From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM
	autolearn=ham autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,5bfab93693a9feee
X-Google-Attributes: gid103376,public
X-Google-ArrivalTime: 2002-12-25 16:03:34 PST
Path: 
 archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!wn11feed!wn12feed!worldnet.att.net!204.127.198.203!attbi_feed3!attbi.com!rwcrnsc53.POSTED!not-for-mail
From: Stapler <spam.magnet@yahoo.com>
Subject: Re: parameter modes
Newsgroups: comp.lang.ada
References: <3e09fd53.18465812@news.freenet.de>
 <ZBoO9.304901$pN3.23457@sccrnsc03>
User-Agent: Pan/0.11.4 (Unix)
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit
X-Comment-To: "Jeffrey Creem" <jeff@thecreems.com>
Message-ID: <wHrO9.459852$P31.154990@rwcrnsc53>
NNTP-Posting-Host: 12.241.145.39
X-Complaints-To: abuse@attbi.com
X-Trace: rwcrnsc53 1040861020 12.241.145.39 (Thu, 26 Dec 2002 00:03:40 GMT)
NNTP-Posting-Date: Thu, 26 Dec 2002 00:03:40 GMT
Organization: AT&T Broadband
Date: Thu, 26 Dec 2002 00:03:40 GMT
Xref: archiver1.google.com comp.lang.ada:32309
Date: 2002-12-26T00:03:40+00:00
List-Id: <comp.lang.ada>

On Wed, 25 Dec 2002 15:32:57 -0500, Jeffrey Creem wrote:


> If you are just worried about run time efficiency then just don't worry
> about it. The compiler (any decent compiler (or even some bad ones I
> have used)) do the "right" thing with repect to making a copy or not.
> 
> The in, out, in out is not like the old pascal "var" mode.
> 
> If you really do need to force something specific on a case base case
> basis (for some reason other than efficiency) then probably something
> like access might be appropriate.
 

Do you know if it's possible within the Ada language to define an optional
compiler instruction or pragma that says something like this ...

	if memory_region < X_number_of_bytes then

		Pass_by_copy(memory_region, Destination);

	else

		Pass_by_access_type(memory_region);

	end if;


Just curious.

Stapler