Re: Registries

At 20:05 2003-07-12, David Abrahams wrote:
>"Daniel Wallin" <[email protected]> writes:
>
> > In lua I think the most common usage is to just expose
> > types/functions directly to the interpreter from your app.
>
>I'm not sure what that means.  Don't they have to be bound into some
>module in order to be accessible from the interpreter?

No, lua doesn't share python's concept of modules.

> >> * It seems to me that it might be desirable to be able to use
> >> multiple language bindings in the same system (e.g. so people could
> >> write interacting Python and lua extensions) but I can't really see
> >> how that pans out.  I believe SWIG provides something like that,
> >> but I don't know much about it.  Perhaps Dave Beazley wouild like
> >> to comment?
> >
> > Would we automatically expose types/functions lua<->python?
>
>I don't know what that means.

I'm not so sure either. :) I was thinking that we could automatically forward
calls from one interpreter to the other, with some type of "bridge" functions.
But I have no idea on what type of interaction is of interest, so I'm hoping
someone with a little knowledge on this will comment.

> >> The only obvious opportunity for sharing I can see is in the
> >> registry of up-/down-casts (inheritance.[cpp/hpp]) used to traverse
> >> the inheritance hierarchy.  That would tend to dictate that the
> >> Boost.Python/.Luabind shared libs would link to a common shared lib
> >> containing that info.
> >
> > When using multiple language bindings in the same system, it's
> > probably desirable to keep the cast-graph's separated.
>
>Why?  I can't see any good reason for that.

You are right, there are no good reasons. I was confused.
All inheritance code can be shared directly.

How do you feel about making the conversion registry into
a template which is parameterized with a language descriptor?
We could share a lot of code by doing that.

---
Daniel Wallin



-------------------------------------------------------
This SF.Net email sponsored by: Parasoft
Error proof Web apps, automate testing & more.
Download & eval WebKing and get a free book.
www.parasoft.com/bulletproofapps1