[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;
  };

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;

Returns: A reference to the

I {th element of a, where indexing is zero-based .}^{th element of a, where indexing is zero-based .}

23 Containers library [containers]

23.3 Sequence containers [sequences]

23.3.3 Class template array [array]

23.3.3.7 Tuple interface [array.tuple]