std::array::size

constexpr size_type size();		(since C++11) (until C++14)
constexpr size_type size() const;		(since C++14)

Returns the number of elements in the container, i.e. std::distance(begin(), end()).

Parameters

(none).

Return value

The number of elements in the container.

Exceptions

noexcept specification:

noexcept

Complexity

Constant.

Example

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

#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.

empty	checks whether the container is empty (public member function)
max_size	returns the maximum possible number of elements (public member function)