Re: Re: Registries [2]

At 18:33 2003-07-31, David Abrahams wrote:
>Daniel Wallin <[email protected]> writes:
>
> > At 15:12 2003-07-31, David Abrahams wrote:
> >>Daniel Wallin <[email protected]> writes:
> >>
> >> > At 03:08 2003-07-31, David Abrahams wrote:
> >> >>Daniel Wallin <[email protected]> writes:
> >> >>
> >> >> > At 00:25 2003-07-31, David Abrahams wrote:
> >> >> >
> >> >> >>This seems to me to be the killer argument against having any 
> implicit
> >> >> >>imports of from-xxx converters.  No?
> >> >> >
> >> >> > Well, yeah.. Unfortunately the same argument applies to the
> >> >> > cast-graph too.
> >> >>
> >> >>:(
> >> >
> >> > But we can still share the code though, right?
> >>
> >>Sure.
> >>
> >> > I already made the local registry into a singleton, so we'd just do
> >> > the same for the inheritance-code and link registry<T>::instance()
> >> > and inheritance_graph::instance() statically.
> >>
> >>And how would two extensions share a cast-graph?
> >
> > They wouldn't.
>
>That would be bad.  You need to be able to write derived classes in
>different extensions from the base.

Right.

> > Perhaps it would be possible to share subgraph's without duplicating
> > the data, but I don't know.
> >
> > Or did you mean how it would be related to importing? In that case I
> > guess we'd just import all reachable vertices from the vertex
> > associated with the imported type..
>
>Hmm, you're suggesting importing cast graph components?  I don't know;
>it seems like a waste for several extensions which are known to
>collaborate to have to each maintain a separate copy of the cast
>graph.  I think we can do better.

Ok, do you have any ideas? Would it be impossible to just share subgraph's?
Meaning having edges that point to vertices in another local cast-graph.

---
Daniel Wallin



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