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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Newbie Visibility Problem TEXT_IO.INTEGER_IO
Date: Thu, 03 Jun 2004 09:16:49 +0200
Organization: At home
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Date: 2004-06-03T09:16:49+02:00
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bm34mailing wrote:

> I am very new to Ada and am having a visibility problem that I am not
> sure how to get around. I am trying to build the "MostUltimateAnswer"
> sample application from the LAW web site (Section 1.2.12).
> 
> http://www.scism.sbu.ac.uk/law/Section1/chap2/s1c2p12.html
>
> Can someone give me a hint as to the problem? I am using GNAT 3.15p and
> am thinking that I am missing a library or some settings need to be
> changed. At the beginning of the program, I do have the lines:
> 
> with Ada.Text_IO;
> use Ada.Text_Io;
> 
> so I believe Text_io should be visible.

It isn't.

I will try to explain it. In the program you have:

   package IntIo is new TEXT_IO.INTEGER_IO( INTEGER );

Here Text_IO is not visible, because it is declared in the package Ada. Thus
the variant

(A)

with Ada.Text_IO;
use Ada.Text_IO;

use Ada; -- This makes Text_IO visible!
...
   package IntIo is new TEXT_IO.INTEGER_IO( INTEGER );

You can also use the full name of Integer_IO, the following variant:

(B)

with Ada.Text_IO;
...
   package IntIo is new ADA.TEXT_IO.INTEGER_IO( INTEGER );
                     -- The fully qualified name

Though Integer_IO is already visible as other posters noted, so the variant:

(C)

with Ada.Text_IO;
use Ada.Text_IO;
...
   package IntIo is new INTEGER_IO( INTEGER );
                     -- Ada.Text_IO.Integer_IO is visible

And finally, for backward compatibility with Ada 83, there is the package
Text_IO (renamed Ada.Text_IO). Probably that misled the code author, who
mixed both old and new nomenclature. So to complete the picture, in Ada 83
style:

(D)

with Text_IO;
...
   package IntIo is new TEXT_IO.INTEGER_IO( INTEGER );

-- 
Regards,
Dmitry A. Kazakov
www.dmitry-kazakov.de