Benefits of using reserve() in a vector - C++

Question

What is the benefit of using reserve when dealing with vectors. When should I use them? Couldn\'t find a clear cut answer on this but I assume it is faster when you reserve

Answer 1

Don't know about people smarter than you, but I would say that you should call reserve in advance if you are going to perform lots in insertion operations and you already know or can estimate the total number of elements, at least the order of magnitude. It can save you a lot of reallocations in good circumstances.