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From: Martin Krischik <martin@krischik.com>
Newsgroups: comp.lang.ada
Subject: Re: String Pointer Bug
Date: Tue, 09 Nov 2004 20:35:00 +0100
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Date: 2004-11-09T20:35:00+01:00
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skidmarks wrote:

> "Christoph Karl Walter Grein" <AdaMagica@web.de> wrote in message
> news:<mailman.83.1099920902.10401.comp.lang.ada@ada-france.org>...
>> A long time ago, I made an exegesis of this problem. You may find it
>> below (sorry if the indentation should be lost, it's my mailer that
>> swallows it, I do not know to avoid this):
> 
> Thank you. This is an excellent description. the only (fault) that I
> can see is that it requires a copy operation (Y: aliased D := X).
> 
> I wonder, do you think that:
> 
>    Y: aliased D; for Y'Address use X'Address;
> 
> is a viable alternative (please note, I did not say GOOD alternative).

for Y'Address use X'Address; is an form of Unchecked_Unchecked_Conversion or
on C++ talk a reinterpret_cast - the kind of convertion where no,
absolutely no, check is done. Is is a solution where either performace is
on the essence or nothing else goes.

But yes it is a solution. Viable? Well, your decision. 

With Regards

Martin

PS: I did use Y'Address use X'Address; once for converting C <-> Ada strings
where I wanted better performace then Interfaces.C.

-- 
mailto://krischik@users.sourceforge.net
http://www.ada.krischik.com