< cpp‎ | container‎ | list
size_type size() const;

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


[edit] Parameters


[edit] Return value

The number of elements in the container.

[edit] Exceptions

(none) (until C++11)
noexcept specification:  
(since C++11)

[edit] Complexity

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

[edit] Example

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

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


nums contains 4 elements.

[edit] See also

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