From: Brian Candler <b.candler@...>
Date: 2008-11-19T18:55:16+09:00
Subject: Re: Is there a way to know what are the subclasses of a give

Sandro Paganotti wrote:
> Do you know if there's a trick to retrieve a list of all the subclasses 
> of a
> given class ?

Only this that I know of:

class A; end
class B<A; end

require 'enumerator'
p ObjectSpace.to_enum(:each_object, Class).
  select { |c| c.superclass == A }
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