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Date: Tue, 2 Oct 2007 15:02:29 +0200
To: Sebastian Bergmann <sb@sebastian-bergmann.de>
Subject: Re: [PHP-DEV]  Class Posing
From: dz@bitxtender.com (=?ISO-8859-1?Q?David_Z=FClke?=)

would it be possible to overload final classes?

- David


Am 02.10.2007 um 11:32 schrieb Sebastian Bergmann:

>  From [1]:
>
>    Objective-C permits a class to wholly replace another class  
> within a
>    program. The replacing class is said to "pose as" the target class.
>    All messages sent to the target class are then instead received by
>    the posing class.
>
>    There are several restrictions on which classes can pose:
>
>      * A class may only pose as one of its direct or indirect
>        superclasses.
>
>      [The other restrictions do not apply to PHP]
>
>  Earlier this year, Johannes implemented class posing for PHP as  
> follows:
>
>    <?php
>    class Foo {}
>    class Bar extends Foo {}
>
>    function new_overload($className)
>    {
>        if ($className == 'Foo') {
>            return new Bar;
>        }
>
>        // ...
>    }
>
>    $o = new Foo;
>    // $o is an object of Foo.
>
>    register_new_overload('new_overload');
>
>    $o = new Foo;
>    // $o is an object of Bar.
>    ?>
>
>  We (Johannes, Marcus, Sara, and myself) then discussed where to  
> put this
>  functionality. Outside of core, there were two places that both make
>  sense: pecl/operator and pecl/runkit.
>
>  However, to make this a viable mechanism that can be used in tools  
> such
>  as PHPUnit (for which I could really use this functionality), we  
> agreed
>  that it actually belongs into the core.
>
>  Opinions? Needless to say that I would love to see this in PHP  
> 5.3 ;-)
>
>  --
>  [1] http://en.wikipedia.org/wiki/Objective_C#Posing
>
> -- 
> Sebastian Bergmann                          http://sebastian- 
> bergmann.de/
> GnuPG Key: 0xB85B5D69 / 27A7 2B14 09E4 98CD 6277 0E5B 6867 C514  
> B85B 5D69
>
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