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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Silly and stupid post-condition or not ?
Date: Sun, 05 Feb 2012 03:49:41 +0100
Organization: Ada @ Home
Message-ID: <op.v86p43rdule2fv@douda-yannick>
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Date: 2012-02-05T03:49:41+01:00
List-Id: <comp.lang.ada>

Le Sun, 05 Feb 2012 00:07:31 +0100, Stephen Leake  =

<stephen_leake@stephe-leake.org> a =C3=A9crit:
> Nothing in this declaration says it's a _valid_ dart_score. But it wou=
ld
> be helpful for the comment to include the notion of invalid scores:
>
>     Dart_Score : Natural range 1 .. 60;
>     -- Holds the score for a single dart. Note that not all scores in
>     -- this range are possible on a standard dart board.
>
> So this uses part Ada and part natural language to specify the
> actual constraints.
>
> The original post condition was:
>
>    function Parsed (S : String) return Parsed_Type
>       with Post =3D>
>         (if S'Length not in Image_Length_Type then
>             Parsed'Result.Status =3D Format_Error);
>          -- There may be other failure conditions.
>
> I was ignoring the comment; it's pretty weak. I would improve it:
>
>    function Parsed (S : String) return Parsed_Type
>       with Post =3D>
>         (if S'Length not in Image_Length_Type then
>             Parsed'Result.Status =3D Format_Error);
>    -- There are other failure conditions indicated by
>    -- Parsed'Result.Status =3D Format_Error.
>

I feel you are right about the comment, it was too easy to miss. I tend =
to  =

like conciseness, but may be to much conciseness disallow the expected  =

emphasis in some cases.

-- =

=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