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12 lines
364 B
Ruby
12 lines
364 B
Ruby
#derived from http://ola-bini.blogspot.com/2007/07/objectspace-to-have-or-not-to-have.html
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module SubclassTracking
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def self.extended(klazz)
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(class <<klazz; self; end).send :attr_accessor, :subclasses
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(class <<klazz; self; end).send :define_method, :inherited do |clzz|
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klazz.subclasses << clzz
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super
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end
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klazz.subclasses = []
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end
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end
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