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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
 =?utf-8?Q?=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Class wide preconditions: error in the Ada 2012 Rationale?
Date: Mon, 05 Nov 2012 21:43:01 +0100
Organization: Ada @ Home
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Date: 2012-11-05T21:43:01+01:00
List-Id: <comp.lang.ada>

Le Mon, 05 Nov 2012 21:41:48 +0100, Yannick Duch=C3=AAne (Hibou57)  =

<yannick_duchene@yahoo.fr> a =C3=A9crit:

> I have a doubt, and this one disturb me, so this topic.
>
> I was reading the revised version (fourth draft) of the Ada 2012  =

> Rationale, when I saw this:
>
>> However, the rules regarding preconditions are perhaps surprising.
>> The specific precondition Pre for Equilateral_Triangle must be true =

>> (checked in the body) but so long as just one of the class wide =

>> preconditions Pre'Class for Object and Triangle is true then all iswe=
ll.
>
> Then later, a summary of the rule:
>
>> In summary, class wide preconditions are checked at the point of call=
. =

>> Class wide postconditions and both specific pre- and postconditionsar=
e  =

>> checked in the actual body.
>

Oh no! I forget the link:
http://www.ada-auth.org/standards/12rat/html/Rat12-2-3.html

Pardon me.

-- =

=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