I don't see a problem with manually calling an initialization method in the case where static initialization isn't good enough. Note in many cases where statics are used (such as Singleton's) that extra if() can be done very nicely.
Andi
At 05:35 PM 10/5/2004 -0700, Robert Silva wrote:
Well, its at the application level now because the language doesn't provide another alternative. Preferably, it would be at the system level. Your argument would be similar to saying that __construct should be explicit and called at the application level to initialize an object. Static classes may need initilization as well. This is modeled after C#'s static constructors and Java's static blocks. It also enables other classes to access complex static variables directly without going through a static method to initialize the property first. I agree that its not needed, but now that we have static class methods, it would be nice for the language to provide built in initialization facilities.
Bob
-----Original Message----- From: Noah Botimer [mailto:[EMAIL PROTECTED] Sent: Tuesday, October 05, 2004 4:57 PM To: Robert Silva Cc: [EMAIL PROTECTED] Subject: Re: [PHP-DEV] Static Constructors
Hi Robert,
I hate to sound like a pedant, but shouldn't anything like that be explicit? That is, do your own check for prerequisite class variables that need to be set in each static method? Maybe I'm missing the boat, but I'd say that it would be something that should be at the application level, rather than at the system/object-model level.
In your example:
... public static function WriteLine($value) { if (is_null(self::$logfile)) self::initialize(); ... }
public static initialize() { self::$logfile = fopen('log.txt', 'a'); } ...
Thanks, -Noah
Robert Silva wrote:
> I've put together a rough implementation of static constructors. I'd like to > get peoples thoughts about it then I'll either clean it up and submit it or > nuke it. Basically the class constructor __cconstruct (have any better > ideas?) is called upon the first access to any static property and marks the > class entry as initialized. > > <? > > class Logger { > public static $logfile = null; > > private static function __cconstruct() { > self::$logfile = fopen('log.txt', 'a'); > } > public static function WriteLine($value) { > $value .= PHP_EOL; > fputs(self::$logfile, $value, strlen($value)); > } > > } > > Logger::WriteLine('Static constructors'); > > ?> >
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