From: Pit Capitain <pit@...>
Date: 2007-03-06T17:07:11+09:00
Subject: Re: nifty one-liner to search ObjectSpace?

Giles Bowkett schrieb:
> Say I've got a class and I know it has subclasses. I'm absolutely sure
> there must be an irb ObjectSpace one-liner to give me all the
> subclasses of an arbitrary class.
> (...)
> I know it exists. I just don't know what it is. I'm also kind of
> stymied because it appears ObjectSpace has #each_object but not #each.
> That seems so weird to me.

Giles, here's something for both of your wishes:

   require "enumerator"

   s = Exception  # substitute with your superclass
   puts ObjectSpace.to_enum(:each_object, class<<s; self; end).to_a

Note that you can replace "to_a" with any method of Enumerable.

Regards,
Pit