#
# This file contains the Ruby code from Program 5.7 of
# "Data Structures and Algorithms
# with Object-Oriented Design Patterns in Ruby"
# by Bruno R. Preiss.
#
# Copyright (c) 2004 by Bruno R. Preiss, P.Eng.  All rights reserved.
#
# http://www.brpreiss.com/books/opus8/programs/pgm05_07.txt
#
class Visitor < AbstractObject

    abstractmethod :visit

    def done?
	false
    end

end