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From: =?iso-8859-15?Q?Yannick_Duch=EAne_=28Hibou57=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Ada noob here! Is Ada widely used?
Date: Mon, 07 Jun 2010 14:56:54 +0200
Organization: Ada At Home
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Date: 2010-06-07T14:56:54+02:00
List-Id: <comp.lang.ada>

Le Mon, 07 Jun 2010 13:13:18 +0200, Georg Bauhaus  =

<rm.dash-bauhaus@futureapps.de> a =E9crit:
> DbC, however, has to do with designing components of the ship.
> You can have rescue clauses (exception handlers)
> in DbC.
Yes, DnC is rather part of design than part of the application.

This may not be perfect (words to Dmitry), while this still help to focu=
s  =

on design.

BTW, nobody claimed DbC as proposed for Ada 2012 was sufficient to prove=
 a  =

program.

Ada also has an expected role in pedagogy, and DbC can help it to play  =

this role. I believe this way of DbC is most likely to attract people th=
an  =

a more strict one (two teachers here said even students tend to avoid  =

designing... so try to figure what the crowd's behavior can be) like SPA=
RK  =

(which is neither perfect for some practical reasons although it perfect=
ly  =

sounds). The important fact is that it is a step toward without any step=
  =

backward. I neither believe the proposed DbC will ever bloat Ada or give=
  =

it any weakness holes. I agree with you (still talking to Dmitry), when =
 =

you complain, as an example, generics comes with numerous troubles ;  =

however, if a comparison was to be made, we will probably see Ada's DbC =
 =

will comes with far less troubles (in the program proof area) than  =

generics which are already there from long. There is no reason to focus =
on  =

Ada 2012 DbC as a potential source of trouble.

May be an opportunity to ask (a second time) for a question I have in  =

mind: will SPARK (in the future) get benefit from Ada's DbC annotations =
?

-- =

There is even better than a pragma Assert: a SPARK --# check.
--# check C and WhoKnowWhat and YouKnowWho;
--# assert Ada;
--  i.e. forget about previous premises which leads to conclusion
--  and start with new conclusion as premise.