C++: Iterators vs Pointers

What are the main differences between iterators and pointers in C++?

Iterators are abstract representations of a position in a container, while pointers are direct memory addresses.

Can you give me an example of how to use an iterator?

Sure! Here's a simple example using a vector:

#include <vector>
#include <iostream>

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

This prints the elements of the vector.

Are there any advantages of using iterators over pointers?

Yes, iterators provide a level of abstraction that allows you to work with different container types without worrying about their underlying implementation.

What about performance? Are iterators slower than pointers?

In general, iterators are not slower than pointers. The performance is often comparable, but it can depend on the specific implementation of the iterator.