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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Newsgroups: comp.lang.ada
Subject: Re: Generic-Package Elaboration Question / Possible GNAT Bug.
Date: Wed, 23 Nov 2011 04:49:42 +0100
Organization: Ada @ Home
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Date: 2011-11-23T04:49:42+01:00
List-Id: <comp.lang.ada>

Le Tue, 22 Nov 2011 16:02:06 +0100, Georg Bauhaus  =

<rm.dash-bauhaus@futureapps.de> a =C3=A9crit:
> [1] http://www.eiffel.com/developers/design_by_contract_in_detail.html=

Oops, not good for its claims, an exemple DbC=E2=84=A2 use case in this =
page is  =

erroneous:

> it will look as follows in Eiffel syntax, as part of a genericclass  =

> DICTIONARY [ELEMENT]:
>
> put (x: ELEMENT; key: STRING) is
> 		-- Insert x so that it will be retrievable through key.
> 	require
> 		count <=3D capacity
> 		not key.empty
> 	do
> 		... Some insertion algorithm ...
> 	ensure
> 		has (x)
> 		item (key) =3D x		count =3D old count + 1
> 	end
The post-condition may fails, while the pre-condition was fulfilled  =

(unless class DICTIONARY is weird). At least, a good candidate for a  =

legitimate exception raise :p

-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D  [Ep=
igrams on  =

Programming =E2=80=94 Alan J. =E2=80=94 P. Yale University]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [Idem]