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Date: Mon, 22 Jan 2018 07:54:26 -0800 (PST)
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Subject: Re: making a son benefit access ton an instanciation of a generic
 package required as a formal parameter to his father and instanciated by him
From: Mehdi Saada <00120260a@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:50057
Date: 2018-01-22T07:54:26-08:00
List-Id: <comp.lang.ada>

Le lundi 22 janvier 2018 16:36:10 UTC+1, Mehdi Saada a =C3=A9crit=C2=A0:
> > Imagine this:
> > generic
> >    package P1 is new GP1 (<>);
> >    package P2 is new GP1 (<>);
> > package GP2 is... end GP2;
> package Inst1 is new GP1;
> package Inst2 is new GP2 (Inst1, Inst1);
> then you would end up with two different handlers for the same exception =
(since formals P1 and P2 are actually the same package Inst1). And that's a=
 no-no!
Ah ! Now I get it. Earlier explanations seemed like chinese homonyms, but a=
 fine example makes it crystal clear. The terminology is this area, is stil=
l too abstract and confuses me, 'cause I barely touched it yet. I didn't co=
nsidered that eventuality of two different views (is that the term ?) of th=
e same instances screwing with each others... eventhough it's not so much c=
onvoluted.


... Thinking about it, I was under the false assumption that the generic it=
self was passed as parameter, and instanciated by or inside the second gene=
ric package, whereas it's clear from the instanciation of the latter, that =
it takes on an INSTANCE. I wasn't even conscious of that confusion. It just=
 messed up my reasoning...