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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: Thu, 8 Dec 2016 11:03:04 +0100
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Date: 2016-12-08T11:03:04+01:00
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On 08/12/2016 10:42, G.B. wrote:
> On 08.12.16 09:57, Dmitry A. Kazakov wrote:
>> The proper way to do this is elevate the check into the behavior and
>> contract an exception.
>
> What will these two parts look like in the example,
> bothrelating to "+", and to Plus?
>
> procedure Plus is
>    Y : Standard.Integer := Standard.Integer'Last;
> begin
>    Y := Y + 1;
> end Plus;

The contract of Plus is can [or must] raise Constraint_Error.

If the client will prove absence of Constraint_Error it must handle that 
anytime Plus is called.

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