From: "David A. Black" <dblack@...>
Date: 2007-05-02T08:26:54+09:00
Subject: Re: simple subclass question

Hi --

On 5/1/07, Ball, Donald A Jr (Library) <donald.ball@nashville.gov> wrote:
> Thanks to you and Robert for the quick answers. I think I get it now; I
> was a little fuzzy on the notion of class instance variables before. I
> now use a construct like so:
>
> class A
>   class << self
>     attr_accessor :var
>   end
> end
>
> class B < A
>   class << self
>     def var
>       @var || superclass.var
>     end
>   end
> end
>
> to allow subclasses's instance variables to default to their
> superclass's until and unless overridden. I'll admit the class << self
> syntax continues to mystify somewhat; can anyone proffer an explanation
> that would help me grok it fully?

Possibly; have a look at: http://www.rubypal.com/singletons.html


David

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