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From: keld.nielsen@agip.it (Keld Lund Nielsen)
Newsgroups: comp.lang.ada
Subject: Re: Visibility problems in Parent.Child configuration
Date: 1 Aug 2002 00:51:18 -0700
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t_wolf@angelfire.com (Thomas Wolf) wrote in message news:<719a5d07.0207310257.63c9645@posting.google.com>...
> keld.nielsen@agip.it (Keld Lund Nielsen) wrote in message news:<383f908a.0207300341.1047c075@posting.google.com>...
> > Dear All,
> > 
> > a question regarding type visibility. The configuration is as follows:
> > 
> > ----file Parent.ads:
> >  with Ada.Numerics.Generic_Elementary_Functions;
> > package Parent is
> > 
> >    package Float_64 is
> >       type Instance is digits 15;
> >         for Instance'Size use 64;
> >         package Operations is
> >           new Ada.Numerics.Generic_Elementary_Functions( Instance );
> >    end Float_64;
> > 
> > end Parent;
> > 
> > ----file Parent.Generic_Child.ads:
> >  generic
> >   type Instance is private;
> > 
> > package Parent.Generic_Child is
> >    --void...
> > end Parent.Generic_Child;
> > 
> > 
> > Then I create a test system with the structure:
> > 
> >   Test.Parent.Child
> > 
> > but when I try to create an instance of Generic_Child or just declare
> > a subtype of the Parent.Float_64.Instance, then the compiler protests
> > and gives the message that Float_64 is not in Parent!
> > 
> > Moreover, when instantiated from a simple package - say "my_package" -
> > then it works perfectly, yet not from the "Test.Parent.Child".
> 
> That's because if you do e.g.
> 
> package Test.Parent.Child is
> 
>   subtype My_Float is Parent.Float_64.Instance;
> 
> end Test.Parent.Child;
> 
> the name "Parent" refers to package "Test.Parent", not
> to package "Parent". To refer from within "Test.Parent" or
> one of its children to the top-level package "Parent", use
> "Standard.Parent". E.g.
> 
> package Test.Parent.Child is
> 
>   subtype My_Float is Standard.Parent.Float_64.Instance;
> 
> end Test.Parent.Child;
> 
> should work.

It DOES work - thank you very much.
Cheers
Keld