list size() function in C++ STL
The list::size() is a built-in function in C++ STL that is used to find the number of elements present in a list container. That is, it is used to find the size of the list container.
Time Complexity – Linear O(1) as per c++11 standard. Possible because the implementation maintains the size field.
Parameters: This function does not accept any parameter.
Return Value: This function returns the number of elements present in the list container list_name. Below program illustrate the list::size() function in C++ STL: