Re: pointers and genericity

[xavier.serrand@free.fr (Xavier Serrand)]

thanks for that advise Bob!!

in fact what i would like to do has to do with packagged data ... but
i would like to implement those functionality without any objet
feature...

I made an "object-like" menu in c with struct and
"access-to-procedure" ... somthing very poor for my TI89... and i
wonder if i could make more object-like WITHOUT any object feature...
Almost everything is possible with Ada 83 + very few... and i would
like to proof it for my own sake...

Xavier

Robert A Duff <bobduff@shell01.TheWorld.com> wrote in message news:<wccsm3wo8hv.fsf@shell01.TheWorld.com>...
> xavier.serrand@free.fr (Xavier Serrand) writes:
> 
> > ==============Error messages for source file:
> > test/test_gen_pk_user.adb
> >     30.          U.Rec.Next := Proc_Suiv'access;
> >                                |
> >         >>> access type must not be outside generic body
> 
> If the access type is outside the generic body, then it's illegal
> to take 'Access of a procedure declared inside the generic body.
> The workaround is to declare the procedure in the generic
> package spec.  If you don't want to export it, put it in
> the private part.
> 
> I think the reason for this rule has something to do with making it
> easier to implement code sharing of generic bodies.
> 
> I didn't look at your code carefully, but sometimes it's cleaner to use
> a tagged type with a dispatching procedure, rather than an
> access-to-procedure, because then you can easily package up
> some data with the procedure.
> 
> - Bob