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Date: Mon, 12 Dec 2016 11:48:48 -0800 (PST)
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Subject: Re: Ada 2012 Constraints (WRT an Ada IR)
From: Shark8 <onewingedshark@gmail.com>
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Xref: news.eternal-september.org comp.lang.ada:32764
Date: 2016-12-12T11:48:48-08:00
List-Id: <comp.lang.ada>

On Monday, December 12, 2016 at 10:39:28 AM UTC-7, Dmitry A. Kazakov wrote:
> On 2016-12-12 16:31, G.B. wrote:
> > On 12/12/2016 09:27, Dmitry A. Kazakov wrote:
> >
> >>> I.e., the programmer writing Y (X (A, B)) has ensured that
> >>> the assumption expressed as X'Pre is actually true before
> >>> calling X.
> >>
> >> So what? Programmers program programs, and how is that related to
> >> contracts etc?
> >
> > Informing is contracts' primary purpose,
>=20
> Nope. The contract's purpose is to constrain contracted parties.=20
> Informing is the purpose of E-mail, newspaper etc...

They aren't exactly mutually exclusive -- consider electronic components, t=
hey have a data-sheet that both informs you of their limitations and operat=
e within prescribed bounds when those conditions are met. (Absent manufactu=
ring defects and wear-out, obviously.)