Is there a more efficient way to set a std::vector from a stream?

Question

Presently, I set the value of a std::vector from an std::ostringstream as follows:

void
foo(std::vector &am         


        

Answer 1

if there is a more efficient way

You may want to call reserve on your data and use the range insert member directly on data instead of using a copy-assignment. The thing about vectors that you need to remember is that every node may potentially increase the size (and relocate all elements). So, you're better off allocating the memory in one go (if you know how many objects you will be storing -- which you do know here) and leverage this fact.