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Date: Sat, 07 Jul 2012 14:06:46 +0200
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Subject: Re: about the new Ada 2012 pre/post conditions
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Date: 2012-07-07T14:06:46+02:00
List-Id: <comp.lang.ada>

On 07.07.12 11:14, Dmitry A. Kazakov wrote:
> That the same function's behavior might be both defined and undefined.

The function's behavior is not affected by assertion checking:

A DbC function computes as if it its pre condition were true.

Whatever the caller is going to pass to sqrt, the function sqrt corresponds
to a sequence of instructions that compute a value from a float argument
that is taken to be >= 0.0.  Reason: it was stated in the contract.

"shocking at first to many, it is among the method's main contributions
to software reliability and deserves emphasis." (OOSC2, � 11.6)