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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Newsgroups: comp.lang.ada
Subject: Re: Silly and stupid post-condition or not ?
Date: Fri, 03 Feb 2012 12:40:36 +0100
Organization: Ada @ Home
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Date: 2012-02-03T12:40:36+01:00
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Le Fri, 03 Feb 2012 12:09:10 +0100, Dmitry A. Kazakov  =

<mailbox@dmitry-kazakov.de> a =C3=A9crit:

> On Fri, 03 Feb 2012 10:48:34 +0100, Yannick Duch=C3=AAne (Hibou57) wro=
te:
>
>> Le Fri, 03 Feb 2012 10:12:25 +0100, Dmitry A. Kazakov
>> <mailbox@dmitry-kazakov.de> a =C3=A9crit:
>>> In the OP example,
>>> Format_Error of unspecified semantics is to be used heavily.
>>
>> Format_Error as a specified semantic: Error. Which turns to disallow =
any
>> access to any parsed Instance.
>
> If that is *the semantics* then the prostcondition is
>
>    Result.Status =3D Format_Error =3D> Result.Instance raise Constrain=
t_Error

Format_Error is a possible value of a discriminant. The postcondition  =

applies to the Image function. I see no way to drift from the latter to =
 =

the former. I understood you asked me what is the meaning of the value  =

Format_Error, not what is the meaning of the postcondition.

> which is of Ada's variant record type. Are you designing compiler test=
s?
Excuse me, I don't understand.


-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D [1]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [1]
[1]: Epigrams on Programming =E2=80=94 Alan J. =E2=80=94 P. Yale Univers=
ity