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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: How do I write directly to a memory address?
Date: Wed, 9 Feb 2011 20:18:37 -0600
Organization: Jacob Sparre Andersen Research & Innovation
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Date: 2011-02-09T20:18:37-06:00
List-Id: <comp.lang.ada>

"Georg Bauhaus" <rm-host.bauhaus@maps.futureapps.de> wrote in message 
news:4d5116d1$0$7657$9b4e6d93@newsspool1.arcor-online.net...
...
> Strict contracts in subprogram profiles. Ha!

Software that doesn't have them is garbage. Period. Even in Ada.

> void foo2(int jump)
>   /* make sure jump % 2 == 0! */
> {
>    ...
> }
>
> Write that in Ada 2005 to demonstrate the glorious power of
> your subtype constraints.  When was it that compilers will
> support aspects reliably?

Can't be done. It illustrates my point that even Ada doesn't have enough 
support for non-garbage software.

But Ada 2012 can do it:

subtype Odd_Natural is Natural with Dynamic_Predicate => Odd_Natural mod 2 
/= 0;

   procedure Foo2 (Jump : Odd_Natural) is ...

A call
   Foo2(2);
will raise Assertion_Error because the predicate fails.

There are also static predicates, which of course could be checked at 
compile-time with static operands. This isn't in that form, however.

                                     Randy.