From: Robert Dober <robert.dober@...>
Date: 2006-06-22T01:51:17+09:00
Subject: Re: Achieve pure object oriented design in Ruby

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On 6/21/06, gwtmp01@mac.com <gwtmp01@mac.com> wrote:
>
>
> On Jun 20, 2006, at 6:02 PM, Robert Dober wrote:
> > The real problem is  requirement 2) of the OP,  instanciation of
> > class B
> > shall only be possible in class A, e.g. in an instance of A, I do
> > not think
> > this is possible, but I would not bet on it (not much).
>
> Why not just make B an anonymous class:
>
> class A
>    def initialize
>      @bclass =3D Class.new do
>        # class definition here
>      end
>      @bs =3D []
>    end
>
>    def another_b_please
>       @bs << @bclass.new
>       @bs.last
>    end
> end


Gary that is what I did, and discussed above. ( I used an anonymous class
inside A, you use one inside an instance of A, which might be quite
disturbing unless A is a singleton itself!!)

One can create an accessor to @b at any time

class A
   attr_accessor :bclass
end
A.new.bclass.new  #voil=E0

cheers
Robert

> Gary Wright
>
>
>
>
>


--=20
Deux choses sont infinies : l'univers et la b=EAtise humaine ; en ce qui
concerne l'univers, je n'en ai pas acquis la certitude absolue.

- Albert Einstein

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