Hi, I've been writing a type for recursive tree structures, and several types that traverse that tree in various manners like breadth first or depth first. They have their own methods for getting the current tree node, moving to the next node, whether an end has been reached and so on. The contain fields for the nodes several steps ahead, those past etc. I wondered if I might make it so as these types might easier be used in loops by giving them the iterator protocol methods? I've not seen how to define custom operators, is it as simple as defining start next and done? How is the current value gotten? I guess its returned by next().
Thanks, Ben.
