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Date: Thu, 5 Apr 2007 11:38:34 +0800
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References: <b9339a730704042032t29eab073ob4f489099ecc717a@mail.gmail.com>
Subject: Re: abstract static function
From: diogin@gmail.com ("Jingcheng Zhang")

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Sorry, I've forgotten the "extends" keywords in the example codes:

<?php
abstract class Dispatcher {
    abstract public static function dispatch();
    public static function exampleMethod() {
        ...
    }
}
final class ActionDispatcher extends Dispatcher {
    public static function dispatch() {
        parent::exampleMethod();
        // other code...
    }
}
final class AjaxDispatcher extends Dispatcher {
    public static function dispatch() {
        parent::exampleMethod();
        // other code...
    }
}
?>

2007/4/5, Jingcheng Zhang <diogin@gmail.com>:
>
> Hi internals,
>     I used to use abstract static function prior to php 5.2, because when
> I consider static class as a singleton, I can use abstract static function
> to delay the implementation of some methods to the derived classes. This
> happens, for example, when I declare a parent dispatcher, and extend it into
> two classes - action dispatcher and ajax dispatcher - and declare them
> static as I want to keep them a singleton because they are just application
> models, not domain models:
>
> <?php
> abstract class Dispatcher {
>     abstract public static function dispatch();
>     public static function exampleMethod() {
>         ...
>     }
> }
> final class ActionDispatcher {
>     public static function dispatch() {
>         parent::exampleMethod();
>         // other code...
>     }
> }
> final class AjaxDispatcher {
>     public static function dispatch() {
>         parent::exampleMethod();
>         // other code...
>     }
> }
> ?>
>     Unfortunately, since php 5.2, although it does still allow declaring
> static methods in an interface, it simply generates a message when declaring
> abstract static functions with error_reporting set to E_ALL | E_STRICT.
>     PHP is a dynamic language, not static as C++ and Java. So, why not
> allow abstract static functions? It is also a good way to support singleton
> natively.
>     Waiting for explanations. Thanks :)
>
> --
> Best regards,
> Jingcheng Zhang
> Room 304, Dormitory 26 of Yuquan Campus, Zhejiang University
> P.R.China




-- 
Best regards,
Jingcheng Zhang
Room 304, Dormitory 26 of Yuquan Campus, Zhejiang University
P.R.China

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