How to replicate map, filter and reduce behaviors in C++ using STL?

Question

I suppose we can use std::transform to replicate the map behavior in C++ like this :

std::vector in = { 1 , 2 , 3 ,4 }; 
std::vector out(i         


        

Answer 1

Depends which container you use.

std::back_inserter will work only if the container has a push_back function.

For example back_insterter can't be used with forward_list.

In that case we need to have the memory allocated before we call std::transform on the same and first approach is better.