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 the appropriate iterator type, avoiding iterator invalidation, and utilizing 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 modify the container, or ensure that you reserve enough space before adding elements.

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, different types of iterators have varying performance characteristics. For example, random access iterators are generally faster than input or output iterators.