23 Containers library [containers]

23.3 Sequence containers [sequences]

23.3.3 Class template array [array]

23.3.3.7 Tuple interface [array.tuple]

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template<class T, size_t N> struct tuple_size<array<T, N>> : integral_constant<size_t, N> { };
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template<size_t I, class T, size_t N> struct tuple_element<I, array<T, N>> { using type = T; };
1
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Mandates: I < N is true.
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template<size_t I, class T, size_t N> constexpr T& get(array<T, N>& a) noexcept; template<size_t I, class T, size_t N> constexpr T&& get(array<T, N>&& a) noexcept; template<size_t I, class T, size_t N> constexpr const T& get(const array<T, N>& a) noexcept; template<size_t I, class T, size_t N> constexpr const T&& get(const array<T, N>&& a) noexcept;
2
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Mandates: I < N is true.
3
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Returns: A reference to the element of a, where indexing is zero-based.