From: David Vallner <david@...>
Date: 2005-12-03T18:45:54+09:00
Subject: Re: is there a way to get or list  all available classes?

A slightly more hackish solution I think that might also work with 
autoloads (way too early in the morning to go and code it), is to use 
#constants, eval those, select the ones that are classes, recurse, 
rinse, repeat. Mind you, this is potentially a much worse resource hog 
than the ObjectSpace approach.

David Vallner