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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Practicalities of Ada for app development
Date: Mon, 11 Jun 2012 16:43:45 +0200
Organization: cbb software GmbH
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Date: 2012-06-11T16:43:45+02:00
List-Id: <comp.lang.ada>

On Mon, 11 Jun 2012 16:27:30 +0200, Georg Bauhaus wrote:

> On 11.06.12 10:22, Dmitry A. Kazakov wrote:
>> On Sun, 10 Jun 2012 23:36:46 +0200 (CEST), Nomen Nescio wrote:
>> 
>>> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote:
>>>>
>>>>> Please, why have you defined Code_Point as a modular type?
>>>>
>>>> Because code point is unsigned. When you declare something signed
>>>> you do that because you want negative inverses. Signed integers have
>>>> the base type with 0 in the middle of its range.
>>>
>>> That's no reason to use mod.  You can put boundaries where you want
>>> them, integer, or mod.
>>>
>>> It's about the operators.
>> 
>> Exactly, there is *no* arithmetic of code points.
> 
> In case there is no arithmetic of code points, it is really
> surprising to see
> 
>    type Code_Point is mod 2**32;
> 
> and not
> 
>    type Code_Point is private;

Code points are numeric:

http://en.wikipedia.org/wiki/Unicode

As I wrote, I considered Wide_Wide_Character, which also partially
implements the interface of code point. I used modular interface instead
because numeric literals seem more important for code points than character
literals.

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