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Date: Wed, 01 Feb 2012 14:49:14 +0100
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Date: 2012-02-01T14:49:14+01:00
List-Id: <comp.lang.ada>

Le Wed, 01 Feb 2012 11:37:31 +0100, <stefan-lucks@see-the.signature> a  =

=C3=A9crit:
> Back to the original poster's question:
>
>>>  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.
>
> What is special about that specific failure condition that singles it =
out
> from all other failure conditions?
Hard and tedious (very tedious) to define in the language of expressions=
  =

in a postcondition, but still handily defined in a human language or oth=
er  =

dedicated formal notations. The failure condition expressed here, is  =

simply an easy and obvious one. That's also a useful one, because if the=
  =

client don't know how much to read, based on this postcondition, it know=
ns  =

that going above Image_Length_Type'Last is of no use. This is important =
 =

for defining constraints for buffers and strings receiving inputs.


-- =

=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