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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Polymorphism
Date: Mon, 11 May 2015 20:29:49 -0500
Organization: Jacob Sparre Andersen Research & Innovation
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Date: 2015-05-11T20:29:49-05:00
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"slos" <new.stephane.los@gmail.com> wrote in message 
news:d0b830a1-19c8-462e-b1c8-a2b19e470674@googlegroups.com...
Le jeudi 7 mai 2015 21:09:33 UTC+2, Randy Brukardt a écrit :
...
> If I remember correctly, I should have verified before posting but it's 
> already
> late, in C++ one can have protected members which can be used by friends.
> I can't see in Ada such thing like protected stuff and friends. Maybe 
> there is ?

Ada uses child packages for that sort of functionality; to be a "friend" in 
Ada, a package has to be a child. Often, a parent and set of children is 
referred to as a "subsystem". [Private packages also can be part of a 
subsystem, that's where they're useful.] Unrestricted use of friends 
appeared to lead to madness (at a minimum, visibility madness), where 
dependencies go all which ways. Ada limits such dependencies to a single 
subsystem. (Generally, one wants to minimize dependences.)

...
>I am quite happy with the child package solution exposed here by Simon
>but then that has disturbed my packages hierarchy... ;-)

Yup. There's no free lunch. ;-)

                     Randy.