From: Sean O'Halpin <sean.ohalpin@...>
Date: 2006-07-25T08:19:49+09:00
Subject: Re: Object to which a meta class belongs?

On 7/24/06, Erik Veenstra <erikveen@gmail.com> wrote:
> If a singleton class belongs to an object, it should be
> possible to determine to which object it belongs. Is that
> possible?
>
> I came up with the code below, but it might not be very fast.
>
> Thanks.
>
> gegroet,
> Erik V. - http://www.erikveen.dds.nl/
>
> ----------------------------------------------------------------
>
>  class Object
>    def metaclass
>      obj = self
>
>      class << self
>        self
>      end.instance_eval do
>        instance_eval <<-END
>          def belongs_to
>            ObjectSpace._id2ref(#{obj.__id__})
>          end
>        END
>
>        self
>      end
>    end
>  end
>
>  a       = "TEST"
>
>  p a.__id__
>  p a.metaclass.belongs_to.__id__
>
> ----------------------------------------------------------------
>
>
>

How about this?

class Object
  def singleton_of
    ObjectSpace.each_object(self) do |obj|
      return obj
    end
  end
end

Regards,
Sean