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From: Simon Wright <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: Contracted exceptions for Ada
Date: Tue, 11 Dec 2007 20:50:07 +0000
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Date: 2007-12-11T20:50:07+00:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:

> On Mon, 10 Dec 2007 20:25:34 +0000, Simon Wright wrote:
>
>> The Ariane IV system engineers said to themselves, and probably in
>> the design documentation, "The maximum horizontal velocity is
>> X. Therefore the conversion to the fixed-point type _Whatever_
>> cannot overflow. Therefore we do not need to handle exceptions for
>> this conversion, so (given we are short of CPU power) we will not
>> do any extra processing to avoid exceptions."
>>
>> Not sure they would have recognised "contract" in that context.
>
> Yes, my premise was that the type of H_Input changed from Ariane IV
> to Ariane V. In this case translation of the conversion function
> H_Input_To_Whatever could refute the second "therefore" because X
> would not be the maximal possible value of H_Input anymore.

X was *never* the maximum possible value of H_Input!