6dacacSDimitry Andric }; 13047a6dacacSDimitry Andric 13057a6dacacSDimitry Andric template <__variant_visit_barrier_tag = __variant_visit_barrier_tag{}, class _Self, class _Visitor> 13067a6dacacSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) visit(this _Self&& __self, _Visitor&& __visitor) { 13077a6dacacSDimitry Andric using _VariantT = _OverrideRef<_Self&&, _CopyConst<remove_reference_t<_Self>, variant>>; 13087a6dacacSDimitry Andric return std::visit(std::forward<_Visitor>(__visitor), (_VariantT)__self); 13097a6dacacSDimitry Andric } 13107a6dacacSDimitry Andric 13117a6dacacSDimitry Andric template <class _Rp, class _Self, class _Visitor> 13127a6dacacSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr _Rp visit(this _Self&& __self, _Visitor&& __visitor) { 13137a6dacacSDimitry Andric using _VariantT = _OverrideRef<_Self&&, _CopyConst<remove_reference_t<_Self>, variant>>; 13147a6dacacSDimitry Andric return std::visit<_Rp>(std::forward<_Visitor>(__visitor), (_VariantT)__self); 13157a6dacacSDimitry Andric } 13167a6dacacSDimitry Andric# endif 13177a6dacacSDimitry Andric 13180b57cec5SDimitry Andricprivate: 1319bdd1243dSDimitry Andric __variant_detail::__impl<_Types...> __impl_; 13200b57cec5SDimitry Andric 13210b57cec5SDimitry Andric friend struct __variant_detail::__access::__variant; 13220b57cec5SDimitry Andric friend struct __variant_detail::__visitation::__variant; 13230b57cec5SDimitry Andric}; 13240b57cec5SDimitry Andric 13250b57cec5SDimitry Andrictemplate <size_t _Ip, class... _Types> 1326cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr bool __holds_alternative(const variant<_Types...>& __v) noexcept { 13270b57cec5SDimitry Andric return __v.index() == _Ip; 13280b57cec5SDimitry Andric} 13290b57cec5SDimitry Andric 13300b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 1331cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr bool holds_alternative(const variant<_Types...>& __v) noexcept { 1332bdd1243dSDimitry Andric return std::__holds_alternative<__find_exactly_one_t<_Tp, _Types...>::value>(__v); 13330b57cec5SDimitry Andric} 13340b57cec5SDimitry Andric 13350b57cec5SDimitry Andrictemplate <size_t _Ip, class _Vp> 1336cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr auto&& __generic_get(_Vp&& __v) { 13370b57cec5SDimitry Andric using __variant_detail::__access::__variant; 1338bdd1243dSDimitry Andric if (!std::__holds_alternative<_Ip>(__v)) { 13390b57cec5SDimitry Andric __throw_bad_variant_access(); 13400b57cec5SDimitry Andric } 13415f757f3fSDimitry Andric return __variant::__get_alt<_Ip>(std::forward<_Vp>(__v)).__value; 13420b57cec5SDimitry Andric} 13430b57cec5SDimitry Andric 13440b57cec5SDimitry Andrictemplate <size_t _Ip, class... _Types> 1345bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 1346cb14a3feSDimitry Andric _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr variant_alternative_t<_Ip, variant<_Types...>>& 1347cb14a3feSDimitry Andric get(variant<_Types...>& __v) { 13480b57cec5SDimitry Andric static_assert(_Ip < sizeof...(_Types)); 13490b57cec5SDimitry Andric static_assert(!is_void_v<variant_alternative_t<_Ip, variant<_Types...>>>); 1350bdd1243dSDimitry Andric return std::__generic_get<_Ip>(__v); 13510b57cec5SDimitry Andric} 13520b57cec5SDimitry Andric 13530b57cec5SDimitry Andrictemplate <size_t _Ip, class... _Types> 1354bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 1355cb14a3feSDimitry Andric _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr variant_alternative_t<_Ip, variant<_Types...>>&& 1356cb14a3feSDimitry Andric get(variant<_Types...>&& __v) { 13570b57cec5SDimitry Andric static_assert(_Ip < sizeof...