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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Newsgroups: comp.lang.ada
Subject: Re: Q: type ... is new String
Date: Mon, 04 Jun 2012 22:28:29 +0200
Organization: Ada @ Home
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Date: 2012-06-04T22:28:29+02:00
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Le Mon, 04 Jun 2012 19:05:18 +0200, Dmitry A. Kazakov  =

<mailbox@dmitry-kazakov.de> a =C3=A9crit:
>> This may be a consequence of the attitude in the web,
>> which does not normally use "type" at all. Not at the level of
>> system integration, where it matters. The AI job, then, is to look
>> at the forms and try to make sense, even when things are malformed.
>> REJECT is not an option.
>
> Yes, this is a consequence of a misconception.

At least HTML5 addresses this, as it specifies malformed input handling.=


> Note that *exactly* same
> misconception is behind dynamic preconditions of Eiffel now unfortunat=
ely
> introduced in Ada 2012.

There's nothing wrong with it, and it does not betray Ada's spirit, as i=
t  =

helps to catch errors as much soon as possible. When an error is not (or=
  =

cannot be) caught at compile time, that's still better to catch it the  =

sooner at runtime, rather than after a long chain of consequences which =
 =

hides the error origination. That's what dynamic check of contracts is  =

for. After all, we have runtime range=E2=80=91check, since Ada's birth, =
which is  =

similar.

I don't understand your frequent griefs against runtime check of  =

contracts. Anyway, this does not prevent anyone to statically prove a  =

program with SPARK (or may be Coq) if one is able to. If you can't, you =
 =

just still have the option of runtime checking contracts, which is bette=
r  =

than nothing.

-- =

=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