From: "Nigel S.Ball" <nigelb@...>
Date: 2001-10-27T11:23:56+09:00
Subject: [ruby-talk:23584] Re: "un"-including a module

On Sat, 27 Oct 2001 03:32, you wrote:
> Here's a quick question: if I include a module, is there any way to
> uninclude it?
>
> Paul

I think that in some situations you can achieve something similar to 
selectively including and excluding a module by using a delegate pattern. I 
have found this useful in fastcgi applications.

require 'delegate'
module Extra; def m2; print "C2-m2\n"; end; end
class C0; def m1; end; def m2; end; end
class C1; def m1; print "C1-m1\n"; end; end
class C2; def m1; m2; end; include Extra; end

c3 = SimpleDelegator.new(C0.new)
# C3 with extra included
c3.__setobj__(C2.new)
c3.m2
# extra gone
c3.__setobj__(C1.new)
c3.m2

-- 
Nigel S. Ball
Enesbe Sales Pty Ltd