C++: Iterator vs Pointer

What is the difference between an iterator and a pointer in C++?

In C++, both iterators and pointers can be used to traverse data structures, but they have key differences. Pointers are variables that hold memory addresses, while iterators are objects that provide a way to access elements in a container without exposing the underlying structure.

Can you give me an example of when to use an iterator instead of a pointer?

Sure! Use iterators when working with STL containers like vectors or lists. They provide a uniform way to traverse elements, and they can work with different types of containers without needing to know their internal structure.

Are there any performance differences between using iterators and pointers?

Generally, iterators and pointers have similar performance, but iterators can introduce some overhead due to their abstraction. However, the difference is often negligible, and iterators offer more safety and flexibility.

What about the syntax? Is it different?

Yes, the syntax can differ. For example, you use *it to dereference an iterator, similar to a pointer, but iterators often have additional member functions like ++it for incrementing, which can be more intuitive.