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From: Andrea Taverna <a.tavs@hotmail.it>
Newsgroups: comp.lang.ada
Subject: Re: Visibility of package parameters in child packages
Date: Wed, 16 Dec 2009 06:21:18 -0800 (PST)
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Date: 2009-12-16T06:21:18-08:00
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On 16 Dic, 14:14, Georg Bauhaus <rm.dash-bauh...@futureapps.de> wrote:
> Andrea Taverna schrieb:
>
> > and the compiler replied
>
> > -----%<-----%<-----%<-----%<-----%<
> > ]# gnatmake main.adb
> > gcc -c main.adb
> > main.adb:9:05: instantiation error at parent-child.adb:6
> > main.adb:9:05: "F" is not visible (more references follow)
> > main.adb:9:05: instantiation error at parent-child.adb:6
> > main.adb:9:05: non-visible declaration at q.ads:3
> > gnatmake: "main.adb" compilation error
> > -----%<-----%<-----%<-----%<-----%<
>
> > Am I missing something?
>
> It's not a "use" issue I think. =A0P.F is marked invisible,
> too.
I'm not sure I understand you correctly here, however P.F *is*
visible, in fact the compiler stops complaining after prefixig P's
name to F.

> =A0Can you try this:
>
> generic
> =A0 =A0with package P is new Q(<>);
> =A0 =A0use P;
> package Parent is
>
> =A0 =A0function P_F(X : P.T) return P.T
> =A0 =A0 =A0renames P.F;
>
> and then call P_F in place of F.

I'd rather rename P to a shorter name.

thanks,

Andrea