From: "Randy Brukardt" <randy@rrsoftware.com>
Subject: Re: Discriminant of a limited type object
Date: Wed, 28 Feb 2018 17:10:22 -0600
Date: 2018-02-28T17:10:22-06:00 [thread overview]
Message-ID: <p77csu$4i8$1@franka.jacob-sparre.dk> (raw)
In-Reply-To: p74nge$1oto$1@gioia.aioe.org
"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message
news:p74nge$1oto$1@gioia.aioe.org...
...
> The problem is passing state between calls to the function. The code in
> mind is a loop over array elements. The loop body gutted and its parts
> moved into the function.
>
> A : T (1..N);
> begin
> for Index in A'Range loop
> do-init of A (Index)
> end loop;
>
> |
> V
>
> Index : Positive := 1;
> function F return Element is
> begin
> Index := Index + 1;
> return do-init of A (Index - 1);
> end F;
> A : T (1..N) := (others => F)
>
> Quite ugly. In the end I decided to flatten record variants and make the
> discriminant a plain record member. The memory loss is not big enough to
> justify the code above.
Ada 2020 has you covered:
function F(Index : Natural) return Element is
begin
return do-init of A (Index - 1);
end F;
A : T (1..N) := (for I in 1 .. N => F(I));
Note the new iterator choice in the aggregate.
Randy.
next prev parent reply other threads:[~2018-02-28 23:10 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-27 17:54 Discriminant of a limited type object Dmitry A. Kazakov
2018-02-27 22:20 ` Randy Brukardt
2018-02-27 22:53 ` Dmitry A. Kazakov
2018-02-28 6:36 ` J-P. Rosen
2018-02-28 8:42 ` Dmitry A. Kazakov
2018-02-28 9:07 ` J-P. Rosen
2018-02-28 17:16 ` Jeffrey R. Carter
2018-02-28 23:10 ` Randy Brukardt [this message]
2018-03-01 8:43 ` Dmitry A. Kazakov
2018-03-01 22:00 ` Randy Brukardt
2018-03-02 10:30 ` Dmitry A. Kazakov
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