From: Robert Klemme <bob.news@...>
Date: 2005-11-11T02:17:14+09:00
Subject: Re: Golf, anyone?

m4dc4p wrote:
> I spent a day figuring out how to solve this problem, and it seems
> like there should be a much better solution. I wanted to write a
> module that, when included in an object, would create a class
> variable and accessor for that object. If another class includes the
> module, it should have its own class variable and accessor. The class
> variable does *not* live in the module - it is not shared by all
> objects which include the module.

Like this?

module Foo
  def self.included(cl)
    class <<cl
      attr_reader :prop
    end
    cl.class_eval { @prop = [] }
    def cl.inherited(cl2)
      cl2.class_eval { include Foo }
    end
  end
end
class Bar
  include Foo
end
Bar.prop << "a"
p Bar.prop
class Sub < Bar
end
class Sub2 < Sub
end
Sub.prop << "b"
p Sub.prop
Sub2.prop << "c"
p Sub2.prop

Kind regards

    robert