Iterator straw-man

[Benji Smith]

Bill Baxter wrote:
> I'm guessing the specially-ordained iterator method names will probably 
> end up being opIter and opIterReverse (or maybe same with 'Iterator' 
> spelled out) just following the pattern established so far.

Why the continued assumption that there are only two valid kinds of 
iterator? A hashtable might have forward and reverse iterators for both 
its keys and its values, thereby requiring four distinct iterators. A 
tree might have depth-first, breadth-first, in-order, and reverse-order 
iterators. Any collection class might have a random-order iterator. I 
think it's awfully presumptuous to bake the notion of forward and 
reverse iteration directly into the language.

--benji