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Showing content from https://cplusplus.com/reference/array/array/tuple_size/ below:

class template specialization

<array>

std::tuple_size<array>

template <class Tpl> class tuple_size;     // unspecializedtemplate <class T, size_t N>  struct tuple_size< array<T,N> >;         // array specialization

Tuple size traits for array

Accesses the size of an array object as if it was a tuple.

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template <class Tpl> class tuple_size;
template <class T, size_t N>
  struct tuple_size< array<T,N> > : integral_constant <size_t,N> {};

See tuple_size for more information.

Template parameters

Tpl: Type for which the size is to be obtained: array<T,N>.
T: Type of the elements contained.
N: Size of the array, in terms of number of elements.
Aliased as member value.
size_t is an unsigned integral type.

Member contants member constant definition value N (the size of the array).
This is a constexpr value of the unsigned integral type size_t.
See also

tuple_size: Tuple size traits (class template)

tuple_element<array>: Tuple element type for array (class template specialization)

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