The list::pop_front() is a built-in function in C++ STL which is used to remove an element from the front of a list container. This function thus decreases the size of the container by 1 as it deletes the element from the front of a list.
Syntax:
list_name.pop_front();
Parameters: The function does not accept any parameter.
Return Value: This function does not returns anything.
Below program illustrate the list::pop_front() function in C++ STL:
// CPP program to illustrate the // list::pop_front() 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 front of List // using pop_front demoList.pop_front(); // List after removing element from front cout << "
List after removing an element from front: "; 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 front: 20 30 40
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