Hmm.  Would it be possible to include a more complete example (even if
it doesn't compile)--that is, one where the visitor actually performs
real work?  My suspicion is that you would be better off *not*
encoding this visitor pattern using objects, but since I'm not clear
on how you intend to use it, I can't give a concrete example.  (And
likewise even if objects are the best choice.)

John.