From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Style Question: normal record vs discriminated null-record.
Date: Tue, 3 Jun 2014 09:19:42 +0200
Date: 2014-06-03T09:19:42+02:00 [thread overview]
Message-ID: <1rdxcdjn66fey.1g04zftyyg2jr$.dlg@40tude.net> (raw)
In-Reply-To: hEajv.2899495$g45.2895635@fx10.iad
On Mon, 02 Jun 2014 20:44:24 -0600, Shark8 wrote:
> Ok, given some sort of alert-system (meaning there shouldn't be any/much
> in the way of value manipulation of those objects) is it preferable to
> use a discriminated null-record or a record with normal components?
>
> Type Grievousness is (Warning, Error);
> Type Circumstance is (Expired_Data, Bad_Request, Malformed_Data);
>
> Type Alert_1(Severity : Grievousness; Condition : Circumstance) is
> null record;
>
> Type Alert_2 is record
> Severity : Grievousness;
> Condition : Circumstance;
> end record;
My rule of thumb - discriminants whenever possible, components as a
fallback.
I wished Ada allowed discriminants of any type.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
prev parent reply other threads:[~2014-06-03 7:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-03 2:44 Style Question: normal record vs discriminated null-record Shark8
2014-06-03 4:38 ` J-P. Rosen
2014-06-03 4:40 ` J-P. Rosen
2014-06-03 6:20 ` Shark8
2014-06-03 7:19 ` Dmitry A. Kazakov [this message]
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