From: "Kroeger, Simon (ext)" <simon.kroeger.ext@...>
Date: 2005-10-24T21:30:43+09:00
Subject: Re: How to find all the subclasses of a class?



> -----Original Message-----
> From: Sean O'Halpin [mailto:sean.ohalpin@gmail.com] 
> Sent: Monday, October 24, 2005 1:49 PM
> To: ruby-talk ML
> Subject: Re: How to find all the subclasses of a class?
> 
> Incorporating Robert's suggestions, this is a bit better:
> 
> class Module
>   def subclasses
>     classes = []
>     ObjectSpace.each_object(Module) do |m|
>       classes << m if m.ancestors.include? self
>     end
>     classes
>   end
> end
> 
> Regards,
> 
> Sean

prettyfied:

require 'enumerator'
class Module
  def subclasses
    ObjectSpace.to_enum(:each_object, Module).select do |m|
      m.ancestors.include?(self) 
    end
  end
end

cheers

Simon