programming-examples/ruby/Data_Structures/abstract_object.rb
2019-11-15 12:59:38 +01:00

29 lines
562 B
Ruby

# This file contains the Ruby code from book 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.
class AbstractObject < ::Object
def initialize
super
end
include ::Comparable
def <=>(obj)
if is_a?(obj.type)
return compareTo(obj)
elsif obj.is_a?(type)
return -obj.compareTo(self)
else
return type.name <=> obj.type.name
end
end
abstractmethod :compareTo
protected :compareTo
end