From: "Mauricio Fernández" <batsman.geo@...>
Date: 2004-08-11T06:08:31+09:00
Subject: Re: Singleton class methods

On Wed, Aug 11, 2004 at 04:47:17AM +0900, Gennady wrote:
> That's kind of what I meant. It seems like when you do
> 
> class Foo
>   def self.bar
>   end
> end
> 
> method "bar" is added to the list of methods of the original class Foo.
> 
> On the other hand, for
> 
> class Foo
>   class << self
>     def bar
>     end
>   end
> end
> 
> a singleton class is created for class object "Foo" and method "bar" is 
> defined in that singleton class, with all consequences. Hence, the 
> difference in implementation.

Both create a singleton method, but the scoping is different.
See 
http://www.ruby-talk.com/blade/57274
and http://www.ruby-talk.com/cgi-bin/scat.rb/ruby/ruby-talk/57382

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