21 Metaprogramming library [meta]
21.2 Compile-time integer sequences [intseq]
template<class T, T.. Values>
struct tuple_size<integer_sequence<T, Values..>
: integral_constant<size_t, sizeof.(Values)> { };
template<size_t I, class T, T.. Values>
struct tuple_element<I, integer_sequence<T, Values..> {
using type = T;
};
template<size_t I, class T, T.. Values>
struct tuple_element<I, const integer_sequence<T, Values..> {
using type = T;
};
Mandates:
I < sizeof.(Values). template<size_t I, class T, T.. Values>
constexpr T get(integer_sequence<T, Values..>) noexcept;