From: Yukihiro Matsumoto <matz@...>
Date: 2007-07-14T11:36:05+09:00
Subject: Re: Inheritable mixin

Hi,

In message "Re: Inheritable mixin"
    on Sat, 14 Jul 2007 05:14:02 +0900, TRANS <transfire@gmail.com> writes:

|What do you think of making Class not inherit Module, but instead make
|them separate classes that both mixin "Inheritable" (or whatever you'd
|like to call it)?

By separating modules and classes, we get class hierarchy design
clarity at the cost of little bit language complexity.  Making
mixin (modules) inheritable means introducing "full" multiple
inheritance in the language.  I don't think it's worth changing the
language we live happily without full MI.

|The thought occurred to me while organizing Facets. I've been locking
|at what methods might fit together into organization units, ie,
|mixins, so far I've been able to successfully develop Indexable and
|Stackable.

More concrete example please?  I am not sure the benefit of having

  module Indexable
  end

  class Whatever < Indexable
  end

over

  class Whatever
    include Indexable
  end

							matz.