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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: SPARK
Date: Thu, 13 May 2010 02:52:07 +0200
Organization: Ada At Home
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Date: 2010-05-13T02:52:07+02:00
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Le Thu, 13 May 2010 00:55:02 +0200, Yannick Duch=C3=AAne (Hibou57)  =

<yannick_duchene@yahoo.fr> a =C3=A9crit:
> Hope this first question will get a short answer, so let us jump to th=
e  =

> second question, which is intended to start with one major deal of SPA=
RK  =

> for people who know/use Ada : Ada subset and restrictions (not to  =

> disclaim or disagree with, mostly to talk and understand more).

An important quote every one should know about ; especially the last  =

sentence:

[Praxis SPARK 95 (5)]
> Some readers may be dismayed to see so many features of Ada removed,
> and feel that SPARK is =E2=80=9Ctoo small=E2=80=9D. It is by no means =
the largest
> subset of Ada which would be amenable to analysis by the techniques
> employed in SPADE, but it is significantly larger than SPADE-Pascal,
> which has been found adequate for a substantial number of
> safety-critical projects. The additional features which appear in
> SPARK (such as packages and private types) make programming simpler
> and safer, rather than complicate the verification task. Of course,
> the extent to which Ada must be simplified for high-integrity
> programming will be a matter of opinion: our preoccupation with
> simplicity is based on experience of what can be achieved with a
> high degree of confidence in practice, rather than what can be
> proved in principle.


-- =

pragma Asset ? Is that true ? Waaww... great