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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Taking another spanking.
Date: Mon, 8 Jun 2009 17:40:59 -0500
Organization: Jacob Sparre Andersen
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Date: 2009-06-08T17:40:59-05:00
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"Georg Bauhaus" <rm.tsoh.plus-bug.bauhaus@maps.futureapps.de> wrote in 
message news:4a2a6ef5$0$30223$9b4e6d93@newsspool1.arcor-online.net...
...
>> In this case, I expand that to: Why not use GNAT package 
>> GNAT.Sockets.Thin
>> instead of re-creating a few "pragma import" or re-creating the Thin 
>> package.
>
> GNAT.Sockets is vendor specific, sockets aren't as far as Ada goes.
> GNAT.Sockets.Thin is not only vendor specific, the vendor says you
> should not use it.

Packages like GNAT.Sockets.Thin are supposed to be private packages; then 
users *couldn't* use it (it would be illegal to reference in a with clause). 
Indeed, the reason that "private with" was added in Ada 2005 was to make 
that more possible.

It's always better to use the language facilities to prevent misuse rather 
than trust users to read and follow the documentation. There's always 
someone who won't follow the written directions! (That's why almost all of 
the Claw implementation articfacts are hidden in private parts and private 
packages.)

                                          Randy.