From: Bertram Scharpf <lists@...>
Date: 2009-07-05T00:26:30+09:00
Subject: Re: How to remove/delete/destroy class variable in Ruby 1.9?

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

Bertram


-- 
Bertram Scharpf
Stuttgart, Deutschland/Germany
http://www.bertram-scharpf.de