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Date: Wed, 7 Sep 2016 20:44:27 +0200
Message-ID: <CAA69SC7wzKc2djTX267gaVpKd5-28H_GwAq2UBpzpRrqUfjpKQ@mail.gmail.com>
To: "Christoph M. Becker" <cmbecker69@gmx.de>
Cc: Mathieu Rochette <mathieu@rochette.cc>, Nikita Popov <nikita.ppv@gmail.com>, internals@lists.php.net, 
	Andrea Faulds <ajf@ajf.me>, php-lists@koalephant.com, 
	=?UTF-8?Q?Micha=C5=82_Brzuchalski?= <michal@brzuchalski.com>
Content-Type: multipart/alternative; boundary=94eb2c05f7f8982721053bef4dcd
Subject: Re: [PHP-DEV] RFC - Immutable classes
From: marijic.silvio@gmail.com (=?UTF-8?Q?Silvio_Mariji=C4=87?=)

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@Fleshgrinder

I will make changes that if immutable objects are being compared that they
will be compared by value rather then hash
On Sep 7, 2016 8:27 PM, "Christoph M. Becker" <cmbecker69@gmx.de> wrote:

> On 07.09.2016 at 20:11, Fleshgrinder wrote:
>
> > On 9/7/2016 8:57 AM, Micha=C5=82 Brzuchalski wrote:
> >
> >> AFAIK CoW in case of objects would be impossible to implement.
> >
> > Nothing is impossible. :)
> >
> > We have full access to the real object inside of zend_std_write_propert=
y
> > and can easily clone it, perform the desired changes and return without
> > affecting anyone.
> >
> > I am not 100% sure how to do this without fiddling around a bit.
> >
> > @nikic and @afaults: I am really sorry to bother you both but you guys
> > simply know the PHP source endlessly good. What do you think, would it
> > be possible to implement copy-on-write for an object as we have it with
> > our scalar and compound types?
> >
> >     final class A {
> >       public $p;
> >     }
> >
> >     $a =3D new A;
> >     $b =3D $a;
> >
> >     var_dump($a =3D=3D=3D $b); // bool(true)
> >
> >     $b->p =3D 1;
> >
> >     var_dump($a =3D=3D=3D $b); // bool(false)
> >
> > It's only about writing to existing properties.
>
> Ah, good old PHP 4, see <https://3v4l.org/VaD1W#v5328>. :-)
>
> --
> Christoph M. Becker
>
>

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