(_Types)); 13580b57cec5SDimitry Andric static_assert(!is_void_v<variant_alternative_t<_Ip, variant<_Types...>>>); 13595f757f3fSDimitry Andric return std::__generic_get<_Ip>(std::move(__v)); 13600b57cec5SDimitry Andric} 13610b57cec5SDimitry Andric 13620b57cec5SDimitry Andrictemplate <size_t _Ip, class... _Types> 1363bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 1364cb14a3feSDimitry Andric _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr const variant_alternative_t<_Ip, variant<_Types...>>& 1365cb14a3feSDimitry Andric get(const variant<_Types...>& __v) { 13660b57cec5SDimitry Andric static_assert(_Ip < sizeof...(_Types)); 13670b57cec5SDimitry Andric static_assert(!is_void_v<variant_alternative_t<_Ip, variant<_Types...>>>); 1368bdd1243dSDimitry Andric return std::__generic_get<_Ip>(__v); 13690b57cec5SDimitry Andric} 13700b57cec5SDimitry Andric 13710b57cec5SDimitry Andrictemplate <size_t _Ip, class... _Types> 1372bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI 1373cb14a3feSDimitry Andric _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr const variant_alternative_t<_Ip, variant<_Types...>>&& 1374cb14a3feSDimitry Andric get(const variant<_Types...>&& __v) { 13750b57cec5SDimitry Andric static_assert(_Ip < sizeof...(_Types)); 13760b57cec5SDimitry Andric static_assert(!is_void_v<variant_alternative_t<_Ip, variant<_Types...>>>); 13775f757f3fSDimitry Andric return std::__generic_get<_Ip>(std::move(__v)); 13780b57cec5SDimitry Andric} 13790b57cec5SDimitry Andric 13800b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 1381cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr _Tp& get(variant<_Types...>& __v) { 13820b57cec5SDimitry Andric static_assert(!is_void_v<_Tp>); 13835f757f3fSDimitry Andric return std::get<__find_exactly_one_t<_Tp, _Types...>::value>(__v); 13840b57cec5SDimitry Andric} 13850b57cec5SDimitry Andric 13860b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 1387cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr _Tp&& get(variant<_Types...>&& __v) { 13880b57cec5SDimitry Andric static_assert(!is_void_v<_Tp>); 1389cb14a3feSDimitry Andric return std::get<__find_exactly_one_t<_Tp, _Types...>::value>(std::move(__v)); 13900b57cec5SDimitry Andric} 13910b57cec5SDimitry Andric 13920b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 1393cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr const _Tp& 1394cb14a3feSDimitry Andricget(const variant<_Types...>& __v) { 13950b57cec5SDimitry Andric static_assert(!is_void_v<_Tp>); 13965f757f3fSDimitry Andric return std::get<__find_exactly_one_t<_Tp, _Types...>::value>(__v); 13970b57cec5SDimitry Andric} 13980b57cec5SDimitry Andric 13990b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 1400cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr const _Tp&& 1401cb14a3feSDimitry Andricget(const variant<_Types...>&& __v) { 14020b57cec5SDimitry Andric static_assert(!is_void_v<_Tp>); 1403cb14a3feSDimitry Andric return std::get<__find_exactly_one_t<_Tp, _Types...>::value>(std::move(__v)); 14040b57cec5SDimitry Andric} 14050b57cec5SDimitry Andric 14060b57cec5SDimitry Andrictemplate <size_t _Ip, class _Vp> 1407cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr auto* __generic_get_if(_Vp* __v) noexcept { 14080b57cec5SDimitry Andric using __variant_detail::__access::__variant; 1409cb14a3feSDimitry Andric return __v && std::__holds_alternative<_Ip>(*__v) ? std::addressof(__variant::__get_alt<_Ip>(*__v).