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Date: Tue, 27 Nov 2018 17:49:07 +0100
Message-ID: <CABdc3WoBP8D32kJJvhVVhdQ1dVDe6m142byswkBEHGXri_nYHQ@mail.gmail.com>
To: Levi Morrison <levim@php.net>
Cc: PHP Internals List <internals@lists.php.net>
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Subject: Re: [PHP-DEV] [RFC][Discuss] Covariant return- and contravariant
 parameter- types
From: michal@brzuchalski.com (=?UTF-8?Q?Micha=C5=82_Brzuchalski?=)

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Can't wait for it to happen!
Thank you for your work and fixing object type.

pon., 26 lis 2018 o 22:26 Levi Morrison <levim@php.net> napisa=C5=82(a):

> I am happy to announce my latest RFC, [Covariant Returns and
> Contravariant Parameters][1], is open for discussion. If you do not
> recognize those terms then hopefully the introduction coupled with the
> [examples][2] will help. Here is one snippet that demonstrates
> covariant return types:
>
> <?php
> interface Repository {
>   function fetch(int $id): ?Entity;
> }
>
> class UserFactory implements Repository {
>   function fetch(int $id): ?UserEntity {
>     /* Since UserEntity is an Entity, this is now allowed */
>     /* ... implementation ... */
>   }
> }
> ?>
>
> Covariant return types and contravariant parameter types are highly
> requested features; here are a few of the bug reports:
>
>   * https://bugs.php.net/bug.php?id=3D71825
>   * https://bugs.php.net/bug.php?id=3D72442
>   * https://bugs.php.net/bug.php?id=3D75385
>   * https://bugs.php.net/bug.php?id=3D75823
>
> There is a [preliminary implementation][3] that is available. It will
> not be rebased during discussion to allow people to check out the code
> and get updates without worrying about it breaking. The code quality
> can definitely be improved, and there are still a few todo comments in
> the code.
>
> Please do not discuss the items found in [Future Scope][4] as part of
> this thread, which includes discussing types such as `mixed`,
> `scalar`, `numeric`, etc.
>
> I look forward to your feedback, and especially with your
> experimentation with the implementation.
>
> Levi Morrison
>
>   [1]:
> https://wiki.php.net/rfc/covariant-returns-and-contravariant-parameters
>   [2]:
> https://wiki.php.net/rfc/covariant-returns-and-contravariant-parameters#e=
xamples
>   [3]:
> https://github.com/php/php-src/compare/master...morrisonlevi:variance2
>   [4]:
> https://wiki.php.net/rfc/covariant-returns-and-contravariant-parameters#f=
uture_scope
>
> --
> PHP Internals - PHP Runtime Development Mailing List
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>

--=20
regards / pozdrawiam,
--
Micha=C5=82 Brzuchalski
about.me/brzuchal
brzuchalski.com

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