From: "Wolfgang Nádasi-Donner" <wonado@...>
Date: 2007-01-28T05:40:09+09:00
Subject: Re: instance variables available in derived clases

Avdi Grimm schrieb:
> To the contrary, it's not madness at all.  It's a legitimate
> interpretation of OO principles to say that a private member variable
> is private to a class, and should be inaccessible to all clients of
> the class - INCLUDING derived classes.

I think this not possible in Ruby in general, because onybody can change a class 
later.

It's normal practice to write code in Ruby, which changes classes of the 
standard library.

 >>>>> Example >>>>>

class Otto
   def show
     puts "here is 'show'"
   end
   private
   def hiddenshow
     puts "here is 'hiddenshow'"
   end
end

o = Otto.new
o.show
o.hiddenshow rescue puts '+++ cannot call hiddenshow'

class Otto
   public :hiddenshow
end

o.hiddenshow

 >>>>> Output >>>>>

here is 'show'
+++ cannot call hiddenshow
here is 'hiddenshow'

 >>>>> EoE >>>>>

Wolfgang N�dasi-Donner