From: Daniel Schierbeck <daniel.schierbeck@...>
Date: 2006-08-08T19:30:05+09:00
Subject: Re: Automatic instantiation of subclasses

Kilivor Kante wrote:
> Hi!
> 
> First sorry I am a beginner ;-( What I want to do is: automatically 
> instantiate subclasses of a given class, say, A.
> 
>   class A
>   end
> 
>   class A1 < A
>   end
> 
>   class A2 <A
>   end
> 
> So I want to know the names of A subclasses: A1 and A2. Then instantiate 
> via reflection. Is it possible?

   class Class
     def inherited(subclass)
       subclasses.push(subclass)
     end

     def subclasses
       @subclasses ||= []
     end
   end

   class A; end
   class B < A; end
   class C < A; end

   A.subclasses  => [B, C]
   instances = A.subclasses.map{|subclass| subclass.new }


Cheers,
Daniel