From: Jim Freeze <jimfreeze@...>
Date: 2006-03-11T22:25:08+09:00
Subject: Re: unextend ?

Hi

Have you tried #dup?

% cat unextend
module Actor
   def work
     "actor"
   end
end

module Waiter
   def work
     "waiter"
   end
end

class Human; end

dirk = Human.new
dirk.extend Actor
p dirk.work

begin
dirk = dirk.dup
p dirk.work
rescue
   puts "dirk has no job"
end

dirk.extend Waiter
p dirk.work

% ruby unextend
"actor"
dirk has no job
"waiter"

And, to put it in the nice #unextend method:

class Object
   def unextend
     self.replace dup
   end
end

module Actor
   def work
     "actor"
   end
end

module Waiter
   def work
     "waiter"
   end
end

class Human; end

dirk = Human.new
dirk.extend Actor
p dirk.work

begin
dirk.unextend
p dirk.work
rescue
   puts "dirk has no job"
end

dirk.extend Waiter
p dirk.work

% ruby unextend
"actor"
dirk has no job
"waiter"


On Mar 9, 2006, at 10:03 AM, Dirk van Deun wrote:

> A very short and simple question: is there a function to "unextend" an
> object ?  Obviously it does not exist under that name, nor could I  
> find
> anything like it.  It would be useful though to do "traits":
>
> dirk = Human.new
> dirk.extend(actor)
> dirk.work
> if dirk.income < PITTANCE
>   dirk.unextend(actor)
>   dirk.extend(waiter)
>   dirk.work
> end
>
> Dirk van Deun
> -- 
> Ceterum censeo Redmond delendum
>

Jim Freeze