Best way to return list of objects in C++?

Question

It\'s been a while since I programmed in C++, and after coming from python, I feel soooo in a straight jacket, ok I\'m not gonna rant.

I have a couple of functions that

Answer 1

I'd use the generic approach:

template 
void DoMagic(InIt first, InIt last, OutIt out)
{
  for(; first != last; ++first) {
    if(IsCorrectIngredient(*first)) {
      *out = DoMoreMagic(*first);
      ++out;
    }
  }
}

Now you can call it

std::vector ingredients;
std::vector result;

DoMagic(ingredients.begin(), ingredients.end(), std::back_inserter(results));

You can easily change containers used without changing the algorithm used, also it is efficient there's no overhead in returning containers.