NAME¶

std::tuple_size(std::array) - std::tuple_size(std::array)

Synopsis¶

Defined in header <array>
template< class T, std::size_t N >

struct tuple_size< std::array<T, N> > : (since C++11)
std::integral_constant<std::size_t, N>

{ };

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

Inherited from std::integral_constant

Member constants¶

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

Member functions¶

operator std::size_t converts the object to std::size_t, returns value
(public member function)
operator() returns value
(C++14) (public member function)

Member types¶

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

Example¶

// Run this code

#include <iostream>
#include <array>

template<class T>
void test(T)
{
int a[std::tuple_size<T>::value]; // can be used at compile time
std::cout << std::size(a) << '\n';
}

int main()
{
std::array<float, 3> arr;
test(arr);
}