From: "Iñaki Baz Castillo" <ibc@...>
Date: 2009-12-19T11:13:54+09:00
Subject: Re: special cased?

El Sábado, 19 de Diciembre de 2009, Roger Pack escribió:
> This confused me a bit
> 
> class A
>  @a = 2
>  @@a = 3
>  def self.a
>    puts [@a, @@a]
>  end
> end
> 
> class B < A; end
> 
> A.a # [2, 3]
> B.a # [nil, 3]
> 
> shouldn't @a just lookup @@a in the parent?  Different treatment for
> different types of variables?

When you write:

  class A
    @a = 2

take into account that @a=2 is just parsed when loading class A for first 
time.
When you later do "class B < A; end", the Ruby interpreter doesn't read the 
line "@a = 2" again as it already parsed class A and just stored in memory the 
methods of class A.



-- 
Iñaki Baz Castillo <ibc@aliax.net>