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Groups > comp.lang.ruby > #4109

Re: Question regarding interaction between modules and classes

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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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Question regarding interaction between modules and classes Geometric Patterns <geometric.patterns@gmail.com> - 2011-05-07 22:02 -0500
  Re: Question regarding interaction between modules and classes Josh Cheek <josh.cheek@gmail.com> - 2011-05-07 22:31 -0500
  Re: Question regarding interaction between modules and classes 7stud -- <bbxx789_05ss@yahoo.com> - 2011-05-07 22:34 -0500

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