From: Robb.Nebbe@di.epfl.ch (Robb Nebbe)
Subject: Re: Type extension questions
Date: 22 Mar 1995 12:01:40 GMT
Date: 1995-03-22T12:01:40+00:00 [thread overview]
Message-ID: <1995Mar22.125057@di.epfl.ch> (raw)
In-Reply-To: D5tFuE.1vx@ennews.eas.asu.edu
In article <D5tFuE.1vx@ennews.eas.asu.edu>, koehnema@enuxsa.eas.asu.edu (Harry Koehnemann) writes:
|> I have a couple questions on Ada95 tagged types. These appear to be
|> easy questions, but I can't seem to locate an answer for either.
|> LRM references would also be appreciated with an answer.
|>
|> 1) Is it possible to derive a type such that the parent operations are not
|> available to the user of the new type? This question is equivalent to
|> the ability to do private inheritance ala C++ - class B: private A { ...};
|> I would assume the answer is yes, but haven't yet figured out how.
Yes. For example when you need a type to be controlled typically you don't
want to expose the finalize, initialize and adjust operations to the client
so you write:
package P is
type T is private;
private
type T is new Ada.Finalization.Controlled with ...
procedure Adjust( Object : in out T );
...
end P;
A private_type_declaration must be completed with a
full_type_declaration which is in 3.2.1
Robb Nebbe
next prev parent reply other threads:[~1995-03-22 12:01 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
1995-03-22 0:25 Type extension questions Harry Koehnemann
1995-03-22 12:01 ` Robb Nebbe [this message]
1995-03-23 22:05 ` Harry Koehnemann
1995-03-25 6:59 ` Cyrille Comar
1995-03-25 7:13 ` Cyrille Comar
1995-03-27 0:00 ` Norman H. Cohen
1995-03-30 0:00 ` Cyrille Comar
1995-03-27 17:29 ` Harry Koehnemann
1995-03-27 20:26 ` Robert I. Eachus
1995-03-29 0:00 ` Harry Koehnemann
1995-03-27 20:37 ` Kennel
1995-03-23 22:03 ` Tucker Taft
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