From: Charles Oliver Nutter <headius@...>
Date: 2009-09-03T14:18:03+09:00
Subject: Re: Class#descendants?

On Wed, Aug 12, 2009 at 2:39 PM, Joel VanderWerf<vjoel@path.berkeley.edu> wrote:
> irb(main):001:0> ObjectSpace.each_object(Class) {|cl| p cl if cl < Numeric}
> Bignum
> Float
> Fixnum
> Integer
>
> But keep in mind: it's inefficient (so cache if you can), and it may not be
> standard across rubies (jruby may not have it IIRC). It's useful for
> interactive poking around though.

This is actually the one each_object case we do support with general
ObjectSpace support turned off, since we maintain a weak reference
from parent to child classes (so we just walk everything from Object
down; it's for our method-caching logic).

- Charlie