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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Visibility issue
Date: Thu, 17 Sep 2020 18:47:02 +0200
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On 17/09/2020 17:32, Daniel wrote:
> El jueves, 17 de septiembre de 2020 a las 17:00:38 UTC+2, Dmitry A. Kazakov escribió:
>> On 17/09/2020 15:31, Daniel wrote:
>>> El miércoles, 16 de septiembre de 2020 a las 23:48:34 UTC+2, Simon Wright escribió:
>>>> I still don't understand _why_.
>>> ¿Why a tagged type in a callback function to send data to users?
>>> It wasn't my decision. It's an imposed requirement.
>>> (...yes sometimes I don't understand some requirements/limitations neither.)
>>>
>>>> Purely from the visibility aspect,
>>>>
>>>> package API is
>>>> function F return Integer;
>>>> private
>>>> Secret : constant := 42;
>>>> end API;
>>>>
>>>> private package API.Impl is
>>>> Altered : constant := Secret / 2;
>>>> end API.Impl;
>>>>
>>>> with API.Impl;
>>>> package body API is
>>>> function F return Integer is (Impl.Altered);
>>>> end API;
>>>
>>> ok Lets try to fit this requirement:
>>>> "There will be one or more internal packages not visible to users where information is created. Preferably not in API hierarchy"
>> 1. API.Impl is not in the public hierarchy of API.
> Sadly requirement says to dont be neither public or private hierarchy part of the API.

Private child has exactly same semantic as the private part of API 
package. A requirement cannot forbid one yet allow another. If it does 
fire the guy who wrote it for incompetence.

>> 2. Alternatively rename API.Impl into API_Impl. Move all secrets from
>> API to API_Impl. Use API_Impl with the body of API.

package API is
    ...
end API;

with API_Impl;
package body API is
   ...
end API;

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de