Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:785
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Reply-To: zeev@zend.com
Message-ID: <5.1.0.14.2.20030408133219.05b16140@localhost>
Date: Tue, 08 Apr 2003 13:37:04 +0300
To: Sterling Hughes <sterling@bumblebury.com>
Cc: internals@lists.php.net
In-Reply-To: <1049764010.24472.618.camel@hasele>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed
Subject: Re: [PHP-DEV] [PATCH] Allow constant expressions
From: zeev@zend.com (Zeev Suraski)
References: <1049764010.24472.618.camel@hasele>

Nice patch, but one problem - it allows users to use constants as a part of 
those expressions...  Since the values of those are not known until compile 
time, we have an issue there.  Technically we can disallow such constants 
from being used in those expressions, but I'm not sure how well we can 
explain this (you can use constants, but not in expressions?)  I don't 
know, maybe it's an ok thing to say.

Zeev

At 04:06 08/04/2003, Sterling Hughes wrote:
>Hi,
>
>The attached patch allows constant expressions within class variables
>and constants.  I came into this problem when I wanted the following
>sequence:
>
>class foo {
>     const A = 1<<0;
>     const B = 1<<1;
>     const C = 1<<2;
>}
>
>And the current parser doesn't allow such rules.  I therefore added the
>attached patch which allows operators to be used on constants within
>these expressions (and also within array declarations).  This is
>achieved by folding statements such as '1<<0' into their equivalent
>values at compile time.  The following operators are supported: << >> |
>& + - * / . % ^ ~ xor
>
>Please review it, and let me know if its ok to commit. :)
>
>-Sterling
>
>--
>"People can have the Model T in any colour -- so long as it's black."
>     - Henry Ford
>
>--
>PHP Internals - PHP Runtime Development Mailing List
>To unsubscribe, visit: http://www.php.net/unsub.php