From: "T. Onoma" <transami@...>
Date: 2003-12-01T01:44:24+09:00
Subject: Re: Class-level readers and writers

On Sunday 30 November 2003 12:11 pm, David A. Black wrote:
> I don't think so.
>
> [...]
>
> > Or is that class local variable? Cause I'm not understand how @@a "will
> > behave like today's class instance variables without the need of  ``class
> > attribute accessors''."
>
> Matz's description is:
>
> * class variables will be local to the class/module
> * if you need to access class variables from outside,
>   define accessors
>
> (See <http://www.rubyist.net/~matz/slides/rc2003/mgp00020.html>.)
>
> So class vars will be able to do what they currently can't do, namely
> maintain state on a truly per-class basis (as opposed to
> per-hierarchy).  The difference between them and a class's instance
> variables, as I understand it, will be that the class variables are
> visible from instances of the class.

Thanks David,

I'm actually starting to get dizzy 8-o.  It would help, I think, if we lay 
this down cold for all to understand. Could you fix the following yummy 
class, to the best of your knowledge:

class ClassVariableSoup
  class_local_var                       # scope is ?
  def variables
    local_var                              # scope is method
    @class_instance_var             # scope is instance/ancestry
    @_local_class_instance_var   # scope is instance
    @@class_var                        # scope is class+instance/ancestry
    @@_local_class_var              # scope is class+instance
    # others ?
  end
  $global_var                             # scope if everywhere
end

Much Obliged,
-t0