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=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID
	autolearn=no autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: fac41,2c6139ce13be9980
X-Google-Attributes: gidfac41,public
X-Google-Thread: f43e6,2c6139ce13be9980
X-Google-Attributes: gidf43e6,public
X-Google-Thread: 1108a1,2c6139ce13be9980
X-Google-Attributes: gid1108a1,public
X-Google-Thread: 103376,3d3f20d31be1c33a
X-Google-Attributes: gid103376,public
From: jsa@alexandria.organon.com (Jon S Anthony)
Subject: Re: Safety-critical development in Ada and Eiffel
Date: 1997/07/24
Message-ID: <JSA.97Jul24162314@alexandria.organon.com>#1/1
X-Deja-AN: 258591482
Distribution: world
References: <JSA.97Jul23143311@alexandria.organon.com>
 <EDswrJ.Jq1@syd.csa.com.au>
Organization: PSINet
Newsgroups: comp.object,comp.software-eng,comp.lang.ada,comp.lang.eiffel
Date: 1997-07-24T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <EDswrJ.Jq1@syd.csa.com.au> donh@syd.csa.com.au (Don Harrison) writes:

> :> :That's neat. Except that a postcondition will be part of the contract
> :> :(i.e. specification) for the routine, so the caller will know what to 
> :> :expect. Your code is part of the implementation.
> :> 
> :> I agree - it's belongs in a contract.
> :
> :That is trivial to provide:
> :
> :function Do_Something_Within_Time_Slice (
> :    ...
> :    Duration_Before_Abort : Our_Duration_Limits := 0.010;
> :    ...
> :    ) return Whatever_Type;
>
>  Sorry, I don't see how this acheives anything resembling the Eiffel
> contract..

Who cares about the "Eiffel contract"???  The "Eiffel contract" is no
where to be seen in this sub-discussion.  BFD to the "Eiffel
contract".  The fact is, this is a contract with the client which
describes the piece of possible behavior in question.

Actually, I don't even think you can express this sort of capability
in direct Eiffel.  So, that point is moot (yes, Robert, I know this is
an abuse of "moot" :-)

/Jon
-- 
Jon Anthony
OMI, Belmont, MA 02178
617.484.3383
"Nightmares - Ha!  The way my life's been going lately,
 Who'd notice?"  -- Londo Mollari