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From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
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Subject: Re: Is there a way to see if a value is declared as a constant
Date: Mon, 13 Sep 2021 20:48:40 +0200
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On 9/13/21 7:08 PM, ldries46 wrote:
> 
> In what way do I test if C is a constant and not another record Item

function X (C : in Record_Item) return Record_Item with
    Pre => C = C1 or C = C2 or C = C3 or C = C4 or C = C5;

Of course, if you have a lot of constants with more descriptive names, the 
precondition will be hard to read. If you had a constant array it would be more 
readable:

Pre => (for some A of Allowed_Values => C = A);

-- 
Jeff Carter
"You've got the brain of a four-year-old boy,
and I bet he was glad to get rid of it."
Horse Feathers
47