From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Preventing private procedure visibility being made public through extension
Date: Sun, 21 May 2017 23:20:35 +0200
Date: 2017-05-21T23:20:35+02:00 [thread overview]
Message-ID: <oft0b1$196q$1@gioia.aioe.org> (raw)
In-Reply-To: f4506d58-f182-45cf-a3ac-830a6ef790d8@googlegroups.com
On 2017-05-21 22:21, Jere wrote:
> The actual use case has
> them in separate packages, but the problem is the same:
No. Robert meant that when you declare a subprogram in a separate
package [more precisely after the type's freezing point] it will not
become a primitive operation. A non-primitive operation is simply not
inherited and if not visible, is gone. Being not inherited is a very
important point, it will be rejected for derived types even if visible.
Consider this:
package Base is
type Base_Type is tagged null record;
end Base;
package Base_Something is
procedure Something (X : in out Base_Type; Y : Integer) is null;
end Base_Something;
package Derived is
type Derived_Type is new Base_Type with null record;
end Derived;
package Derived_Something is
procedure Something (X : in out Derived_Type; Y : String) is null;
end Derived_Something;
use Base, Derived, Base_Something, Derived_Something;
X : Base_Type;
Y : Derived_Type;
begin
Something (X, 1); -- OK
Something (Y, 2); -- Type error!
Something (Y, "2"); -- OK
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2017-05-21 21:20 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-20 17:33 Preventing private procedure visibility being made public through extension Jere
2017-05-20 20:13 ` AdaMagica
2017-05-20 21:55 ` Jere
2017-05-20 20:32 ` Dmitry A. Kazakov
2017-05-20 22:51 ` Jere
2017-05-21 0:51 ` Jere
2017-05-21 9:16 ` Chris Moore
2017-05-21 22:55 ` Jere
2017-05-21 8:44 ` Dmitry A. Kazakov
2017-05-21 12:19 ` J-P. Rosen
2017-05-21 12:53 ` Dmitry A. Kazakov
2017-05-21 20:06 ` Jere
2017-05-21 21:07 ` Dmitry A. Kazakov
2017-05-21 22:28 ` Jere
2017-05-22 8:52 ` Dmitry A. Kazakov
2017-05-22 13:33 ` AdaMagica
2017-05-22 13:43 ` AdaMagica
2017-05-22 21:17 ` Randy Brukardt
2017-05-25 4:06 ` Jere
2017-05-25 19:39 ` Randy Brukardt
2017-05-25 22:53 ` Jere
2017-05-25 22:57 ` Jere
2017-05-26 20:46 ` Randy Brukardt
2017-05-26 22:35 ` Simon Wright
2018-05-20 11:22 ` Simon Wright
2018-05-20 12:03 ` Jere
2017-05-26 22:58 ` Jeffrey R. Carter
2017-05-30 21:15 ` Randy Brukardt
2017-06-02 1:07 ` Jere
2017-06-02 7:31 ` Dmitry A. Kazakov
2017-06-02 8:09 ` Mark Lorenzen
2017-06-02 11:31 ` Simon Wright
2017-05-22 21:12 ` Randy Brukardt
2017-05-23 7:38 ` Dmitry A. Kazakov
2017-05-21 18:14 ` Robert Eachus
2017-05-21 20:21 ` Jere
2017-05-21 21:09 ` Jeffrey R. Carter
2017-05-21 22:46 ` Jere
2017-05-22 21:24 ` Jeffrey R. Carter
2017-05-25 3:45 ` Jere
2017-05-21 21:20 ` Dmitry A. Kazakov [this message]
2017-05-21 21:45 ` Jere
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