Re: Exporting generic's and tagged types

[srini <r.srinivasan@worldnet.att.net>]

Stephen Leake wrote:
> 
> srini <r.srinivasan@worldnet.att.net> writes:
> 
> > Some hopefully simple questions I cannot find answers for :
> >
> > a) Is there a way to make generic packages preinstantiated exported to
> > "C" for example?
> 
> You can put a "pragma Export (C, ...)" in the generic package itself,
> so that when it is instantiated, the appropriate things are exported.
> 
> Does that do what you want?
> 
> One problem with this scheme is the C name. If you specify it
> explicitly in the pragma Export, you cannot instantiate the package
> twice (you'll get link time collisions). On the other hand, if you do
> not specify it explicitly, you have a compiler dependency.
> 
sounds like a problem to me........

> > b) Is there a way to export a set of packages that declare/define a
> > family of base and derived data types and algorithms on these.
> 
> Not clear what you mean by "export" here; pragma Export does not apply
> to packages.
> 
> Maybe you mean "automatically apply pragma Export to everything in
> this set of packages". No way to do that. Might be a good application
> for ASIS.
> 

well. I have such a family of such algorithms and data structures. work
quite well as long as i am within the Ada world. Now there is some
necessity to provide these facilities to VB. It would appear that there
is no easy way to accomplish this. Too bad. COM might be the way to do
it but I was hoping to avoid that.

thanks anyway

> --
> -- Stephe