__value) : nullptr; 14100b57cec5SDimitry Andric} 14110b57cec5SDimitry Andric 14120b57cec5SDimitry Andrictemplate <size_t _Ip, class... _Types> 1413cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr add_pointer_t<variant_alternative_t<_Ip, variant<_Types...>>> 14140b57cec5SDimitry Andricget_if(variant<_Types...>* __v) noexcept { 14150b57cec5SDimitry Andric static_assert(_Ip < sizeof...(_Types)); 14160b57cec5SDimitry Andric static_assert(!is_void_v<variant_alternative_t<_Ip, variant<_Types...>>>); 1417bdd1243dSDimitry Andric return std::__generic_get_if<_Ip>(__v); 14180b57cec5SDimitry Andric} 14190b57cec5SDimitry Andric 14200b57cec5SDimitry Andrictemplate <size_t _Ip, class... _Types> 1421cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr add_pointer_t<const variant_alternative_t<_Ip, variant<_Types...>>> 14220b57cec5SDimitry Andricget_if(const variant<_Types...>* __v) noexcept { 14230b57cec5SDimitry Andric static_assert(_Ip < sizeof...(_Types)); 14240b57cec5SDimitry Andric static_assert(!is_void_v<variant_alternative_t<_Ip, variant<_Types...>>>); 1425bdd1243dSDimitry Andric return std::__generic_get_if<_Ip>(__v); 14260b57cec5SDimitry Andric} 14270b57cec5SDimitry Andric 14280b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 1429cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr add_pointer_t<_Tp> get_if(variant<_Types...>* __v) noexcept { 14300b57cec5SDimitry Andric static_assert(!is_void_v<_Tp>); 14315f757f3fSDimitry Andric return std::get_if<__find_exactly_one_t<_Tp, _Types...>::value>(__v); 14320b57cec5SDimitry Andric} 14330b57cec5SDimitry Andric 14340b57cec5SDimitry Andrictemplate <class _Tp, class... _Types> 1435cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr add_pointer_t<const _Tp> get_if(const variant<_Types...>* __v) noexcept { 14360b57cec5SDimitry Andric static_assert(!is_void_v<_Tp>); 14375f757f3fSDimitry Andric return std::get_if<__find_exactly_one_t<_Tp, _Types...>::value>(__v); 14380b57cec5SDimitry Andric} 14390b57cec5SDimitry Andric 14400b57cec5SDimitry Andrictemplate <class _Operator> 14410b57cec5SDimitry Andricstruct __convert_to_bool { 14420b57cec5SDimitry Andric template <class _T1, class _T2> 1443cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_T1&& __t1, _T2&& __t2) const { 14445f757f3fSDimitry Andric static_assert(is_convertible<decltype(_Operator{}(std::forward<_T1>(__t1), std::forward<_T2>(__t2))), bool>::value, 14450b57cec5SDimitry Andric "the relational operator does not return a type which is implicitly convertible to bool"); 14465f757f3fSDimitry Andric return _Operator{}(std::forward<_T1>(__t1), std::forward<_T2>(__t2)); 14470b57cec5SDimitry Andric } 14480b57cec5SDimitry Andric}; 14490b57cec5SDimitry Andric 14500b57cec5SDimitry Andrictemplate <class... _Types> 1451cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr bool operator==(const variant<_Types...>& __lhs, const variant<_Types...>& __rhs) { 14520b57cec5SDimitry Andric using __variant_detail::__visitation::__variant; 1453cb14a3feSDimitry Andric if (__lhs.index() != __rhs.index()) 1454cb14a3feSDimitry Andric return false; 1455cb14a3feSDimitry Andric if (__lhs.valueless_by_exception()) 1456cb14a3feSDimitry Andric return true; 14570b57cec5SDimitry Andric return __variant::__visit_value_at(__lhs.index(), __convert_to_bool<equal_to<>>{}, __lhs, __rhs); 14580b57cec5SDimitry Andric} 14590b57cec5SDimitry Andric 146006c3fb27SDimitry Andric# if _LIBCPP_STD_VER >= 20 1461bdd1243dSDimitry Andric 1462cb14a3feSDimitry Andrictemplate <class... _Types> 1463cb14a3feSDimitry Andric requires(three_way_comparable<_Types> && ...) 1464bdd1243dSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr common_comparison_category_t<compare_three_way_result_t<_Types>...