comp.lang.ruby

T. Onoma

11/30/2003 4:44:00 PM

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/mgp0002....)
>
> 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