From: Robert A Duff <bobduff@shell01.TheWorld.com>
Subject: Re: Instantiating private types with discriminants?
Date: 11 May 2006 11:59:37 -0400
Date: 2006-05-11T11:59:37-04:00 [thread overview]
Message-ID: <wccody4lfh2.fsf@shell01.TheWorld.com> (raw)
In-Reply-To: 13byov3p0dqhk.yglz3nh5rpb8$.dlg@40tude.net
"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
>...Both
> overloading and overriding are forms of polymorphism, so yes, in that sense
> it is similar. The difference becomes obvious if you have moved
> declarations of Type_A and Type_B into separate packages.
Right. I suggest that "rick H" should rewrite his examples in the more
usual way -- one tagged type per package, and make them library
packages.
Then you can have a procedure that does dispatching calls to that
abstract subprogram, without having any visibility on the packages where
Type_A and Type_B are declared.
The abstract procedure is a place-holder -- the compiler needs to know
the parameter types and so forth.
> > Iterator := Iterator.all.Next;
>
> You don't need "all" here:
>
> Iterator := Iterator.Next;
>
> Ada's pointers are transparent to record member/discriminant and array
> element (indexing) access.
Syntactically transparent, but not semantically. If the ".all" syntax
weren't so darn ugly, I would recommend always using an explicit
dereference. I believe there's an option in GNAT (a Restriction
pragma?) that allows you to force yourself to always say ".all",
which might not be a bad idea.
- Bob
next prev parent reply other threads:[~2006-05-11 15:59 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-09 13:17 Instantiating private types with discriminants? rick H
2006-05-09 13:45 ` Georg Bauhaus
2006-05-09 14:06 ` rick H
2006-05-09 13:56 ` Ludovic Brenta
2006-05-09 14:24 ` rick H
2006-05-09 19:48 ` Ludovic Brenta
2006-05-09 14:05 ` Dmitry A. Kazakov
2006-05-09 14:48 ` rick H
2006-05-09 15:20 ` Jerry Petrey
2006-05-09 15:42 ` rick H
2006-05-09 15:53 ` Avoiding use Ada.Tags (was Re: Instantiating private types with discriminants?) Alex R. Mosteo
2006-05-09 16:01 ` Instantiating private types with discriminants? Dmitry A. Kazakov
2006-05-10 7:42 ` rick H
2006-05-10 9:09 ` Ludovic Brenta
2006-05-10 11:49 ` Georg Bauhaus
2006-05-10 13:44 ` rick H
2006-05-10 14:21 ` Ludovic Brenta
2006-05-10 15:10 ` rick H
2006-05-10 15:45 ` Ludovic Brenta
2006-05-10 14:41 ` Dmitry A. Kazakov
2006-05-10 15:34 ` rick H
2006-05-10 19:01 ` Georg Bauhaus
2006-05-10 19:05 ` Ludovic Brenta
2006-05-10 21:52 ` Rick H
2006-05-11 1:17 ` Jeffrey R. Carter
2006-05-11 7:44 ` Dmitry A. Kazakov
2006-05-11 8:27 ` rick H
2006-05-11 10:28 ` Dmitry A. Kazakov
2006-05-11 15:59 ` Robert A Duff [this message]
2006-05-12 7:37 ` Dmitry A. Kazakov
2006-05-12 9:24 ` Georg Bauhaus
2006-05-12 12:40 ` Dmitry A. Kazakov
2006-05-12 18:25 ` Randy Brukardt
2006-05-09 19:57 ` "Use" and "=" for Tags (was: Re: Instantiating private types with discriminants?) Jeffrey R. Carter
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