> 1465bdd1243dSDimitry Andricoperator<=>(const variant<_Types...>& __lhs, const variant<_Types...>& __rhs) { 1466bdd1243dSDimitry Andric using __variant_detail::__visitation::__variant; 1467bdd1243dSDimitry Andric using __result_t = common_comparison_category_t<compare_three_way_result_t<_Types>...>; 1468bdd1243dSDimitry Andric if (__lhs.valueless_by_exception() && __rhs.valueless_by_exception()) 1469bdd1243dSDimitry Andric return strong_ordering::equal; 1470bdd1243dSDimitry Andric if (__lhs.valueless_by_exception()) 1471bdd1243dSDimitry Andric return strong_ordering::less; 1472bdd1243dSDimitry Andric if (__rhs.valueless_by_exception()) 1473bdd1243dSDimitry Andric return strong_ordering::greater; 1474bdd1243dSDimitry Andric if (auto __c = __lhs.index() <=> __rhs.index(); __c != 0) 1475bdd1243dSDimitry Andric return __c; 1476bdd1243dSDimitry Andric auto __three_way = []<class _Type>(const _Type& __v, const _Type& __w) -> __result_t { return __v <=> __w; }; 1477bdd1243dSDimitry Andric return __variant::__visit_value_at(__lhs.index(), __three_way, __lhs, __rhs); 1478bdd1243dSDimitry Andric} 1479bdd1243dSDimitry Andric 148006c3fb27SDimitry Andric# endif // _LIBCPP_STD_VER >= 20 1481bdd1243dSDimitry Andric 14820b57cec5SDimitry Andrictemplate <class... _Types> 1483cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr bool operator!=(const variant<_Types...>& __lhs, const variant<_Types...>& __rhs) { 14840b57cec5SDimitry Andric using __variant_detail::__visitation::__variant; 1485cb14a3feSDimitry Andric if (__lhs.index() != __rhs.index()) 1486cb14a3feSDimitry Andric return true; 1487cb14a3feSDimitry Andric if (__lhs.valueless_by_exception()) 1488cb14a3feSDimitry Andric return false; 1489cb14a3feSDimitry Andric return __variant::__visit_value_at(__lhs.index(), __convert_to_bool<not_equal_to<>>{}, __lhs, __rhs); 14900b57cec5SDimitry Andric} 14910b57cec5SDimitry Andric 14920b57cec5SDimitry Andrictemplate <class... _Types> 1493cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr bool operator<(const variant<_Types...>& __lhs, const variant<_Types...>& __rhs) { 14940b57cec5SDimitry Andric using __variant_detail::__visitation::__variant; 1495cb14a3feSDimitry Andric if (__rhs.valueless_by_exception()) 1496cb14a3feSDimitry Andric return false; 1497cb14a3feSDimitry Andric if (__lhs.valueless_by_exception()) 1498cb14a3feSDimitry Andric return true; 1499cb14a3feSDimitry Andric if (__lhs.index() < __rhs.index()) 1500cb14a3feSDimitry Andric return true; 1501cb14a3feSDimitry Andric if (__lhs.index() > __rhs.index()) 1502cb14a3feSDimitry Andric return false; 15030b57cec5SDimitry Andric return __variant::__visit_value_at(__lhs.index(), __convert_to_bool<less<>>{}, __lhs, __rhs); 15040b57cec5SDimitry Andric} 15050b57cec5SDimitry Andric 15060b57cec5SDimitry Andrictemplate <class... _Types> 1507cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr bool operator>(const variant<_Types...>& __lhs, const variant<_Types...>& __rhs) { 15080b57cec5SDimitry Andric using __variant_detail::__visitation::__variant; 1509cb14a3feSDimitry Andric if (__lhs.valueless_by_exception()) 1510cb14a3feSDimitry Andric return false; 1511cb14a3feSDimitry Andric if (__rhs.valueless_by_exception()) 1512cb14a3feSDimitry Andric return true; 1513cb14a3feSDimitry Andric if (__lhs.index() > __rhs.index()) 1514cb14a3feSDimitry Andric return true; 1515cb14a3feSDimitry Andric if (__lhs.index() < __rhs.index()) 1516cb14a3feSDimitry Andric return false; 15170b57cec5SDimitry Andric return __variant::__visit_value_at(__lhs.index(), __convert_to_bool<greater<>>{}, __lhs, __rhs); 15180b57cec5SDimitry Andric} 15190b57cec5SDimitry Andric 15200b57cec5SDimitry Andrictemplate <class... _Types> 1521cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(const variant<_Types...