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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Ada 2012 Constraints (WRT an Ada IR)
Date: Sun, 11 Dec 2016 16:40:59 +0100
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Date: 2016-12-11T16:40:59+01:00
List-Id: <comp.lang.ada>

On 2016-12-11 14:31, G.B. wrote:
> On 11/12/2016 13:28, Dmitry A. Kazakov wrote:
>>> so that the caller
>>> knows what to do about a and b and the implementation of `remainder`
>>> can assume it's been done?
>>
>> That does not translate to me into anything.
>
> Seeing
>
>     function X (A, B: T) return T;
>
> I can write
>
>      Y (X (A => any of T, B => any of T));
>
> Seeing
>
>     function X (A, B: T) return T
>       with Pre => A > B;
>
> I must first establish A > B before calling X,
> because "Pre" tells me so.

I still do not understand you question about caller "doing things" with 
parameters. Caller passes parameters that's all.

> How much should a function declaration tell a programmer about
> the relation between parameters A and B in the following?

Remainder is not a relation. Relation is a Boolean-valued function.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de