Iterators for D

[KlausO]

Walter Bright wrote:
> 
> One such case is the usefulness of being able to provide an input 
> iterator to a parsing function, which may itself pass the iterator off 
> to other parsing functions.

Some questions:

Is your data structure a graph or a tree ?

What does your iterator iterating ?

I ask because I currently investigate the visitor pattern to traverse 
graph like data structures (see attached code for an example).

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