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list size() function in C++ STL
In this article we will be discussing the working, syntax and examples of list::size() function in C++.
What is a List in STL?
List is a data structure that allows constant time insertion and deletion anywhere in sequence. Lists are implemented as doubly linked lists. Lists allow non-contiguous memory allocation. List perform better insertion extraction and moving of element in any position in container than array,vector and deque. In List the direct access to the element is slow and list is similar to forward_list, but forward list objects are single linked lists and they can only be iterated forwards.
What is list::size()?
list::size() is an inbuilt function in C++ STL which is declared in <list> header file. size() returns the size of a particular list container. In other words it returns the number of elements which are present in a list container.
Syntax
list_container.size()
This function accepts no parameter.
Return Value
This function returns a size_type value i.e.number of elements in a list_container.
Example
In the below code we are calculating the size of the integer list which is the number of elements it contains using the function size().
#include <bits/stdc++.h>
using namespace std;
int main(){
//Create a list
list<int> myList;
//insert elements to the List
myList.push_back(23);
myList.push_back(12);
myList.push_back(21);
int size = myList.size();
cout << "size of the list is : "<<size;
return 0;
}Output
If we run the above code it will generate the following output
size of the list is : 3
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