From: "ara.t.howard" <ara.t.howard@...>
Date: 2007-10-09T13:50:43+09:00
Subject: Re: The Open-Closed-from-a-certain-angle Principle


On Oct 8, 2007, at 10:10 PM, Jay Levitt wrote:

> What if class definitions were viewed through a magic prism, where  
> only
> those classes looking from the right perspective saw the new  
> extensions?

it's not too hard to imagine something like that:

cfp:~ > cat a.rb
module Namespace
   class File < ::File
     def self.xopen *a, &b
       open *a, &b
     end
   end

   def self.eval(&b) module_eval(&b) end
end

module Namespace
   File.xopen __FILE__ do |fd|
     puts fd.gets.scan(%r/\w+/).last
   end
end


cfp:~ > ruby a.rb
Namespace


cheers.

a @ http://codeforpeople.com/
--
it is not enough to be compassionate.  you must act.
h.h. the 14th dalai lama