David Megginson david at
Tue Jun 22 14:33:01 BST 1999

Rick Jelliffe writes:

 > Non-imaginary sheep are counted with the aid of a non-imaginary
 > sheep dog to keep them in line. Q. Is a sheep dog therefore an
 > instance of the Visitor pattern?

I'd guess that the sheep dog is the implementation of a queue, the
sheep are the queue's members, and the shepherd who is counting the
sheep is the visitor.

All the best,


p.s. I own a Border Collie but no sheep.  My frisbies are kept in a
     good line, though.

David Megginson                 david at

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