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Date: Sat, 10 Sep 2016 22:00:14 +0200
Message-ID: <CAA69SC4eOJ5=vviAzdZ+EbvRojFS-ZG7n6b-1Pk36g_fQzJcyw@mail.gmail.com>
To: Marco Pivetta <ocramius@gmail.com>
Cc: Larry Garfield <larry@garfieldtech.com>, Niklas Keller <me@kelunik.com>, 
	PHP Internals List <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=001a11494724290009053c2cb6d6
Subject: Re: [PHP-DEV] RFC - Immutable classes
From: marijic.silvio@gmail.com (=?UTF-8?Q?Silvio_Mariji=C4=87?=)

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I agree. Will add this feature to RFC also

Cheers
On Sep 10, 2016 8:02 PM, "Marco Pivetta" <ocramius@gmail.com> wrote:

> On Sat, Sep 10, 2016 at 7:49 PM, Niklas Keller <me@kelunik.com> wrote:
>
>> 2016-09-10 19:41 GMT+02:00 Silvio Mariji=C4=87 <marijic.silvio@gmail.com=
>:
>>
>> > @Fleshgrinder,
>> >
>> > While I'm not sure at the moment about CoW, I can agree that we should
>> add
>> > immutable keyword as a interface modifier to make sure all classes
>> > implementing must be immutable.
>>
>>
>> As interfaces can't have member variables, that doesn't make sense to me=
.
>>
>
> It still makes sense from a consumer perspective, so having the
> restriction in the contract is quite good.
>
> If you accept a `Number`, you expect to be able to serialize/de-serialize
> it, and you expect it to be "locked", immutable.
> If you let an implementation of `Number` to have mutable state in, then
> you break all the code that relies on `Number`.
> Note that it is still possible to break this though, so maybe we'd need
> some other modifiers about behavior too (pure function modifier?)
>
> immutable interface Number
> {
>     public function toFloat() : float;
> }
> immutable class RandomNumber implements Number
> {
>     public function toFloat() : float { return (float) random_int(1,
> 100000); /* yo, look at my global mutable hidden state! */ }
> }
>
> Requiring immutable values in consumers will likely improve code
> quality/safety and reduce dangerous assumptions, and it will probably als=
o
> allow for optimizations in the engine later on.
>
> Marco Pivetta
>
> http://twitter.com/Ocramius
>
> http://ocramius.github.com/
>
>

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