>& __lhs, const variant<_Types...>& __rhs) { 15220b57cec5SDimitry Andric using __variant_detail::__visitation::__variant; 1523cb14a3feSDimitry Andric if (__lhs.valueless_by_exception()) 1524cb14a3feSDimitry Andric return true; 1525cb14a3feSDimitry Andric if (__rhs.valueless_by_exception()) 1526cb14a3feSDimitry Andric return false; 1527cb14a3feSDimitry Andric if (__lhs.index() < __rhs.index()) 1528cb14a3feSDimitry Andric return true; 1529cb14a3feSDimitry Andric if (__lhs.index() > __rhs.index()) 1530cb14a3feSDimitry Andric return false; 1531cb14a3feSDimitry Andric return __variant::__visit_value_at(__lhs.index(), __convert_to_bool<less_equal<>>{}, __lhs, __rhs); 15320b57cec5SDimitry Andric} 15330b57cec5SDimitry Andric 15340b57cec5SDimitry Andrictemplate <class... _Types> 1535cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(const variant<_Types...>& __lhs, const variant<_Types...>& __rhs) { 15360b57cec5SDimitry Andric using __variant_detail::__visitation::__variant; 1537cb14a3feSDimitry Andric if (__rhs.valueless_by_exception()) 1538cb14a3feSDimitry Andric return true; 1539cb14a3feSDimitry Andric if (__lhs.valueless_by_exception()) 1540cb14a3feSDimitry Andric return false; 1541cb14a3feSDimitry Andric if (__lhs.index() > __rhs.index()) 1542cb14a3feSDimitry Andric return true; 1543cb14a3feSDimitry Andric if (__lhs.index() < __rhs.index()) 1544cb14a3feSDimitry Andric return false; 1545cb14a3feSDimitry Andric return __variant::__visit_value_at(__lhs.index(), __convert_to_bool<greater_equal<>>{}, __lhs, __rhs); 15460b57cec5SDimitry Andric} 15470b57cec5SDimitry Andric 1548e8d8bef9SDimitry Andrictemplate <class... _Vs> 1549cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr void __throw_if_valueless(_Vs&&... __vs) { 1550cb14a3feSDimitry Andric const bool __valueless = (... || std::__as_variant(__vs).valueless_by_exception()); 1551e8d8bef9SDimitry Andric if (__valueless) { 1552e8d8bef9SDimitry Andric __throw_bad_variant_access(); 1553e8d8bef9SDimitry Andric } 1554e8d8bef9SDimitry Andric} 1555e8d8bef9SDimitry Andric 15567a6dacacSDimitry Andrictemplate < class _Visitor, class... _Vs, typename> 1557cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr decltype(auto) 1558cb14a3feSDimitry Andricvisit(_Visitor&& __visitor, _Vs&&... __vs) { 15590b57cec5SDimitry Andric using __variant_detail::__visitation::__variant; 15605f757f3fSDimitry Andric std::__throw_if_valueless(std::forward<_Vs>(__vs)...); 1561cb14a3feSDimitry Andric return __variant::__visit_value(std::forward<_Visitor>(__visitor), std::forward<_Vs>(__vs)...); 15620b57cec5SDimitry Andric} 15630b57cec5SDimitry Andric 156406c3fb27SDimitry Andric# if _LIBCPP_STD_VER >= 20 15657a6dacacSDimitry Andrictemplate < class _Rp, class _Visitor, class... _Vs, typename> 1566cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr _Rp 1567cb14a3feSDimitry Andricvisit(_Visitor&& __visitor, _Vs&&... __vs) { 1568e8d8bef9SDimitry Andric using __variant_detail::__visitation::__variant; 15695f757f3fSDimitry Andric std::__throw_if_valueless(std::forward<_Vs>(__vs)...); 1570cb14a3feSDimitry Andric return __variant::__visit_value<_Rp>(std::forward<_Visitor>(__visitor), std::forward<_Vs>(__vs)...); 1571e8d8bef9SDimitry Andric} 1572e8d8bef9SDimitry Andric# endif 1573e8d8bef9SDimitry Andric 15740b57cec5SDimitry Andrictemplate <class... _Types> 1575cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI auto 1576cb14a3feSDimitry Andricswap(variant<_Types...