Re: [Plib-devel] RTTI

[Steve B. <sjb...@ai...>]

Norman Vine wrote:
> 
> Steve Baker writes:
> >
> >> Dave McClurg wrote:
> >>
> >> I'm ready to integrate RTTI into plib.  See the attached file foo.cxx for
> an
> >> example of the macros I plan on using.  Let me know if this works for
> you.
> 
> Whoa !!
> Let's slow down a little here :-)
> 
> >> It would go into ssg and pui and affect any code that
> >> references 'int type' from ssgBase and also do away with the
> >> SSG_TYPE_XXXX defines and ssgTypeXXXX() functions.
> >
> >Hopefully, there are no applications using the SSG_TYPE_XXXX
> >functions -
> 
> PPE and FlightGear both use these !!!
> As I would imagine does any SSG application that actually walks
> the SSG tree for itself rather then using a 'built-in' method.

You can use 'ssgTypeXXX()' - but I don't think you should ever
use SSG_TYPE_XXX.

We need to be sure that ulRTTI reproduces the behavior of ssgTypeXXX,
and the isA and isAKindOf stuff - but if your application is using
SSG_TYPE_XXXX then you should change the application to use 'isA'
and 'isAKindOf'.

> At first glance it appears that it would be fairly easy
> to change the FGFS code, and I think PPE would change
> fairly easily too
> 
> BUT ..
> 
> I would like to see how this would be Integrated into
> PLib before I can whole heartily throw my support behind
> this proposal.

Yes.  That's why we have CVS!
 
> FWIW
> My biggest concern is that by moving to a MACRO based
> implementation of RTTI it will be much harder for PLib to
> evolve gracefully < ie with out major code surgery>.
> 
> Again I am not against this proposal it is just that I need
> some time to think about it as I believe that this potentially
> represents a major change.

Well, I think it can be handled 'behind the scenes' - and it's
a lot more elegant than my original mechanism.

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