From: Manoj Kumar <manojs.nitt@...>
Date: 2010-06-27T22:43:32+09:00
Subject: Re: Singleton class in Ruby

Jes炭s Gabriel y Gal叩n wrote:
> On Fri, Jun 25, 2010 at 6:11 AM, Manoj Kumar <manojs.nitt@gmail.com> 
> wrote:
>> Can we see the singleton class as object in ruby.
> 
> Like this?
> 
> irb(main):001:0> o = Object.new
> => #<Object:0xb743f3fc>
> irb(main):002:0> singleton = class << o; self; end
> => #<Class:#<Object:0xb743f3fc>>
> irb(main):003:0> singleton
> => #<Class:#<Object:0xb743f3fc>>
> irb(main):004:0> def o.test; "test"; end
> => nil
> irb(main):008:0> singleton.instance_methods(false)
> => ["test"]
> 
> Jesus.

As you said   class << o; self; end

In Rails, there is a method called metaclass which is defined in Object

def metaclass
  class << self
    self
  end
end

is #<Class:#<Object:0xb743f3fc>> the singleton class object for object 
o?
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