From: dzw! <bartoszwais@...>
Date: 2009-07-05T20:20:06+09:00
Subject: Re: How to remove/delete/destroy class variable in Ruby 1.9?

On Jul 5, 10:07 am, "David A. Black" <dbl...@rubypal.com> wrote:
> Hi --
>
>
>
> On Sun, 5 Jul 2009, Bertram Scharpf wrote:
> > Hi,
>
> > Am Samstag, 04. Jul 2009, 23:40:32 +0900 schrieb David A. Black:
> >> On Sat, 4 Jul 2009, Bertram Scharpf wrote:
>
> >>>  class Object ; remove_class_variable "@@var" ; end
>
> >> I forgot all about that method. I guess I'm rusty on class variables,
> >> from lack of use :-)
>
> > I don't use them either. Sometimes I wonder about that because
> > a "@@var" is much shorter than a "MyClass.var". It seems to be
> > more disturbing you than simplifying your code. I did some weird
> > things like these:
>
> >  class C ; end
> >  C.class.instance_eval "@@x = 'X'"
> >  class <<C ; @@y = "Y" ; end
>
> > I gave up trying to understand it.
>
> > The easiest thing is when accessors look the same in classes and
> > in instances:
>
> >  class MyClass
> >    attr_accessor :iv     # @iv in MyClass.new
> >    class <<self
> >      attr_accessor :cv   # @cv in MyClass
> >    end
> >    @cv = "initial"
> >  end
>
> Yes; I definitely think it's a case where the "classes are objects
> too" thing makes it fall into place.
>
> David
>
> --
> David A. Black / Ruby Power and Light, LLC
> Ruby/Rails consulting & training:http://www.rubypal.com
> Now available: The Well-Grounded Rubyist (http://manning.com/black2)
> Training! Intro to Ruby, with Black & Kastner, September 14-17
> (More info:http://rubyurl.com/vmzN)

Thank you guys, all your tips were very useful.
 It was just dummy example(inspired from Pickaxe Book) that made me
thinking, remove_class_variable method was exactly what I looked for
[ I really cant believe I missed it :)).

and $$class_variable explanation works very well for my brain.


Big Cheers from Bart