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From: "J-P. Rosen" <rosen@adalog.fr>
Newsgroups: comp.lang.ada
Subject: Re: Ada 2012 and Unicode package (UTF-nn encodings handling)
Date: Sat, 21 Aug 2010 09:01:53 +0200
Organization: Adalog
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Date: 2010-08-21T09:01:53+02:00
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Le 20/08/2010 23:38, Yannick Duchêne (Hibou57) a écrit :
> Time for my stupid question of the day :)
A question is never stupid. Answers sometimes...

> I could not avoid two questions: why no UTF-32 ? (this would not be an
> implementation nightmare)
I still fail to see the benefit of encoding 31 bits values into 32 bits
values...
And even if implementation is not a nightmare, it always has a cost.
Implementers are reluctant to spend money for features that nobody will
use. (Wide_Wide_Character was forced on us by ISO).

> and why BOM handled for each string while BOM
> is to be used at stream/file level ? (see XML or HTML files for
> example).
A package provides functionnalities. It should not presume how it is
used. Since this package is clearly in the "string handling" class, it
makes sense to handle this with strings.

For files, the usage is to have a BOM on the first line of the file. The
way the functions are defined makes it easy to not process the first
line specially; see the use case in the AI.


-- 
---------------------------------------------------------
           J-P. Rosen (rosen@adalog.fr)
Visit Adalog's web site at http://www.adalog.fr