list pop_back() function in C++ STL

The list::pop_back() is a built-in function in C++ STL which is used to remove an element from the back of a list container. That is, this function deletes the last element of a list container. This function thus decreases the size of the container by 1 as it deletes an element from the end of list.

Syntax:

list_name.pop_back();

Parameters: The function does not accept any parameter.

Return Value: This function does not returns anything.

Below program illustrate the list::pop_back() function in C++ STL:

// CPP program to illustrate the 
// list::pop_back() function 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // Creating a list 
    list<int> demoList; 
  
    // Adding elements to the list 
    // using push_back() 
    demoList.push_back(10); 
    demoList.push_back(20); 
    demoList.push_back(30); 
    demoList.push_back(40); 
  
    // Initial List: 
    cout << "Initial List: "; 
    for (auto itr = demoList.begin(); itr != demoList.end(); itr++) 
        cout << *itr << " "; 
  
    // removing an element from the end of List 
    // using pop_back 
    demoList.pop_back(); 
  
    // List after removing element from end 
    cout << "\n\nList after removing an element from end: "; 
    for (auto itr = demoList.begin(); itr != demoList.end(); itr++) 
        cout << *itr << " "; 
  
    return 0; 
} 

Output:

Initial List: 10 20 30 40 

List after removing an element from end: 10 20 30

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