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Date: Thu, 10 Nov 2016 12:18:30 +0000
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To: Levi Morrison <levim@php.net>
Cc: Niklas Keller <me@kelunik.com>, "Christoph M. Becker" <cmbecker69@gmx.de>, 
	=?UTF-8?Q?Micha=C5=82_Brzuchalski?= <michal@brzuchalski.com>, 
	PHP Internals List <internals@lists.php.net>
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Subject: Re: [PHP-DEV] [RFC][VOTE] Object typehint
From: pthreads@pthreads.org (Joe Watkins)

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Morning Levi,

> There is a future compatibility issue of this same type with `object`:

If that is an issue, it is for future RFC's to deal with.

Cheers
Joe


On Thu, Nov 10, 2016 at 12:12 PM, Levi Morrison <levim@php.net> wrote:

> On Thu, Nov 10, 2016 at 2:11 AM, Niklas Keller <me@kelunik.com> wrote:
> > 2016-11-09 21:53 GMT+01:00 Christoph M. Becker <cmbecker69@gmx.de>:
> >
> >> On 09.11.2016 at 17:28, Joe Watkins wrote:
> >>
> >> >     I want to explain why I voted no on this:
> >> >
> >> >     I think it's significantly less useful without variance, varianc=
e
> is
> >> > something that is usually difficult to achieve in PHP, but not for
> this
> >> > feature in particular.
> >>
> >> Can you please elaborate what you mean with variance?  I see some
> >> practical use cases for covariance of a method with return type object=
,
> >> but I don't see how contravariance could be achieved for parameters of
> >> type object.
> >>
> >> If your suggestion is only about invariance of object return types, I'=
m
> >> not sure if this very special case would make sense (for consistency
> >> reasons).
> >>
> >
> > We already have it for iterable -> array. We would have it for all othe=
r
> > types if there wouldn't be an implementation issue.
> >
> > Regards, Niklas
> >
> > Cheers,
> >> Christoph
> >>
> >> >     I absolutely want it, but I want it to be properly useful.
> >> >
> >> >     If the RFC were halted and patched to include variance, I'd +1 i=
t.
> >> >
> >> > Cheers
> >> > Joe
> >> >
> >> > On Sun, Nov 6, 2016 at 5:28 PM, Micha=C5=82 Brzuchalski
> <michal@brzuchalski.
> >> .com>
> >> > wrote:
> >> >
> >> >> Hi everyone,
> >> >>
> >> >> Two weeks have passed since this RFC was put to discussion here.
> >> >>
> >> >> Therefore, I'm going to put it to a vote for inclusion in PHP 7.2.
> >> >>
> >> >> Voting starts today, 2016-11-06, and will close after two weeks on
> the
> >> >> Sunday 2016-11-20 at midnight.
> >> >>
> >> >> The RFC and voting widget can be found here:
> >> >> https://wiki.php.net/rfc/object-typehint
> >> >>
> >> >> It's a normal 2/3 majority required vote.
> >> >>
> >> >> Thanks!
> >> >> --
> >> >> regards / pozdrawiam,
> >> >> --
> >> >> Micha=C5=82 Brzuchalski
> >> >> about.me/brzuchal
> >> >> brzuchalski.com
> >> >>
> >> >
> >>
> >>
> >> --
> >> PHP Internals - PHP Runtime Development Mailing List
> >> To unsubscribe, visit: http://www.php.net/unsub.php
> >>
> >>
>
> In a return type context `iterable` can be changed to `Traversable` or
> `array`; it cannot be changed to `Collection` as we cannot guarantee
> at compile-time that `Collection` implements Traversable.
>
> There is a future compatibility issue of this same type with `object`:
> right now the only user-definable types are objects. However, enums
> are an often requested feature and they may not be objects. Thus we
> wouldn't be able to guarantee that `Foo` is an object. There is a
> draft RFC with a patch for enums and expect it will come to a
> discussion soon, so I don't think we'll have to wait very long to know
> the answer here.
>

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