C++ queue - pop() Function

The C++ queue::pop function is used to delete the first element of the queue. Every deletion of element results into reducing the container size by one unless the queue is empty.

Syntax

C++98
C++11

void pop();

void pop();

Parameters

No parameter is required.

Return Value

None.

Time Complexity

Constant i.e, Θ(1).

Example:

In the example below, the queue::pop function is used to delete first elements of the queue called MyQueue.

#include <iostream>
#include <queue>
using namespace std;
 
int main (){
  queue<int> MyQueue;

  MyQueue.push(10);
  MyQueue.push(20);
  MyQueue.push(30);
  MyQueue.push(40);
  MyQueue.push(50);

  //deletes first element of the queue
  MyQueue.pop();
  //deletes next first element of the queue
  MyQueue.pop();

  cout<<"MyQueue contains:";
  while (!MyQueue.empty()) {
    cout<<" "<<MyQueue.front();
    MyQueue.pop();
  }
  return 0;
}

The output of the above code will be:

MyQueue contains: 30 40 50

❮ C++ <queue> Library