From: Daniel Waite <rabbitblue@...>
Date: 2007-10-26T06:16:59+09:00
Subject: Re: Need help understanding metaclassing

Chris Czub wrote:
> Daniel Waite wrote:
>> That's the same code as above. Still doesn't work though. =)
> 
> Nope, it's c.eat instead of cs.eat... works for me! :)

Hehe, I feel sheepish. (Yes, works for me, too.)

So... what I gather then is that it's possible to, from the viewpoint of 
the singleton, duck back into the object that spawned it. Why you would 
do that I don't know, but it can be done.

It looks like the only way to define a method on a singleton object is 
to use...

cs.instance_eval do
  def eat
    puts "You eat."
  end
end

I find that restrictive because you can't dynamically create a method 
name.

It looks likes you can extend it with modules:

module Bounce

  def bounce
    puts "You bounce."
  end

end

cs.extend Bounce
cs.bounce # You bounce.

What is special about the singleton object such that it cannot be 
extended using define_method?
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