On Tue, Nov 16, 2010 at 6:46 PM, Simas Toleikis <sim...@gmail.com> wrote:
> Hello,
>
> I was just skimming through Traits RFC document on the wiki trying to find
> a
> practical use for them. The first thing that comes to my mind is a
> Singleton
> implementation - this is where I found myself literally "copying" most of
> the code in the past. As far as I know there is no way to implement this
> pattern properly in PHP without duplicate code (due to lack of multiple
> inheritance/templating).
>
> Unfortunately, the same RFC document mentions this for trait methods:
>
> The static modifier is not supported, because it would change the methods
> > semantics and references to $this would break.
> >
>
> .. and that pretty much defeats Singleton-Trait implementation. Is there
> any
> particular technical/design reasons why traits can't handle $this inside
> static methods just like regular static methods do (with a fatal error)?
>
> p.s. a Singleton-Trait implementation could look like:
>
> trait Singleton {
> public static function getInstance() { ... }
> }
>
> class Child extends Parent {
> use Singleton;
> }
>
> Child::getInstance();
>
for reusable singleton pattern with php 5.3
http://www.slideshare.net/fabpot/design-patternrevisitedphp53
slide 11 and 12
Tyrael
