Remove from beginning of a vector in C++

This post will discuss how to remove from the beginning of a vector in C++.

1. Using `vector::erase`

The recommended solution to remove an element from a vector is using the vector::erase function. It takes an iterator to the element to be deleted. To remove an element from the beginning of a vector, pass an iterator to the first element in the vector. This is demonstrated below:

#include <iostream>

#include <vector>

int main()

{

std::vector<int> vec = {1, 2, 3, 4};

vec.erase(vec.begin());

for (int &i: vec) {

std::cout << i << ' ';

}

return 0;

}

Download Run Code

Output:

2 3 4

2. Using `std::deque`

A std::deque is preferred to add or remove elements from either end of a container. It implements a Double-ended queue that expands or shrinks on both ends. To remove an element from the beginning of the vector, use the pop_front member function of std::deque.

#include <iostream>

#include <deque>

int main()

{

std::deque<int> q = {1, 2, 3, 4};

q.pop_front();

for (int &i: q) {

std::cout << i << ' ';

}

return 0;

}

Download Run Code

Output:

2 3 4

That’s all about removing from the beginning of a vector in C++.

Remove from beginning of a vector in C++

1. Using vector::erase

2. Using std::deque

Share this:

1. Using `vector::erase`

2. Using `std::deque`