From: "Iñaki Baz Castillo" <ibc@...>
Date: 2011-07-29T18:27:02+09:00
Subject: class variables in modules, annoying

Hi, let me show the following code:

--------------------------
module M
  @@var="M"

  def var
    @@var
  end

  def self.var
    @@var
  end
end


class A
  include M

  def var= v
     @@var=v
  end
end



a=A.new

a.var
=> "M"

a.var="A"
=> "A"

M.var
=> "A"
--------------------------


WHY is @@var replaced within M module? I do know that this behaviour
exists when inheriting classes, so a children class shares the class
variables of its parent class (which is a documented but undesirable
feature of Ruby). But I didn't expect it to occur using a module as
I'm not inheriting from a class.


In short, don't use class variables within a module, am I right?

Thanks a lot.



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