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29 lines
562 B
Ruby
29 lines
562 B
Ruby
# This file contains the Ruby code from book of
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# "Data Structures and Algorithms
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# with Object-Oriented Design Patterns in Ruby"
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# by Bruno R. Preiss.
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#
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# Copyright (c) 2004 by Bruno R. Preiss, P.Eng. All rights reserved.
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class AbstractObject < ::Object
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def initialize
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super
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end
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include ::Comparable
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def <=>(obj)
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if is_a?(obj.type)
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return compareTo(obj)
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elsif obj.is_a?(type)
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return -obj.compareTo(self)
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else
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return type.name <=> obj.type.name
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end
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end
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abstractmethod :compareTo
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protected :compareTo
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end |