From: Daniel Carrera <dcarrera@...>
Date: 2003-08-01T07:12:19+09:00
Subject: Re: Extracting a parent class

Oh, sorry.
In that case I don't imagine it's possible by default because in general 
there might not be an "obvious" way to turn class B into class A.

You should make a B#to_A method.

Cheers,
Daniel.

On Fri, Aug 01, 2003 at 07:09:07AM +0900, Michael Garriss wrote:
> Sorry...I should have been more clear.  While this works it does not 
> mantain the state.   I would like all the members of 'b' that are class 
> A members to be set in 'a'.
> 
> Daniel Carrera wrote:
> 
> >Answer:
> >a = b.class.superclass.new
> >
> >Why:
> >b.class == B
> >b.class.superclass == A
> >b.class.superclass.new == A.new
> >
> >Cheers,
> >Daniel.
> >
> >On Fri, Aug 01, 2003 at 06:53:01AM +0900, Michael Garriss wrote:
> > 
> >
> >>Sorry about the newbie question but....
> >>
> >>class A
> >>attr_accessor :a
> >>end
> >>
> >>class B < A
> >>attr_accessor :b
> >>end
> >>
> >>b = B.new
> >>b.a = "some data"
> >>b.b = "some more data"
> >>a = b.?????
> >>
> >>How do I set 'a' from 'b' so that a is of class A and not class B?  I 
> >>don't want the extra info, I want just the subset of members found in 
> >>the parent class.  Is there a way to cast?
> >>
> >>TIA
> >>Michael Garriss
> >>
> >>   
> >>
> >
> > 
> >
> 
> 

-- 
Daniel Carrera | PGP: 6643 8C8B 3522 66CB D16C D779 2FDD 7DAC 9AF7 7A88
Math PhD. UMD  | http://www.math.umd.edu/~dcarrera/pgp.html

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