From: Yusuke ENDOH <mame@...>
Date: 2009-08-31T21:39:44+09:00
Subject: [ruby-core:25218] Re: Module#prepend and Array#prepend

Hi,

2009/8/31 Yehuda Katz <wycats@gmail.com>:
> Matz,
> As we discussed at LoneStar, I have the following proposal:
(snip)
> Effectively, prepend would prepend a module to the class' ancestor chain.


I cannot guess the problem you want to solve.  I know this mail
is just discussion log or reminder, but I'd like you to elaborate
your proposal completely when sending to ruby-core.

Why don't you define subclass explicitly?

  class Person
    def speak(words)
      puts words
    end
  end
  module Exclaim
    def speak(words)
      super("#{ words }!")
    end
  end
  class Exclaimer < Person
    include Exclaim
  end
  Exclaimer.new.speak("matz") #=> matz!

As far as I read your mail, I think this is the correct way.

Do you want to define Person by including Exclaimer?  If so,
how about this?

  class Person
    def speak(words)
      puts adjust_words(words)
    end
  end
  module Exclaimer
    def adjust_words(words)
      "#{ words }!"
    end
  end
  class Person
    include Exclaimer
  end
  Person.new.speak("matz") #=> matz!

-- 
Yusuke ENDOH <mame@tsg.ne.jp>