Re: [RFC] Readonly properties

From: Date: Fri, 04 Jun 2021 15:34:33 +0000
Subject: Re: [RFC] Readonly properties
References: 1  Groups: php.internals 
Request: Send a blank email to internals+get-114730@lists.php.net to get a copy of this message 
Le 04/06/2021 à 17:19, Nikita Popov a écrit :

Hi internals,

I'd like to open the discussion on readonly properties:
https://wiki.php.net/rfc/readonly_properties_v2

This proposal is similar to the
https://wiki.php.net/rfc/write_once_properties RFC that has been declined
previously. One significant difference is that the new RFC limits the scope
of initializing assignments. I think a key mistake of the previous RFC was
the confusing "write-once" framing, which is both technically correct and
quite irrelevant.

Please see the rationale section (
https://wiki.php.net/rfc/readonly_properties_v2#rationale) for how this
proposal relates to other RFCs and alternatives.

Regards,
Nikita

Hello,


I like this RFC, but I have a question:


Specifying an explicit default value on readonly properties is also not allowed:


Does that mean I wouldn't be allowed to write something such as:

<?php

class Point {


    public function __construct(



        public readonly int $x = 0,



        public readonly int $y = 0,



    ) {}


}


$foo = new Point(x: 12);

?>

Because the readonly+promoted+named combo is very powerful but if you can't assign defaults it makes it much less interesting.

Regards,

--

Pierre

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