Namespaces
Variants

std::array<T,N>:: size

From cppreference.net

C++
Containers library
std::array
constexpr size_type size ( ) const noexcept ;
(since C++11)

Returns the number of elements in the container.

Contents

Return value

std:: distance ( begin ( ) , end ( ) )

Complexity

Constant.

Example

The following code uses size to display the number of elements in a std::array :

Run this code 
#include <array>
#include <iostream>
int main()
{ 
    std::array<int, 4> nums{1, 3, 5, 7};
    std::cout << "nums contains " << nums.size() << " elements.\n";
}

Output: 

nums contains 4 elements.

See also

checks whether the container is empty
(public member function)
returns the maximum possible number of elements
(public member function)
(C++17) (C++20)
returns the size of a container or array
(function template)