From: "David A. Black" <dblack@...>
Date: 2009-07-05T09:07:38+09:00
Subject: Re: How to remove/delete/destroy class variable in Ruby 1.9?

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

-- 
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