From: MenTaLguY <mental@...>
Date: 2007-10-08T10:19:32+09:00
Subject: Re: The Case for Multiple-Inheritance

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On Mon, 2007-10-08 at 01:12 +0900, Pat Maddox wrote:
> Here's something off the top of my head, that allows you to reason
> about "types" without needing MI.
>=20
> module LinuxApplication; end
> module VideoApplication; end
> module WindowsApplication; end
>=20
> class LinuxVideoApplication
>   include LinuxApplication
>   include VideoApplication
> end
>=20
> class WindowsVideoApplication
>   include WindowsApplication
>   include VideoApplication
> end
>=20
> def only_linux_video_please(app)
>   raise "Must be a LinuxVideoApplication" unless LinuxApplication =3D=3D=
=3D
> app && VideoApplication =3D=3D=3D app
> end

I'm not sure this is a particularly good example; it's based off of
Trans' example, not Sylvain's, and it also does use multiple inheritance
inasmuch as modules amount to restricted MI.

-mental

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