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/* Copyright (C) 2019 Povilas Kanapickas <povilas@radix.lt>
This file is part of cppreference-doc
This work is licensed under the Creative Commons Attribution-ShareAlike 3.0
Unported License. To view a copy of this license, visit
http://creativecommons.org/licenses/by-sa/3.0/ or send a letter to Creative
Commons, 444 Castro Street, Suite 900, Mountain View, California, 94041, USA.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with no
Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
*/
#ifndef CPPREFERENCE_VARIANT_H
#define CPPREFERENCE_VARIANT_H
#if CPPREFERENCE_STDVER >= 2017
#include <exception> // exception
#include <functional> // hash
#include <utility> // in_place_type_t, ...
#include <type_traits>
#include <detail/cppreference_unspecified>
namespace std {
inline constexpr std::size_t variant_npos = static_cast<size_t>(-1);
struct monostate {};
class bad_variant_access : public exception {
public:
bad_variant_access();
~bad_variant_access() override;
const char * what() const override;
};
template<class... Types>
class variant; // forward declaration
template<size_t I, class T>
struct variant_alternative; // undefined
template<size_t I, class... Types>
struct variant_alternative<I, variant<Types...>> {
using type = CPPREFERENCE_SIMPLIFIED_TYPE;
};
template<size_t I, class... Types>
struct variant_alternative<I, const variant<Types...>> {
using type = CPPREFERENCE_SIMPLIFIED_TYPE;
};
template<size_t I, class... Types>
struct variant_alternative<I, volatile variant<Types...>> {
using type = CPPREFERENCE_SIMPLIFIED_TYPE;
};
template<size_t I, class... Types>
struct variant_alternative<I, const volatile variant<Types...>> {
using type = CPPREFERENCE_SIMPLIFIED_TYPE;
};
template <size_t I, class T>
using variant_alternative_t = typename variant_alternative<I, T>::type;
template<class... Types>
class variant {
public:
constexpr variant();
constexpr variant(const variant& other);
constexpr variant(variant&& other);
template<class T>
constexpr variant(T&& t);
template<class T, class... Args>
constexpr explicit variant(in_place_type_t<T>, Args&&... args);
template<class T, class U, class... Args>
constexpr explicit variant(in_place_type_t<T>,
initializer_list<U> il, Args&&... args);
template<size_t I, class... Args>
constexpr explicit variant(in_place_index_t<I>, Args&&... args);
template<size_t I, class U, class... Args>
constexpr explicit variant(in_place_index_t<I>,
initializer_list<U> il, Args&&... args);
~variant();
constexpr variant& operator=(const variant& rhs);
constexpr variant& operator=(variant&& rhs);
template<class T>
variant& operator=(T&& t);
constexpr size_t index() const;
constexpr bool valueless_by_exception() const;
template <class T, class... Args>
T& emplace(Args&&... args);
template <class T, class U, class... Args>
T& emplace(initializer_list<U> il, Args&&... args);
template <size_t I, class... Args>
variant_alternative_t<I, variant>& emplace(Args&&... args);
template <size_t I, class U, class... Args>
variant_alternative_t<I, variant>&
emplace(initializer_list<U> il, Args&&... args);
void swap(variant& rhs);
};
template<class... Types>
constexpr bool operator==(const variant<Types...>& v, const variant<Types...>& w);
template<class... Types>
constexpr bool operator!=(const variant<Types...>& v, const variant<Types...>& w);
template<class... Types>
constexpr bool operator<(const variant<Types...>& v, const variant<Types...>& w);
template<class... Types>
constexpr bool operator>(const variant<Types...>& v, const variant<Types...>& w);
template<class... Types>
constexpr bool operator<=(const variant<Types...>& v, const variant<Types...>& w);
template<class... Types>
constexpr bool operator>=(const variant<Types...>& v, const variant<Types...>& w);
template <class... Types>
void swap(variant<Types...>& lhs, variant<Types...>& rhs);
template<class Visitor, class... Variants>
constexpr CPPREFERENCE_SIMPLIFIED_TYPE visit(Visitor&& vis, Variants&&... vars);
template <class R, class Visitor, class... Variants>
constexpr R visit(Visitor&&, Variants&&...);
template <class T, class... Types>
constexpr bool holds_alternative(const variant<Types...>& v);
template<size_t I, class... Types>
constexpr variant_alternative_t<I, variant<Types...>>&
get(variant<Types...>& v);
template<size_t I, class... Types>
constexpr variant_alternative_t<I, variant<Types...>>&&
get(variant<Types...>&& v);
template<size_t I, class... Types>
constexpr const variant_alternative_t<I, variant<Types...>>&
get(const variant<Types...>& v);
template<size_t I, class... Types>
constexpr const variant_alternative_t<I, variant<Types...>>&
get(const variant<Types...>&& v);
template<class T, class... Types>
constexpr T& get(variant<Types...>& v);
template<class T, class... Types>
constexpr T&& get(variant<Types...>&& v);
template<class T, class... Types>
constexpr const T& get(const variant<Types...>& v);
template<class T, class... Types>
constexpr const T&& get(const variant<Types...>&& v);
template <size_t I, class... Types>
constexpr add_pointer_t<variant_alternative_t<I, variant<Types...>>>
get_if(variant<Types...>* pv);
template <size_t I, class... Types>
constexpr add_pointer_t<const variant_alternative_t<I, variant<Types...>>>
get_if(const variant<Types...>* pv);
template <class T, class... Types>
constexpr add_pointer_t<T> get_if(variant<Types...>* pv);
template <class T, class... Types>
constexpr add_pointer_t<const T> get_if(const variant<Types...>* pv);
template<class T>
struct variant_size; // undefined
template<class... Types>
struct variant_size<variant<Types...>> :
integral_constant<size_t, sizeof...(Types)> {
};
template<class... Types>
struct variant_size<const variant<Types...>> :
integral_constant<size_t, sizeof...(Types)> {
};
template<class... Types>
struct variant_size<volatile variant<Types...>> :
integral_constant<size_t, sizeof...(Types)> {
};
template<class... Types>
struct variant_size<const volatile variant<Types...>> :
integral_constant<size_t, sizeof...(Types)> {
};
template <class... Types>
struct hash<variant<Types...>> {};
} // namespace std
#endif // CPPREFERENCE_STDVER >= 2017
#endif // CPPREFERENCE_VARIANT_H