C++ pop_front()

The pop_front() method in C++ deque removes or pops the first (front) element from the deque, reducing its size by one.

Syntax

deque_name.pop_front();

Parameters:

This method does not take any parameters.

Return value:

pop_front() does not return anything and removes the first element from the deque

Example

In this example, the first element of an integer deque is removed, and the updated deque is printed:

#include <iostream>
#include <deque>
using namespace std;

int main() {
  deque<int> numbers = {10, 20, 30, 40};

  // Remove the first element
  numbers.pop_front(); // Removes 10

  cout << "Deque after pop_front(): ";
  for (int num : numbers) {
    cout << num << " ";
  }

  return 0;
}

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The output of this code is:

Deque after pop_front(): 20 30 40

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Codebyte Example

In this example, the first element of a string deque is removed, and the new front element is displayed:

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