From: "Jan E." <lists@...>
Date: 2012-06-10T10:39:58+09:00
Subject: Re: Accessing Variables from Within a Module

Doug Jolley wrote in post #1063908:
> Suggestions?  I'm wide open.  Thanks for the input.

From the description I'm guessing you want to use the module as a mixin 
to add methods to the class. In this case you don't even need the 
accessor methods. If you include the module in the class, the methods of 
the module have direct access to the instance variables -- just like 
they were defined in the class.

As an example:

#------
module M

  def mod_show
    puts "Value of @x: #{@x}"
  end

end

class C

  include M

  def initialize
    @x = 123
  end

end

c = C.new
c.mod_show
#------


However, letting others edit parts of the code is a pretty odd way of 
extending functionalities. In object oriented languages (like Ruby), the 
standard way to do this is via inheritance: You derive a new class from 
an old one and extend it to your needs.

Some languages like Java also let the programmer prevent methods from 
being changed in subclasses (what you want to do). But Ruby is very 
dynamic and not so much aimed at making code unchangeable.

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