From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM
	autolearn=ham autolearn_force=no version=3.4.4
X-Google-Thread: 103376,ad06d2d7cb045687
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,UTF8
Received: by 10.68.238.198 with SMTP id vm6mr15097338pbc.3.1328047978329;
        Tue, 31 Jan 2012 14:12:58 -0800 (PST)
Path: 
 lh20ni246253pbb.0!nntp.google.com!news1.google.com!news3.google.com!proxad.net!feeder1-2.proxad.net!usenet-fr.net!gegeweb.org!aioe.org!.POSTED!not-for-mail
From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
 =?utf-8?Q?=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re:
 =?utf-8?B?U2lsbHkgYW5kIHN0dXBpZCBwb3N04oCRY29uZGl0aW9uIG9yIG5vdMKgPw==?=
Date: Tue, 31 Jan 2012 23:12:57 +0100
Organization: Ada @ Home
Message-ID: <op.v8yynv17ule2fv@douda-yannick>
References: <op.v8w6ptk5ule2fv@douda-yannick>
 <1p9stpwo0k4ma$.1hznr6by4cbdt$.dlg@40tude.net>
NNTP-Posting-Host: ORlngJW8mt48EkB5K/HOIA.user.speranza.aioe.org
Mime-Version: 1.0
X-Complaints-To: abuse@aioe.org
User-Agent: Opera Mail/11.61 (Linux)
X-Notice: Filtered by postfilter v. 0.8.2
Content-Type: text/plain; charset=utf-8; format=flowed; delsp=yes
Content-Transfer-Encoding: Quoted-Printable
Date: 2012-01-31T23:12:57+01:00
List-Id: <comp.lang.ada>

Le Tue, 31 Jan 2012 18:28:54 +0100, Dmitry A. Kazakov  =

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

> On Tue, 31 Jan 2012 00:11:43 +0100, Yannick Duch=C3=AAne (Hibou57) wro=
te:
>
>>     type Parsed_Type (Status : Parsed_Status_Type) is record
>>        case Status is
>>           when Parsed =3D>
>>              Instance : Instance_Type;
>>           when Format_Error =3D>
>>              null;
>>        end case;
>>     end record; -- Parsed_Type
>>
>>     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.
>
> Returning the discussion from the astral spheres back to the topic. A
> better design could be to split Format_Error into Length_Error and oth=
er
> errors. Then for Parsed the postcondition would become complete for on=
e
> case: if and only if S'Length not in Image_Length_Type then the result=
 is
> Length_Error.

Could be an idea if the program could make use of this extra information=
.  =

But it won't, a program won't fix an erroneous image received as input, =
 =

and a Length_Error will result in the same behavior as with a Format_Err=
or  =

result.

-- =

=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