How do I use iterators with std::vector in C++?

How do I use iterators with std::vector in C++?

You can use iterators to traverse a std::vector. Here's a simple example:

#include <iostream>
#include <vector>

int main() {
    std::vector<int> vec = {1, 2, 3, 4, 5};
    for (auto it = vec.begin(); it != vec.end(); ++it) {
        std::cout << *it << ' ';
    }
    return 0;
}

What are the different types of iterators available for std::vector?

std::vector supports several types of iterators:

1. Random Access Iterators: Allow direct access to any element.
2. Const Iterators: Provide read-only access to elements.
3. Reverse Iterators: Traverse the vector in reverse order.

Can you explain how to use reverse iterators?

Sure! You can use reverse iterators with std::vector like this:

for (auto rit = vec.rbegin(); rit != vec.rend(); ++rit) {
    std::cout << *rit << ' ';
}

This will print the elements in reverse order.

What happens if I try to dereference an iterator that is out of bounds?

Dereferencing an out-of-bounds iterator leads to undefined behavior, which can cause your program to crash or produce incorrect results. Always ensure your iterators are valid before dereferencing.