>& __lhs, variant<_Types...>& __rhs) noexcept(noexcept(__lhs.swap(__rhs))) 1577cb14a3feSDimitry Andric -> decltype(__lhs.swap(__rhs)) { 1578cb14a3feSDimitry Andric return __lhs.swap(__rhs); 1579cb14a3feSDimitry Andric} 15800b57cec5SDimitry Andric 15810b57cec5SDimitry Andrictemplate <class... _Types> 1582cb14a3feSDimitry Andricstruct _LIBCPP_TEMPLATE_VIS hash< __enable_hash_helper<variant<_Types...>, remove_const_t<_Types>...>> { 15830b57cec5SDimitry Andric using argument_type = variant<_Types...>; 15840b57cec5SDimitry Andric using result_type = size_t; 15850b57cec5SDimitry Andric 1586cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI result_type operator()(const argument_type& __v) const { 15870b57cec5SDimitry Andric using __variant_detail::__visitation::__variant; 15880b57cec5SDimitry Andric size_t __res = 15890b57cec5SDimitry Andric __v.valueless_by_exception() 15900b57cec5SDimitry Andric ? 299792458 // Random value chosen by the universe upon creation 15910b57cec5SDimitry Andric : __variant::__visit_alt( 15920b57cec5SDimitry Andric [](const auto& __alt) { 1593bdd1243dSDimitry Andric using __alt_type = __remove_cvref_t<decltype(__alt)>; 1594cb14a3feSDimitry Andric using __value_type = remove_const_t< typename __alt_type::__value_type>; 15950b57cec5SDimitry Andric return hash<__value_type>{}(__alt.__value); 15960b57cec5SDimitry Andric }, 15970b57cec5SDimitry Andric __v); 1598bdd1243dSDimitry Andric return std::__hash_combine(__res, hash<size_t>{}(__v.index())); 15990b57cec5SDimitry Andric } 16000b57cec5SDimitry Andric}; 16010b57cec5SDimitry Andric 1602fe6060f1SDimitry Andric// __unchecked_get is the same as std::get, except, it is UB to use it with the wrong 1603fe6060f1SDimitry Andric// type whereas std::get will throw or returning nullptr. This makes it faster than 1604fe6060f1SDimitry Andric// std::get. 1605fe6060f1SDimitry Andrictemplate <size_t _Ip, class _Vp> 1606cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr auto&& __unchecked_get(_Vp&& __v) noexcept { 1607fe6060f1SDimitry Andric using __variant_detail::__access::__variant; 16085f757f3fSDimitry Andric return __variant::__get_alt<_Ip>(std::forward<_Vp>(__v)).__value; 16090b57cec5SDimitry Andric} 1610fe6060f1SDimitry Andric 1611fe6060f1SDimitry Andrictemplate <class _Tp, class... _Types> 1612cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr auto&& __unchecked_get(const variant<_Types...>& __v) noexcept { 1613bdd1243dSDimitry Andric return std::__unchecked_get<__find_exactly_one_t<_Tp, _Types...>::value>(__v); 1614fe6060f1SDimitry Andric} 1615fe6060f1SDimitry Andric 1616fe6060f1SDimitry Andrictemplate <class _Tp, class... _Types> 1617cb14a3feSDimitry Andric_LIBCPP_HIDE_FROM_ABI constexpr auto&& __unchecked_get(variant<_Types...>& __v) noexcept { 1618bdd1243dSDimitry Andric return std::__unchecked_get<__find_exactly_one_t<_Tp, _Types...>::value>(__v); 1619fe6060f1SDimitry Andric} 16200b57cec5SDimitry Andric 162106c3fb27SDimitry Andric#endif // _LIBCPP_STD_VER >= 17 16220b57cec5SDimitry Andric 16230b57cec5SDimitry Andric_LIBCPP_END_NAMESPACE_STD 16240b57cec5SDimitry Andric 16250b57cec5SDimitry Andric_LIBCPP_POP_MACROS 16260b57cec5SDimitry Andric 1627bdd1243dSDimitry Andric#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 162806c3fb27SDimitry Andric# include <exception> 1629bdd1243dSDimitry Andric# include <type_traits> 1630bdd1243dSDimitry Andric# include <typeinfo> 1631bdd1243dSDimitry Andric# include <utility> 1632bdd1243dSDimitry Andric#endif 1633bdd1243dSDimitry Andric 16340b57cec5SDimitry Andric#endif // _LIBCPP_VARIANT 1635