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

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

When using std::vector iterators, it's important to ensure that you don't invalidate them by modifying the vector. Always check the size before accessing elements.

Can you explain what iterator invalidation means?

Iterator invalidation occurs when the underlying container is modified, such as adding or removing elements, which can make existing iterators point to invalid memory.

What should I do if I need to modify a vector while iterating over it?

If you need to modify a vector while iterating, consider using a loop that iterates backwards or use the std::remove_if algorithm to safely remove elements.

Are there any performance considerations I should keep in mind?

Yes, using iterators can improve performance by avoiding unnecessary copies. However, be mindful of the complexity of operations like insertion and deletion.