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View visitor_manager.rb
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class Car < CarElement
def initialize
# Here we build an array of objects that will be visited. This can be done
# after initialize as well; it just needs to be built before calling 'accept'.
@elements = []
@elements << Wheel.new("front left")
@elements << Wheel.new("front right")
@elements << Wheel.new("back left")
@elements << Wheel.new("back right")
@elements << Body.new
@elements << Engine.new
end
 
# go through each element and 'visit' it
def accept(visitor)
@elements.each do |element|
element.accept(visitor)
end
visitor.visit(self)
end
end
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