This subclause describes the tuple library that provides a tuple type as the class template tuple that can be instantiated with any number of arguments. Each template argument specifies the type of an element in the tuple. Consequently, tuples are heterogeneous, fixed-size collections of values. An instantiation of tuple with two arguments is similar to an instantiation of pair with the same two arguments. See [pairs].
Header <tuple> synopsis
namespace std {
template <class... Types> class tuple;
const unspecified ignore;
template <class... Types>
constexpr tuple<VTypes...> make_tuple(Types&&...);
template <class... Types>
constexpr tuple<Types&&...> forward_as_tuple(Types&&...) noexcept;
template<class... Types>
constexpr tuple<Types&...> tie(Types&...) noexcept;
template <class... Tuples>
constexpr tuple<Ctypes...> tuple_cat(Tuples&&...);
template <class T> class tuple_size; template <class T> class tuple_size<const T>;
template <class T> class tuple_size<volatile T>;
template <class T> class tuple_size<const volatile T>;
template <class... Types> class tuple_size<tuple<Types...> >;
template <size_t I, class T> class tuple_element; template <size_t I, class T> class tuple_element<I, const T>;
template <size_t I, class T> class tuple_element<I, volatile T>;
template <size_t I, class T> class tuple_element<I, const volatile T>;
template <size_t I, class... Types> class tuple_element<I, tuple<Types...> >;
template <size_t I, class T>
using tuple_element_t = typename tuple_element<I, T>::type;
template <size_t I, class... Types>
constexpr tuple_element_t<I, tuple<Types...>>&
get(tuple<Types...>&) noexcept;
template <size_t I, class... Types>
constexpr tuple_element_t<I, tuple<Types...>>&&
get(tuple<Types...>&&) noexcept;
template <size_t I, class... Types>
constexpr const tuple_element_t<I, tuple<Types...>>&
get(const tuple<Types...>&) noexcept;
template <class T, class... Types>
constexpr T& get(tuple<Types...>& t) noexcept;
template <class T, class... Types>
constexpr T&& get(tuple<Types...>&& t) noexcept;
template <class T, class... Types>
constexpr const T& get(const tuple<Types...>& t) noexcept;
template<class... TTypes, class... UTypes>
constexpr bool operator==(const tuple<TTypes...>&, const tuple<UTypes...>&);
template<class... TTypes, class... UTypes>
constexpr bool operator<(const tuple<TTypes...>&, const tuple<UTypes...>&);
template<class... TTypes, class... UTypes>
constexpr bool operator!=(const tuple<TTypes...>&, const tuple<UTypes...>&);
template<class... TTypes, class... UTypes>
constexpr bool operator>(const tuple<TTypes...>&, const tuple<UTypes...>&);
template<class... TTypes, class... UTypes>
constexpr bool operator<=(const tuple<TTypes...>&, const tuple<UTypes...>&);
template<class... TTypes, class... UTypes>
constexpr bool operator>=(const tuple<TTypes...>&, const tuple<UTypes...>&);
template <class... Types, class Alloc>
struct uses_allocator<tuple<Types...>, Alloc>;
template <class... Types>
void swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(see below);
}
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