What is std::deque in C++?

Can you explain what std::deque is in C++?

Sure! std::deque is a double-ended queue that allows fast insertion and deletion of elements from both ends.

How does std::deque differ from std::vector?

The main difference is that std::deque allows for efficient insertions and deletions at both ends, while std::vector is optimized for fast access and insertion at the end.

When should I use std::deque instead of std::vector?

You should use std::deque when you need to frequently add or remove elements from both ends, while std::vector is better for random access and when you mostly add/remove from the end.

Can you give me a code example of using std::deque?

Certainly! Here's a simple example:

#include <iostream>
#include <deque>

int main() {
    std::deque<int> d;
    d.push_back(1);
    d.push_front(2);
    std::cout << d.front() << ' ' << d.back(); // Outputs: 2 1
    return 0;
}