From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Subject: Re: array from static predicate on enumerated type
Date: Fri, 12 Mar 2021 23:16:29 +0100 [thread overview]
Message-ID: <s2gp7t$gu3$1@dont-email.me> (raw)
In-Reply-To: <89128f73-fcc5-4e57-8067-d09877ba0211n@googlegroups.com>
On 3/12/21 9:49 PM, Matt Borchers wrote:
> Say, for example, I define a static predicate on a sub-type of an enumerated type, like:
>
> type LETTERS is ( A, B, C, D, E, F, G, H, I , J, K );
>
> subtype CURVED is LETTERS
> with Static_Predicate CURVED in B | C | D | G | J;
>
> What I want is an array over CURVED (using CURVED as the index), but since attributes 'First and 'Last (and thus 'Range) is not allowed, this cannot be done.
>
> Has anybody come up with a clever data structure to make sub-types with predicates easy and sensible for indexing (not iterating)?
>
> I only need read access ...
It sounds as if you want a map, for which one of the map containers in the
standard library would be appropriate.
--
Jeff Carter
"[I]t is foolish to polish a program beyond the
point of diminishing returns, but most programmers
do too little revision; they are satisfied too
early."
Elements of Programming Style
189
next prev parent reply other threads:[~2021-03-12 22:16 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-12 20:49 array from static predicate on enumerated type Matt Borchers
2021-03-12 21:22 ` Egil H H
2021-03-12 22:16 ` Jeffrey R. Carter [this message]
2021-03-12 22:41 ` Dmitry A. Kazakov
2021-03-13 2:06 ` Matt Borchers
2021-03-13 4:55 ` Randy Brukardt
2021-03-15 14:16 ` Matt Borchers
2021-03-15 17:53 ` Shark8
2021-03-16 6:58 ` Randy Brukardt
2021-03-13 8:04 ` Dmitry A. Kazakov
2021-03-15 14:11 ` Matt Borchers
2021-03-15 17:48 ` Shark8
2021-03-15 20:25 ` Dmitry A. Kazakov
2021-03-16 13:27 ` Shark8
2021-03-16 14:25 ` Dmitry A. Kazakov
2021-03-17 4:05 ` Matt Borchers
2021-03-17 7:08 ` Dmitry A. Kazakov
2021-03-17 18:44 ` Matt Borchers
2021-03-17 19:41 ` Dmitry A. Kazakov
2021-03-18 1:30 ` Matt Borchers
2021-03-18 8:20 ` Dmitry A. Kazakov
2021-03-19 0:10 ` Matt Borchers
2021-03-19 8:00 ` Dmitry A. Kazakov
2021-03-18 10:15 ` Niklas Holsti
2021-03-18 10:47 ` AdaMagica
2021-03-18 11:26 ` Dmitry A. Kazakov
2021-03-19 0:34 ` Matt Borchers
2021-03-19 0:49 ` Jeffrey R. Carter
2021-03-23 1:07 ` Matt Borchers
2021-03-23 3:43 ` Randy Brukardt
2021-03-22 19:09 ` Niklas Holsti
2021-03-17 15:08 ` Shark8
2021-03-17 19:08 ` Matt Borchers
2021-03-17 20:41 ` Shark8
2021-03-18 1:04 ` Matt Borchers
2021-03-18 14:25 ` Shark8
2021-03-18 23:36 ` Matt Borchers
2022-03-16 0:38 ` Thomas
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