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Subject: Re: [PHP-DEV] RFC: Functional Interfaces
From: dmitry@zend.com (Dmitry Stogov)

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On 04/19/2016 03:52 PM, Joe Watkins wrote:
> Oh, it's confusing text in the RFC, using the word "Interface" ... 
> that's meant as a placeholder for InterfaceName.
>
> Cheers
> Joe
>
> On Tue, Apr 19, 2016 at 1:50 PM, Joe Watkins <pthreads@pthreads.org 
> <mailto:pthreads@pthreads.org>> wrote:
>
>     Morning Dmitry,
>
>       In your example, they will do the same thing.
>
>       Anon classes don't have lexical scope, I have a patch for that,
>     and an RFC, I'm just tidying it.
>

OK. so this is not just a syntax sugar, but if you implement lexical 
scope for anonymous classes it's going to be sugar. Right?
May be it's better to start from classes first?

>
>       Even when anon classes do have lexical scope, there is value in
>     being able to implement these kinds of interfaces using only a
>     function.
>

What value? just shorter syntax? or anything else?

>
>       The changes to the vm are restricted to a few lines, that's not
>     seriously a problem, is it !?
>

I hope no. I didn't understand all details of proposal and I didn't take 
a deep look into the code.

>
>       I don't see where I extend closure with an interface ...
>

I meant new field zend_execute_data *interface in zend_closure structure.
I thought the same might be implemented through anonymous classes.

Thanks. Dmitry.

>
>       >     zend_do_inheritance_ex(type, zend_ce_closure, 1);
>       >     zend_class_implements(type, 1, interface);
>
>     Cheers
>     Joe
>
>     On Tue, Apr 19, 2016 at 1:01 PM, Dmitry Stogov <dmitry@zend.com
>     <mailto:dmitry@zend.com>> wrote:
>
>         <?php
>         interface IFoo {
>             public function method() : int;
>         }
>
>         $cb1 = function () implements IFoo : int {
>             return 42;
>         };
>
>         $cb2 = new class implements IFoo {
>           function method() : int {
>             return 42;
>          }
>         };
>         ?>
>
>         Are $cb1 and $cb2 going to be the same (do the same)?
>         Is this just a new syntax sugar, or a really new feature?
>
>         According to implementation, I think, you shouldn't extend
>         "zend_closure" with "interface".
>         If this is a sugar, lets implement it as a sugar (without VM
>         changes).
>
>         But may be I didn't understand the idea at all :)
>
>         Thanks. Dmitry.
>
>
>         ________________________________________
>         From: Joe Watkins <pthreads@pthreads.org
>         <mailto:pthreads@pthreads.org>>
>         Sent: Monday, April 18, 2016 13:22
>         To: PHP internals
>         Subject: [PHP-DEV] RFC: Functional Interfaces
>
>         Morning Internals,
>
>             Please review the following RFC:
>
>         https://wiki.php.net/rfc/functional-interfaces
>
>             An implementation is provided, and is testable on 3v4l.
>
>             Review of the implementation from those of you that do
>         that would be
>         good :)
>
>         Cheers
>         Joe
>
>
>


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