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Date: Thu, 25 Mar 2010 08:48:50 -0500
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Subject: Re: [PHP-DEV] horizontal reuse: traits vs. grafts
From: dsp@php.net (David Soria Parra)

Just as a general idea (which is certainly something after traits are implemented once)

Scala offers stackable traits so that you can mixin traits during object creation.
An example:

trait Philosophical {
    public function think () {
        echo "Cogito ergo sum";
    }
} 

trait Drink {
    public function drink () {
        echo "gluck gluck"
    }
}

$obj = new Person();

$obj->think(); // will fail

$obj = new Person() with Philosophical;
$obj->think(); // works

$obj = new Person() with Philsophical, Drink;
$obj->drink(); // works
$obj->think(); // works

This approach is taken in scala and works pretty fine there for composing classes
during runtime and should be douable in PHP too. For sure aliasing is not
possible in this example.

But as said just a general idea that I might try to work on once traits are comittet.

Stefan what do you think about "stackable traits" ?

  - David