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Date: Thu, 17 Nov 2016 15:25:22 +0000
Message-ID: <CAL=_i_n9-Yw0G37b5P8S-qpOEMk+CEnpsAeDua=ZHT3fB-vq3A@mail.gmail.com>
To: Nikita Popov <nikita.ppv@gmail.com>
Cc: "Christoph M. Becker" <cmbecker69@gmx.de>, Craig Duncan <php@duncanc.co.uk>, Niklas Keller <me@kelunik.com>, 
	Internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=001a114275bc4a063d054180cc36
Subject: Re: [PHP-DEV] How to detect classes with a count_elements handler in userland?
From: pthreads@pthreads.org (Joe Watkins)

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Afternoon,

A change in convention makes sense, and sounds much nicer than hacking
anything to make it work.

I do prefer this approach to yet-another-function.

Is changing convention all we would do though, or would we raise a warning
when handler is present and interface is not ?

Cheers
Joe

On Thu, Nov 17, 2016 at 11:49 AM, Nikita Popov <nikita.ppv@gmail.com> wrote:

> On Thu, Nov 17, 2016 at 8:30 AM, Joe Watkins <pthreads@pthreads.org>
> wrote:
>
>> Morning,
>>
>> Just to chime in ... can you split the PR into the RFC, and the new thing
>> please.
>>
>> Just another question on how we could make objects that have
>> count_elements (which is in object handlers) implement an interface on the
>> class entry (which is detached from handlers) ?
>>
>
>> I'm sure it's doable, but it doesn't look very straight forward, some
>> kind of hacking in instanceof maybe ... not sure ...
>>
>
> I don't think this needs any magic. We simply implement the interface by
> convention. Just like you are supposed to implement Traversable if you're
> implementing get_iterator. Similarly you should implement Countable if
> you're using count_elements.
>
> Nikita
>

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