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From: Steve Furlong <sr.furlong@pti-us.com.nospam>
Subject: Re: Papers on the Ariane-5 crash and Design by Contract
Date: 1997/03/23
Message-ID: <3335D3AC.9B8@pti-us.com.nospam>#1/1
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References: <332B5495.167EB0E7@eiffel.com> <tz8ohcjv7cc.fsf@aimnet.com>
 <332D113B.4A64@calfp.co.uk> <tz8g1xtzx9y.fsf@aimnet.com>
 <milkweed-1803970737590001@port3.chester.smallmedia.com>
 <5gm8a6$2qu$2@news.irisa.fr> <3332BE49.8F9@lmtas.lmco.com>
 <33330FE5.3F54BC7E@eiffel.com> <JSA.97Mar21204525@alexandria>
 <333438B5.ABD322C@eiffel.com>
 <milkweed-2203971952320001@port9.chester.smallmedia.com>
To: Anders Pytte <milkweed@plainfield.bypass.com>
Organization: Internet MCI
Newsgroups: 
 comp.lang.eiffel,comp.object,comp.software-eng,comp.programming.threads,comp.lang.ada
Date: 1997-03-23T00:00:00+00:00
List-Id: <comp.lang.ada>


Anders Pytte wrote:
> 
> In article <333438B5.ABD322C@eiffel.com>, Bertrand Meyer
> <bertrand@eiffel.com> wrote:
> 
> In a few hours my team developed much of the functionality of Eiffel's
> assertions (certainly the most essential functionality) for our C++
> project by using macros. With minor changes, I could apply them to the
> problem suggested by Bertrand as follows. Show me how this will not work,
> please!
> 
> The macros, which can offcourcse be turned on or off according to compile
> switches:
> 
> ENTER: Sets up data structures to register requires by name so they can
> override requires of the same name in calls to inherited method.
> 
> REQUIRE, ENSURE, INVARIANT: Registers name (check to see if overridden)
> and handles false expression with exception, program break, or other
> means.
> 
> EXIT: Cleans up data structures created by ENTER and calls CheckInvariants().

<<snip an example>>
 
> I would prefer using Eiffel, but I agree with Jon Anthony that the same
> practices (use of assertion for design by contract) are available from
> alternative languages. Getting this concept across to Eiffel language
> fiends can be exasperating!


PLEASE make these macros available. I've failed to raise interest in 
Eiffel or Ada instead of C++, so now I'm trying to bring some of their 
better features to our C++ code.


Thanks,
Steve Furlong