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Date: Tue, 22 Nov 2005 21:45:01 +0100
Message-ID: <00A2E2156BEE8446A81C8881AE117F192C1C4E@companyweb>
Thread-Topic: AW: [PHP-DEV] PDM Meeting Notes
Thread-Index: AcXvpByPotDDVX7JQkGNpLmI9MDzrwAADPzw
To: "Rasmus Lerdorf" <rasmus@lerdorf.com>
Cc: "internals" <internals@lists.php.net>
Subject: AW: AW: [PHP-DEV] PDM Meeting Notes
From: mp@webfactory.de ("Matthias Pigulla")

Now that was a quick reply :)

> Also known as runtime inheritance, or late binding.  It's not a new=20
> thing, we have it today.  The discussion was about whether to=20
> have a way=20
...

That is, one can write=20
if (...) class A extends X {} else class A extends Y {}=20
right now? Seriously ;)?

Every now and then I'm surprised what weird sort of stuff is allowed in
PHP :), but most probably you don't really want to write this sort of
code in the first place? ;)

> Just like any other signature in an instance, it tells anything that=20
> implements the interface that it must have a constructor and that=20
> constructor must meet the definition in the interface.  Useful for=20
> object factories.  In most cases you don't want to force a specific=20
> constructor in which case you wouldn't specify it in the=20
> interface, but=20
> I see no reason why you shouldn't be allowed to specify it=20
> there if you=20
> want to.

The point is that interfaces are nothing you could anything with - that
is, if you have "something" that implements an interface, it has already
been constructed. You never construct instances through an interface
(you would have to choose an implementation, the interface isn't one)...
I just cannot explain it in a better way ;) It's somewhat similar to
that you cannot make static calls on interfaces.

Maybe someone could explain what they intend to use it for and what they
suspect it to do ;)?

-mp.