Re: Run-Time Type Assignment

["Pat Rogers" <progers@classwide.com>]

"Frank J. Lhota" <NOSPAM.lhota.adarose@verizon.net> wrote in message
news:Jf8b9.15221$zT.6491@nwrddc04.gnilink.net...
> "Robert A Duff" <bobduff@shell01.TheWorld.com> wrote in message
> news:wccn0r7hx5y.fsf@shell01.TheWorld.com...
> > Kilgallen@SpamCop.net (Larry Kilgallen) writes:
> >
> > > What is a downward closure ?
> >
> > The ability to pass a procedure as a parameter to a procedure.
>
> <snip>
>
> > GNAT supports downward closures via the 'Unrestricted_Access
attribute,
> > but that's not Ada (unfortunately).
>
> What about using just the plain old 'Access attribute to pass a
pointer to
> the procedure as a parameter? That is supported by all Ada 95
compilers.

The accessibility rules prevent that approach in the general case.

Do a search -- this topic is well covered!


--
Patrick Rogers                       Consulting and Training in:
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