[DGD] Auto and Driver objects

[Ben Chambers]

Ok.  That's what I was wondering, thanks.  Is there anyway to generate your
own errors that will cause an atomic function to rewind?
----- Original Message -----
From: "Felix A. Croes" <felix at dworkin.nl>
To: <dgd at list.imaginary.com>
Sent: Sunday, May 25, 2003 6:47 AM
Subject: Re: [DGD] Auto and Driver objects


> "Ben Chambers" <bjchamb at bellsouth.net> wrote:
>
> >[...]
> > Then to make a specific backpack or something I would want to inherit
both
> > the base object and the container object, but with the container
object's
> > versions of move from and move into overriding the versions defined in
the
> > base object.  Would this be possible?  Basically, the base version
provides
> > the default 'You can't move that from that to that' behavior, while the
> > container provides the you can move it, and the end object is the
specific
> > version of how this is done.
>
> By inheriting from two different objects that both define the same
> function, you introduce a conflict.  That conflict must be resolved by
> masking the function in the inheriting object, like this:
>
>     inherit base "/foo/bar/base";
>     inherit container "/foo/bar/container";
>
>     int MoveInto(object item)
>     {
> return container::MoveInto(item);
>     }
>
>     int MoveFrom(object item)
>     {
> return container::MoveFrom(item);
>     }
>
> There are other ways in which this issue can be addressed.  For instance,
> the container object could be made to inherit the base object, in which
> case its functions would automatically override those of the base object.
> Should another object then inherit both, the compiler will understand
> that the container functions are meant to mask those of the base object,
> and no conflict will ensue.
>
> Regards,
> Dworkin
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