What are iterators in C++ standard library?

What are iterators in the C++ standard library?

Iterators are objects that allow you to traverse through the elements of a container in C++. They provide a way to access elements without exposing the underlying structure.

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

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

#include <iostream>
#include <vector>

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 << " ";
    }
    return 0;
}

What are the different types of iterators available?

The C++ standard library provides several types of iterators:

1. Input Iterators
2. Output Iterators
3. Forward Iterators
4. Bidirectional Iterators
5. Random Access Iterators.

How do iterators differ from pointers?

While iterators can behave like pointers, they are more abstract. Iterators can work with various container types, while pointers are specific to arrays and memory addresses.