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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: for S'Image use Func??
Date: Fri, 07 May 2010 17:19:14 +0200
Organization: Ada At Home
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Date: 2010-05-07T17:19:14+02:00
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Le Fri, 07 May 2010 14:27:35 +0200, Robert A Duff  =

<bobduff@shell01.theworld.com> a =C3=A9crit:

> "Randy Brukardt" <randy@rrsoftware.com> writes:
>
>> I actually don't buy the need for the Assert pragma in the first plac=
e:  =

>> such
>> checks are rarely expensive and thus should simply be part of the cod=
e
>> always.
>
> If they're not expensive, then you're not using it enough.  ;-)
Hihi, nice

> Also, the other advantage of pragma Assert over an Assert
> procedure is that you can put the pragma in declarative parts
> and package specs.
That's what I like to do too : define Assert pragmas in package spec, so=
  =

that it can be used to derive some property in the implementation or in =
 =

some other part of the specification. This express coherence between som=
e  =

elements or other things (there are things which cannot be expressed wit=
h  =

type properties), on which you can rely to say =E2=80=9Cthis and this, i=
s valid,  =

because of that (the Assert pragma somewhere)=E2=80=9D. I find it useful=
 to safely  =

drop some runtime check whenever something must be fast or is looped  =

thousands of times, or even simply to be sure something is OK (no need f=
or  =

execution speed requirements to wish that). If the assumptions are wrong=
  =

and so what is derived from these too, well, the package simply raise an=
  =

exception at elaboration instead of behaving oddly.

-- =

No-no, this isn't an oops ...or I hope (TM) - Don't blame me... I'm just=
  =

not lucky