Torsten Rüger
d901c6f27c
seems more appropriate, as it is the class for a single object Also seems to be called that on the net (don't remember where the meta came from, but it's gone)
64 lines
1.6 KiB
Ruby
64 lines
1.6 KiB
Ruby
#
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# In many respects a SingletonClass is like a Class. We haven't gone to the full ruby/oo level
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# yet, where the singleton_class is actually a class instance, but someday.
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# A Class in general can be viewed as a way to generate methods for a group of objects.
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# A SingletonClass serves the same function, but just for one object, the class object that it
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# is the singleton_class of.
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# This is slightly different in the way that the type of the class must actually
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# change, whereas for a class the instance type changes and only objects generated
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# henceafter have a different type.
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# Another current difference is that a singleton_class has no superclass. Also no name.
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# There is a one to one relationship between a class instance and it's singleton_class instance.
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module Parfait
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class SingletonClass < Behaviour
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attr_reader :clazz
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def self.type_length
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4
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end
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def self.memory_size
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8
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end
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def initialize( clazz , clazz_type)
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raise "No type for #{clazz.name}" unless clazz_type
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super( clazz_type )
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@clazz = clazz
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end
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def rxf_reference_name
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@clazz.name
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end
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def inspect
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"SingletonClass(#{@clazz.name})"
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end
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def to_s
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inspect
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end
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# adding an instance changes the instance_type to include that variable
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def add_instance_variable( name , type)
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super(name,type)
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@clazz.set_type(@instance_type)
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end
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# Nil name means no superclass, and so nil returned
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def super_class
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return nil
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end
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# no superclass, return nil to signal
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def super_class_name
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nil
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end
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end
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end
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