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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Newsgroups: comp.lang.ada
Subject: Re: Design by contract and control inversion
Date: Wed, 07 Nov 2012 02:34:58 +0100
Organization: Ada @ Home
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Date: 2012-11-07T02:34:58+01:00
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Le Fri, 02 Nov 2012 09:59:53 +0100, Yannick Duch=C3=AAne (Hibou57)  =

<yannick_duchene@yahoo.fr> a =C3=A9crit:
>      -- abc-sets-base.ads
>
>      generic
>
>         type Element_Type is private;
>         type Cardinal_Type is (<>);
>
>      package ABC.Sets.Base is

As it was posted, a note on this.

The `Cardinal_Type` is just a discrete type here, which may looks  =

over=E2=80=91generalized to somebodies, and indeed the standard Ada cont=
ainers use  =

a range type instead. The discrete type is enough even for a  =

implementation, but if you wish to add pre/post condition on the  =

cardinality in the specification, then a discrete type becomes a burden =
 =

(unless you enjoy Peano arithmetic a lot). There's no real rule here, th=
at  =

just depends=E2=80=A6 Just still one thing: that's always OK to change f=
rom the  =

discrete type to a range type, but not the opposite; so that may be bett=
er  =

to start with the discrete type and change this later if required.


-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D [1]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [1]
[1]: Epigrams on Programming =E2=80=94 Alan J. =E2=80=94 P. Yale Univers=
ity