What are the best practices for using iterators with C++ vectors?

What are the best practices for using iterators with C++ vectors?

When using iterators with C++ vectors, it's important to ensure that you don't invalidate iterators by modifying the vector. Always prefer using range-based for loops when possible.

Can you explain why modifying the vector invalidates the iterators?

Modifying a vector, such as adding or removing elements, can change its size and memory allocation, which invalidates existing iterators.

What are some common mistakes to avoid when using iterators?

Common mistakes include dereferencing invalidated iterators, using iterators after the vector has been modified, and not checking for the end of the iterator.

Are there any performance considerations I should keep in mind?

Yes, using iterators can be more efficient than using indices, especially in algorithms. However, be cautious of iterator invalidation during modifications.