How do C++ iterators work in different containers?

Can you explain how iterators work in C++ for different containers?

Sure! In C++, iterators are used to traverse elements in containers like vectors, lists, and maps. Each container has its own iterator type.

What are the main types of iterators in C++?

The main types of iterators are input iterators, output iterators, forward iterators, bidirectional iterators, and random access iterators.

How do I use an iterator with a vector?

You can use a vector's iterator by calling begin() and end() methods. For example:

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

Are there any differences in using iterators with lists compared to vectors?

Yes, lists are implemented as doubly linked lists, so their iterators are bidirectional. You can only move forward and backward, while vectors allow random access.