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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada,fr.comp.lang.ada
Subject: Re: Press Release - Ada 2012 Language Standard Approved by ISO
Date: Wed, 19 Dec 2012 09:33:01 +0100
Organization: cbb software GmbH
Message-ID: <7wrdmbre6jw9.qww9l0uzj6mg.dlg@40tude.net>
References: <kap6v8$mr7$1@dont-email.me>
 <wcc8v8vti17.fsf@shell01.TheWorld.com>
 <CCF68CB9.22EB9%yaldnif.w@blueyonder.co.uk>
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Date: 2012-12-19T09:33:01+01:00
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On Tue, 18 Dec 2012 21:12:25 +0000, Bill Findlay wrote:

> On 18/12/2012 16:57, in article wcc8v8vti17.fsf@shell01.TheWorld.com,
> "Robert A Duff" <bobduff@shell01.TheWorld.com> wrote:
> 
>> dirk@vana.cs.kuleuven.be. (Dirk Craeynest) writes:
>> 
>>> Ada 2012 brings significant enhancements to Ada, most notably in the
>>> area of "contract-based programming."  New features here include the
>>> ability to specify preconditions and postconditions for subprograms,
>>> and invariants for private (encapsulated) types.
>> 
>> Why does everybody neglect predicates, which are more important
>> than pre/post/invariant?
> 
> A bit of fun with a predicate:
[...]

Take an instance of Ada.Numerics.Discrete_Random and do:

   subtype More_Fun_Number is Integer with
      Dynamic_Predicate => Random = More_Fun_Number;

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de