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devel / comp.lang.ada / Finding the next or the previous value in a enumerated type

Finding the next or the previous value in a enumerated type

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https://www.rocksolidbbs.com/devel/article-flat.php?id=9036&group=comp.lang.ada#9036

Date: Sat, 19 Nov 2022 15:05:50 +0100
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From: bertus.dries@planet.nl (ldries46)
Subject: Finding the next or the previous value in a enumerated type
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by: ldries46 - Sat, 19 Nov 2022 14:05 UTC

I do have a enumated type:
type VALUE is (ABC, DEF, GHI, JKL, MNOP);
Suppose I have a parameter with the value DEF is there a simple way to
get the next value like you can with integers in the way of V2 := V1 + 1
for instance OUT := NEXT( ABC).

Re: Finding the next or the previous value in a enumerated type

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From: niklas.holsti@tidorum.invalid (Niklas Holsti)
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Subject: Re: Finding the next or the previous value in a enumerated type
Date: Sat, 19 Nov 2022 16:32:33 +0200
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by: Niklas Holsti - Sat, 19 Nov 2022 14:32 UTC

On 2022-11-19 16:05, ldries46 wrote:
> I do have a enumated type:
> type VALUE is (ABC, DEF, GHI, JKL, MNOP);
> Suppose I have a parameter with the value DEF is there a simple way to
> get the next value like you can with integers in the way of V2 := V1 + 1
> for instance OUT := NEXT( ABC).

Next value: VALUE'Succ (V1).
Previous value: VALUE'Pred (V1).

See http://www.ada-auth.org/standards/22rm/html/RM-3-5.html#I1732.

Subject	Author
Finding the next or the previous value in a enumerated type	ldries46
Re: Finding the next or the previous value in a enumerated type	Niklas Holsti