Implementing iterators for D custom data structures (best practices)

[Granville Barnett]

Hi All,

I've not used D for long so hopefully this question isn't too stupid...

Are there any best practices for implementing iterators in D? My 
understanding is that D follows a similar design approach to the STL RE 
containers - iterators - algs - adapters etc.

Also, are there any examples of well written data structures that expose 
iterators?...I recall that in D only arrays have them (I may be wrong, I 
haven't looked). Any open source projects that are notoriously well 
implemented?

Thanks in advance.

GB