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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: How do I write directly to a memory address?
Date: Tue, 8 Feb 2011 02:16:44 -0800 (PST)
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Date: 2011-02-08T02:16:44-08:00
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Georg Bauhaus wrote on comp.lang.ada:
> On 2/8/11 9:04 AM, Ludovic Brenta wrote:
>
>> BTW, like I said, *every* time I look at C code, I see a bug. In your
>> case, foo has undefined behavior if countdown is negative.
>
> You took the bait. =A0 Fine.
>
> Strict contracts in subprogram profiles. Ha!
>
> void foo2(int jump)
> =A0 =A0/* make sure jump % 2 =3D=3D 0! */
> {
> =A0 =A0 ...
>
> }
>
> Write that in Ada 2005 to demonstrate the glorious power of
> your subtype constraints. =A0When was it that compilers will
> support aspects reliably?

Easy:

procedure Foo2 (Jump : in Natural);
-- Jumps by 2 * Jump

Thereby eliminating the very *possibility* that 2*jump can be odd!

--
Ludovic Brenta.