Understanding C++ std::vector Iterators

Can you explain what std::vector iterators are in C++?

Sure! std::vector iterators are objects that allow you to traverse the elements of a std::vector. They provide a way to access and manipulate the elements in a vector without exposing the underlying data structure.

How do I use these iterators in a loop?

You can use iterators in a loop like this:

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

This will print all the elements in the vector.

What are the different types of iterators available for std::vector?

std::vector provides several types of iterators:

1. begin() and end() for forward iteration.
2. rbegin() and rend() for reverse iteration.
3. const_iterator for read-only access.

Can I modify the elements using iterators?

Yes, you can modify elements using non-const iterators. For example:

for (auto it = vec.begin(); it != vec.end(); ++it) {
    *it += 1; // Increment each element by 1
}