Best Practices for Using C++ std::vector Iterators

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

When using std::vector iterators, it's important to ensure that the vector is not modified while iterating. This can lead to undefined behavior.

Can you explain why modifying the vector during iteration is problematic?

Modifying the vector can invalidate the iterators, meaning they may point to invalid memory locations, which can cause crashes or unexpected results.

What are some safe ways to iterate over a vector?

You can use range-based for loops, or store the results in a separate container if you need to modify the original vector.

Are there any performance considerations I should keep in mind?

Yes, using iterators is generally efficient, but be cautious with operations that may cause reallocations, as they can be costly.