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From: lutz@iks-jena.de (Lutz Donnerhacke)
Newsgroups: comp.lang.ada
Subject: Re: controlled type in generic package?
Date: 7 Feb 2001 10:11:26 GMT
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* Mark Lundquist wrote:
>Lutz Donnerhacke <lutz@iks-jena.de> wrote in message
>> Yep. The derivation tree must be public:
>
>That's not true!  There's nothing wrong with this code...
>
>The compilation error that was reported would have been due to the
>instantiation.  The instantiation is a copy of the generic template, so you
>can't instantiate a generic that does something that would be illegal to do
>in the same place if it weren't in a generic :-).  In this case, that
>something is to declare a type extension that's statically deeper than the
>parent.

I don't understand the reason, but will keep it in mind, until I came across
this situation.

>You certainly can derive privately -- and should, unless there's a reason
>not to.

Fine.