From: "amado.alves" <amado.alves@netcabo.pt>
To: "Simon Wright" <simon@pushface.org>, <comp.lang.ada@ada-france.org>
Subject: RE: Proposed change to BC iterator parameters
Date: Wed, 10 Dec 2003 13:36:47 -0000
Date: 2003-12-10T13:36:47+00:00 [thread overview]
Message-ID: <mailman.69.1071063420.31149.comp.lang.ada@ada-france.org> (raw)
<<...
generic
type Param_Type is private;
with procedure Apply (Elem : in Item;
Param : in Param_Type;
OK : out Boolean);
procedure Visit_With_In_Param (Using : in out Iterator'Class;
Param : in Param_Type);
>>
I've never found a situation where the following much simpler signature wouldn't suffice:
generic
with procedure Apply (Elem : in Item);
procedure Visit_With_In_Param (Using : in out Iterator'Class);
with premature termination of the iteration done by raising inside Apply an exception which Visit_With_In_Param propagates by definition.
<<... type Param_Type (<>) is limited private;
As I understand it, this allows users much more freedom (you can even
use a tagged type provided you instantiate with Tagged_Type'Class)...>>
Strictly you don't need the limited formal for (unlimited) tagged or class actuals. You need the limited formal for limited actuals, whatever their class. Limitedness is completely orthogonal to definiteness. I do like indefinite formals, but I pass well without limited ones. Most limited formals I've seen in libraries are accompanied by a formal assignment operation or some such, which prety much defeats the purpose of their (formal) limitedness, i.e. their logic is in clash with their definition.
next reply other threads:[~2003-12-10 13:36 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-10 13:36 amado.alves [this message]
2003-12-10 16:47 ` Proposed change to BC iterator parameters [limitedness] Georg Bauhaus
2003-12-10 17:39 ` Proposed change to BC iterator parameters Martin Krischik
2003-12-10 18:22 ` Jeffrey Carter
2003-12-10 23:00 ` Robert A Duff
2003-12-11 1:00 ` Jeffrey Carter
2003-12-11 15:09 ` Robert A Duff
2003-12-11 8:33 ` Dmitry A. Kazakov
2003-12-10 20:50 ` Simon Wright
2003-12-10 23:12 ` Robert A Duff
2003-12-11 5:07 ` Steve
2003-12-11 15:24 ` Robert A Duff
2003-12-11 17:39 ` Jeffrey Carter
2003-12-12 22:22 ` Robert A Duff
2003-12-13 0:57 ` Jeffrey Carter
2003-12-17 20:59 ` Robert A Duff
2003-12-18 10:05 ` Dmitry A. Kazakov
2003-12-18 18:14 ` Robert A Duff
2003-12-19 10:53 ` Dmitry A. Kazakov
2003-12-19 16:17 ` Georg Bauhaus
2003-12-19 17:19 ` Dmitry A. Kazakov
2003-12-19 22:51 ` Robert A Duff
2003-12-20 12:20 ` Dmitry A. Kazakov
2003-12-19 22:47 ` Robert A Duff
2003-12-20 2:11 ` Stephen Leake
2003-12-20 19:08 ` Robert I. Eachus
2003-12-21 11:39 ` Simon Wright
2003-12-21 18:13 ` Robert I. Eachus
2003-12-21 13:58 ` Dmitry A. Kazakov
2003-12-22 1:25 ` Robert I. Eachus
[not found] ` <916oa1-c93.ln1@beastie.ix.netcom.com>
2003-12-13 16:57 ` Simon Wright
2003-12-12 5:29 ` Simon Wright
2003-12-12 22:26 ` Robert A Duff
2003-12-13 16:55 ` Simon Wright
2003-12-13 17:27 ` Dmitry A. Kazakov
2003-12-13 2:44 ` Steve
-- strict thread matches above, loose matches on Subject: below --
2003-12-23 10:40 amado.alves
2003-12-19 15:53 amado.alves
2003-12-19 23:05 ` Robert A Duff
2003-12-11 16:02 amado.alves
2003-12-11 15:05 ada_wizard
2003-12-11 16:45 ` Robert A Duff
2003-12-11 12:56 amado.alves
2003-12-17 20:25 ` Robert A Duff
2003-12-11 12:43 amado.alves
2003-12-11 12:33 amado.alves
2003-12-10 14:39 amado.alves
2003-12-10 5:46 Simon Wright
2003-12-10 18:12 ` Jeffrey Carter
2003-12-11 16:10 ` Martin Krischik
2003-12-10 20:59 ` Simon Wright
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