Iterators sometimes require restructuring, as in http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html http://www.chiark.greenend.org.uk/~sgtatham/corout

Iterators sometimes require restructuring, as in http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html In Haskell they don't - you might write this "producer-consumer" composing a function that produces a stream with a function that consumes a stream. How would you approach that problem in C++?