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From: Shark8 <onewingedshark@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: How do I write directly to a memory address?
Date: Tue, 8 Feb 2011 14:35:10 -0800 (PST)
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Date: 2011-02-08T14:35:10-08:00
List-Id: <comp.lang.ada>

On Feb 8, 2:46=A0pm, Georg Bauhaus <rm-host.bauh...@maps.futureapps.de>
wrote:
> On 2/8/11 9:21 PM, Shark8 wrote:
>
> >> void foo2(int jump)
> >> =A0 =A0 /* make sure jump % 2 =3D=3D 0! */
> >> {
> >> =A0 =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?
>
> > Okay.
> > Procedure Foo( Jump : In Integer ) is
>
> -- =A0make sure jump mod 2 =3D=3D 0 *before* calling this function
>
> You'd need a formal type in Foo's signature that lets the client
> see what values can be supplied =A0without having to look at the body.
> A first approximation is a precondition:
>
> =A0 =A0 procedure Foo2 (Jump : in Integer)
> =A0 =A0 =A0 with Pre =3D> (Jump mod 2 =3D 0)
> =A0 =A0 is
> =A0 =A0 =A0 ...
>
> A type in Ada 2012 can use an Invariant aspect referencing
> an expression function,
>
> =A0 =A0 type Even is range -12 .. 345 with
> =A0 =A0 =A0 Invariant =3D> Is_Even (Even);
>
> =A0 =A0 function Is_Even (E : Even) return Boolean is
> =A0 =A0 =A0 =A0(E mod 2 =3D 0);
>
> Then,
>
> =A0 =A0 procedure Foo2 (Jump : in Even);
>
> seems a much better approximation of the C comment.

Nifty; but he *did* specify using Ada 2005...