fastest way to convert a std::vector to another std::vector

Question

What is the fastest way (if there is any other) to convert a std::vector from one datatype to another (with the idea to save space)? For example:

std::vector         


        

Answer 1

Copying element by element is not highly inefficient. std::vector provides constant access time to any of its elements, hence the operation will be O(n) overall. You will not notice it.