What are STL iterators in C++?

What are STL iterators in C++?

STL iterators are objects that allow you to traverse 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?

There are several types of iterators in C++:

1. Input Iterators
2. Output Iterators
3. Forward Iterators
4. Bidirectional Iterators
5. Random Access Iterators. Each type has its own capabilities and use cases.

How do iterators differ from pointers?

Iterators are abstract representations of pointers. While pointers can directly access memory, iterators provide a more flexible and safer way to traverse containers without exposing their internal structure.