From: Gennady <gfb@...>
Date: 2003-02-22T07:46:24+09:00
Subject: Re: Style question: using 'block_given?'

It helps to keep in mind that classes in Ruby are objects as well (instances
of Class). So @data there is an instance variable of an object of type
Class. With all interesting consequences.

Gennady.

----- Original Message -----
From: "Brian Candler" <B.Candler@pobox.com>
To: "ruby-talk ML" <ruby-talk@ruby-lang.org>; <batsman.geo@yahoo.com>
Cc: "ruby-talk ML" <ruby-talk@ruby-lang.org>
Sent: Friday, February 21, 2003 2:39 PM
Subject: Re: Style question: using 'block_given?'


> > This is the class instance variable police. Freeze! Keine Bewegung!
> >
> > ;-)
>
> It's a fair cop :-) I had a hard time getting my head round this one:
>
> - Class variables (@@data) are fine.
>
> - Instance variables in a module are fine: mix it into a class, and
>   instances of that class get those instance variables too
>
> - But @data as a class instance variable? You can't even refer to it,
>   except from within a class method. (Unlike a class variable, @@data,
>   which you can use within a normal instance method)
>
> It looks like something which the language has by accident more than by
> design :-)
>
> Regards,
>
> Brian.
>
>