From: "Anders Engström" <aengstrom@...>
Date: 2004-08-15T00:47:51+09:00
Subject: Re: Opinion on ClassInherit Include

--h31gzZEtNLTqOjlF
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Sat, Aug 14, 2004 at 10:54:28PM +0900, T. Onoma wrote:
> On Saturday 14 August 2004 09:41 am, ts wrote:
> > svg% cat b.rb
> > #!/usr/bin/ruby
> > module MyMod
> >    attr_accessor :x
> >    def hix
> >       puts "Hi, #{@x}."
> >    end
> > end
> >
> > class A
> >    extend MyMod
> > end
> >
> > A.x =3D 'you'
> > A.hix  #=3D> Hi, you.
> > svg%
>=20
> You missed the '# ...' in the example. So that dosen't work. You end up h=
aving=20
> to have two seperate modules, one of which is included the other of which=
 is=20
> extended. I want a single encapsulation. To clarify:
>=20
>   module MyMod
> =A0 =A0 module ClassInherit
> =A0 =A0 =A0 attr_accessor :x
> =A0 =A0 =A0 def hix
> =A0 =A0 =A0 =A0 puts "Hi, #{@x}."
> =A0 =A0 =A0 end
> =A0 =A0 end
> =A0 =A0 def hey
>       puts "Me, too."
>     end
> =A0 end
>=20
> =A0 class A
> =A0 =A0 include MyMod
> =A0 end
>=20
> =A0 A.x =3D 'you'
> =A0 A.hix =A0#=3D> Hi, you.
>   A.new.hey  #=3D> Me, too.
>=20

The way I handle these situations is:

module MyMod
   =20
    class << self
        def included(klass)
            # Also extend the class with
            # the features in ClassMixin
            klass.__send__(:extend, ClassMixin)
        end
    end
   =20
    module ClassMixin
        attr_accessor :x
        def hix
            puts "Hi, #{@x}."
        end
    end
   =20
    def hey
        puts "Me, too"
    end
end

class A
    include MyMod
end

HTH. //Anders

--=20
=2E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
=2E Anders Engstr=F6m         aengstrom@gnejs.net
=2E http://www.gnejs.net    PGP-Key: ED010E7F
=2E [Your mind is like an umbrella. It doesn't work unless you open it.] =
=20


--h31gzZEtNLTqOjlF
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: Digital signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (GNU/Linux)

iD8DBQFBHjOkuNLLbe0BDn8RAtNsAJ9c2m9V0UVFOSkMmqrgY3h+SpgwcgCfUPTP
9uV/hErI9ZLVdK+RQPtoyxY=
=Ls06
-----END PGP SIGNATURE-----

--h31gzZEtNLTqOjlF--