From: 7stud -- <bbxx789_05ss@...>
Date: 2011-05-08T12:34:20+09:00
Subject: Re: Question regarding interaction between modules and classes

Geometric Patterns wrote in post #997317:
> Hi,

Don't EVER use global variables($).


module Foo
   def setup
      id = self.object_id
      puts id

      self.class.class_eval do
         @foo=  id

         def self.foo
            @foo
         end
      end
  end

   def foo
      return self.class.foo
   end
end

class Bar
   include Foo
end

bar_one = Bar.new
bar_one.setup
p bar_one.foo  # => 2148224640

bar_two = Bar.new
p bar_two.foo  # => warning: instance variable @foo not initialized

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