From: Nikolay Pavlov <qpadla@...>
Date: 2007-11-02T02:39:13+09:00
Subject: Re: How to extend class with the particular method

--nextPart12066453.aGlo0FP0Zf
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

On Thursday 01 November 2007 17:47:06 Robert Dober wrote:
> Hmm I am not 100% sure what you want exactly
> if I understand correctly you want to include a single method of a
> module into whatever.
> I have implemented this in traits but the overhead is big, you can
> however see in the code
> how this is done.
> Maybe it is worthy to look into the "use" package, written by Daniel.
> It does *exactly* and *only* that.This has been discussed in the
> original announcement of the traits
> http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/274261

That was extremely helpfull. Thanks :)

irb(main):032:0> require 'use'
=3D> true
irb(main):033:0> module Operational
irb(main):034:1>
irb(main):035:1*       def self.included(base)
irb(main):036:2>         base.extend ClassMethods
irb(main):037:2>       end
irb(main):038:1>
irb(main):039:1*       module ClassMethods
irb(main):040:2>         def operational_as(method_name, options =3D {})
irb(main):041:3>             self.instance_eval do
irb(main):042:4*                   use Behavior, method_name
irb(main):043:4>               end
irb(main):044:3>           end
irb(main):045:2>       end
irb(main):046:1>   module Behavior
irb(main):047:2>     def bob
irb(main):048:3>       end
irb(main):049:2>     def sam
irb(main):050:3>       end
irb(main):051:2>     end
irb(main):052:1>   end
=3D> nil
irb(main):053:0> class Op
irb(main):054:1>   include Operational
irb(main):055:1>   end
=3D> Op
irb(main):058:0> @phantomas =3D Op.new
=3D> #<Op:0xb7a56484>
irb(main):056:0> Op.operational_as(:bob)
=3D> Op
irb(main):060:0> @phantomas.respond_to?(:bob)
=3D> true
irb(main):061:0> @phantomas.respond_to?(:sam)
=3D> false
irb(main):062:0> Op.operational_as(:sam)
=3D> Op
irb(main):063:0> @phantomas.respond_to?(:bob)
=3D> false
irb(main):064:0> @phantomas.respond_to?(:sam)
=3D> true



=2D-=20
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =20
=2D Best regards, Nikolay Pavlov. <<<-----------------------------------   =
=20
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =20


--nextPart12066453.aGlo0FP0Zf
Content-Type: application/pgp-signature; name=signature.asc 
Content-Description: This is a digitally signed message part.

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)

iD8DBQBHKg6E/2R6KvEYGaIRAuZyAKDDAYaLy9P6jE8HK/0oHCA8mFiyuQCeKWEo
1WGMZrw4jv4BwgeMPjjDXFM=
=FbtJ
-----END PGP SIGNATURE-----

--nextPart12066453.aGlo0FP0Zf--