From: Stephen Davies <joviangm@gmail.com>
Subject: Re: Proposal: Auto-allocation of Indefinite Objects
Date: Sat, 1 Aug 2020 13:35:32 -0700 (PDT) [thread overview]
Message-ID: <f5f6a6ab-b7ac-4e0a-8383-f388e94842d2n@googlegroups.com> (raw)
In-Reply-To: <rg3osu$m7k$1@gioia.aioe.org>
On Saturday, 1 August 2020 at 13:58:10 UTC+1, Dmitry A. Kazakov wrote:
> On 01/08/2020 13:22, Stephen Davies wrote:
> > type Node_Type (<>) is record
> > Item : Element_Type;
> > Prev : Node_Ptr_Type;
> > Next : Node_Ptr_Type;
> > end record;
> > The rules for such records would be the same as for discriminated ones,
> > except that instead of usages needing to provide values for discriminants,
> > they would need to provide values for indefinite components.
> 1. There is no discriminants for cases when Item is T'Class.
> 2. You cannot get discriminant from the value in the case of Rosen trick...
> 3. Copying is involved. There should be none, especially for limited types...
I'm mainly talking about situations in which there doesn't need to be a
discriminant at all, e.g. when Element_Type is an indefinite non-limited
generic parameter. In other words, Node_Type would then also be indefinite,
but not discriminated.
> Why not to make this legal?
> X : T := ("hello!", 123); -- L is deduced from S
Maybe that's something that should be fixed anyway, though this is indeed
another situation that (both versions of) my proposal would address, by
removing (the somewhat redundant) L altogether.
next prev parent reply other threads:[~2020-08-01 20:35 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-03 22:48 Proposal: Auto-allocation of Indefinite Objects Stephen Davies
2020-04-03 23:45 ` Stephen Leake
2020-04-04 10:54 ` Jeffrey R. Carter
2020-04-04 20:55 ` Stephen Davies
2020-04-04 8:31 ` Dmitry A. Kazakov
2020-07-27 7:47 ` Yannick Moy
2020-07-27 9:21 ` J-P. Rosen
2020-07-27 9:49 ` Dmitry A. Kazakov
2020-07-27 17:48 ` Brian Drummond
2020-07-27 20:02 ` Dmitry A. Kazakov
2020-07-28 14:28 ` Brian Drummond
2020-07-28 14:59 ` Dmitry A. Kazakov
2020-07-29 15:33 ` Brian Drummond
2020-07-29 16:20 ` Dmitry A. Kazakov
2020-07-30 13:37 ` Stephen Davies
2020-07-30 14:23 ` Dmitry A. Kazakov
2020-07-30 17:04 ` Brian Drummond
2020-07-30 18:28 ` Dmitry A. Kazakov
2020-08-10 0:39 ` Randy Brukardt
2020-08-10 8:57 ` Dmitry A. Kazakov
2020-08-20 0:10 ` Randy Brukardt
2020-08-20 17:49 ` Dmitry A. Kazakov
2020-08-20 20:19 ` Dennis Lee Bieber
2020-08-20 23:33 ` Randy Brukardt
2020-08-21 6:45 ` Dmitry A. Kazakov
2020-08-23 4:52 ` Randy Brukardt
2020-08-23 12:28 ` Dmitry A. Kazakov
2020-08-20 23:30 ` Randy Brukardt
2020-08-21 6:46 ` Dmitry A. Kazakov
2020-08-23 4:48 ` Randy Brukardt
2020-08-23 12:29 ` Dmitry A. Kazakov
2020-08-10 0:31 ` Randy Brukardt
2020-08-10 8:58 ` Dmitry A. Kazakov
2020-08-20 0:13 ` Randy Brukardt
2020-08-20 17:49 ` Dmitry A. Kazakov
2020-08-20 23:25 ` Randy Brukardt
2020-08-21 7:08 ` Dmitry A. Kazakov
2020-08-23 5:03 ` Randy Brukardt
2020-08-23 12:28 ` Dmitry A. Kazakov
2020-07-27 20:31 ` Jeffrey R. Carter
2020-07-31 9:25 ` Stephen Davies
2020-07-31 10:20 ` Dmitry A. Kazakov
2020-08-01 11:22 ` Stephen Davies
2020-08-01 12:58 ` Dmitry A. Kazakov
2020-08-01 20:35 ` Stephen Davies [this message]
2020-08-01 20:56 ` Dmitry A. Kazakov
2020-09-03 4:30 ` linda white
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox