What are the best practices for using iterators in C++?

What are the best practices for using iterators in C++?

Some best practices include using standard library iterators, avoiding iterator invalidation, and using range-based for loops.

Can you explain iterator invalidation?

Iterator invalidation occurs when the underlying container is modified, which can lead to undefined behavior if the iterator is used afterward.

How can I avoid iterator invalidation?

To avoid invalidation, you can use methods that do not change the size of the container, like push_back on vectors, or ensure you reserve space beforehand.

What are range-based for loops?

Range-based for loops allow you to iterate over elements in a container without explicitly using iterators, making the code cleaner and safer.

Are there any performance considerations with iterators?

Yes, using iterators can sometimes introduce overhead, especially with complex data structures. It's important to choose the right type of iterator for your needs.