From: Daniel Lucraft <dan@...>
Date: 2007-05-02T00:49:36+09:00
Subject: Re: simple subclass question

Ball, Donald A Jr (Library) wrote:
> If I want a class and its children to have different values for the same
> class variables, how would I go about making that happen?
> 
> - donald

Instead of:

class A
  def A.var=(v)
    @@var = v
  end
  def A.var
    @@var
  end
end

class B < A
end

where A and B will share the class variable, use a class instance 
variable instead:

class A
  def A.var=(v)
    @var = v
  end
  def A.var
    @var
  end
end

class B < A
end

where A and B will have different class instance variables.

You can use the attr_accessor notation to create class instance variable 
getters and setters like this:

class A
  class << self
    attr_accessor :var
  end
end

best,
Dan

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