NAME¶

std::list::size - std::list::size

Synopsis¶

size_type size() const; (until C++11)
size_type size() const noexcept; (since C++11)

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.

Complexity¶

Constant or linear. (until C++11)
Constant. (since C++11)

Example¶

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

// Run this code

#include <list>
#include <iostream>

int main()
{
std::list<int> nums {1, 3, 5, 7};

std::cout << "nums contains " << nums.size() << " elements.\n";
}

Output:¶

nums contains 4 elements.

See also¶

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