I remember hand-optimizing my code many years ago trying to re-use the same variable for many things, because it would be more efficient. I always think about t

I remember hand-optimizing my code many years ago trying to re-use the same variable for many things, because it would be more efficient. I always think about that when I see people avoiding std::vector or other C++ standard library things. Thankfully, as soon as people really understand how things are implemented they start using the standard libraries and suddenly become way more productive.