Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:23979
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Date: Wed, 7 Jun 2006 20:52:56 +0200
Reply-To: Marcus Boerger <helly@php.net>
Message-ID: <762216350.20060607205256@marcus-boerger.de>
To: Ilia Alshanetsky <ilia@prohost.org>
Cc: internals@lists.php.net
In-Reply-To: <286CF0DE-43A7-4987-8AE4-97FEE62A1A5A@prohost.org>
References: <286CF0DE-43A7-4987-8AE4-97FEE62A1A5A@prohost.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Subject: Re: [PHP-DEV] Clone Operations
From: helly@php.net (Marcus Boerger)

Hello Ilia,

  hello should be printed. As in you cannot outsmart what some people
might do in their code. For example in C++ such stuff gets optimized
out but only as long as the compiler detects that doing so does not
result in a different bahvior. This is something you need to know
for particular stuff in c++ like the ability of some compilers that
can optimized out implicit clone on function return - but only if the
compiler would generate the clone....ok, now back to php, do we really
want to make it that complex? I think if the programmer writes clone
or it is a consequnce of something else then let the clone happen and
the rule end there.

best regards
marcus

Wednesday, June 7, 2006, 3:56:44 PM, you wrote:

> When it comes to "empty" clone statements, should they be executed  
> and then free the result (current behavior) or avoid clone all together.
> For example when class x { function __clone() { echo "hello"; } }  
> clone new x(); code is executed, should it print hello or not print  
> anything at all, treating the clone operation as a NOOP?

> Current behavior calls clone and then frees the result, meaning that  
> "hello" is printed, but I am uncertain that this is the correct  
> behavior, any comments?

> Ilia Alshanetsky




Best regards,
 Marcus