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

Can you explain how to use iterators with std::vector in C++?

Sure! In C++, iterators are used to traverse elements in a container like std::vector. You can use begin() and end() methods to get iterators.

Can you show me a simple example of using iterators with std::vector?

Absolutely! 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;
}

This code will print the elements of the vector.

What if I want to modify the elements while iterating?

You can modify elements by dereferencing the iterator. For example:

for (auto it = vec.begin(); it != vec.end(); ++it) {
    *it *= 2; // This will double each element
}

This will change the original vector.

Are there any other types of iterators I should know about?

Yes! Besides the basic iterator, there are reverse iterators, constant iterators, and more. Each serves different purposes.