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From: Laurent Guerby <guerby@acm.org>
Subject: Re: tagged types extensions - language design question
Date: 2000/01/27
Message-ID: <867lgvs47x.fsf@ppp-112-253.villette.club-internet.fr>#1/1
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X-Trace: front2m.grolier.fr 949000861 5517 194.158.112.253 (27 Jan 2000
 19:21:01 GMT)
Organization: Club-Internet (France)
NNTP-Posting-Date: 27 Jan 2000 19:21:01 GMT
Newsgroups: comp.lang.ada
Date: 2000-01-27T19:21:01+00:00
List-Id: <comp.lang.ada>

"Vladimir Olensky" <vladimir_olensky@yahoo.com> writes:

> The question is :
> 
>    Why in Ada it is  not allowed to extend both public
>  and private part of the tagged type at one step ( using
>  kind of syntax as in the following example ):
> 
> package P is
> 
>    type T is tagged private;
> 
>    type T1 is new T with
>       record with private
>                  something: some_type;
>       and record;
> 
> private
> 
>    type T is tagged with
>       record
>            ID : Integer;
>       end record;
> 
>    type T1 is new T with
>       record
>           thing : some_other_type;
>       end record;
> 
> end P;

What about:

   type T1_Private is private;

   type T1 is new T with  record
      something_public  : some_type;
      something_private : T1_Private;
   end record;

private

   type T1_Private is record
      -- whatever...
   end record;

>     It would be interesting to know what were
> the reasons not to allow to have BOTH a record
> extension AND a private extension at the same time.

Looks like it's easy to emulate, at least in the simple case you
provided.

> Regards,
> Vladimir Olensky

--LG