std::tuple_size<std::array> - cppreference.com

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`template< class T, std::size_t N > struct tuple_size< std::array<T, N> > : std::integral_constant<std::size_t, N> { };`		(since C++11)

Provides access to the number of elements in an std::array as a compile-time constant expression.

`template< class T > constexpr std::size_t tuple_size_v = tuple_size<T>::value;`		(since C++17)

Inherited from std::integral_constant

N, the number of elements in the array
(public static member constant)

	converts the object to `std::size_t`, returns `value` (public member function)
	returns `value` (public member function)

Type	Definition
`value_type`	`std::size_t`
`type`	`std::integral_constant<std::size_t, value>`

#include <array>

int main()
{
    auto arr = std::to_array("ABBA");
    static_assert(std::tuple_size<decltype(arr)>{} == 5);
}