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From: Kevin Chadwick <kc-usenet@chadwicks.me.uk>
Newsgroups: comp.lang.ada
Subject: Re: In precision typing we trust
Date: Thu, 28 Aug 2025 08:50:10 -0000 (UTC)
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>
>I can explain how it works. When a DLL is loaded its library level gets 
>elaborated. So if you have:
>
>package P is
>    type T is tagged ...
>end P;
>
>in the main program or DLL and
>
>with P;
>package Q is
>    type S is new T with ...
>    function F return T'Class;
>end Q;
>
>in the DLL being loaded, then in the process of elaboration S will be 
>created which in particular means extending of the dispatching table. 
>You can return a class-wide object from there and dispatch on the newly 
>created type's operation.
>
>Clear?

Interesting, better than the shape examples but I guess you have to get that
 in the first instance.

-- 
Regards, Kc