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To: internals Mailing List <internals@lists.php.net>
Message-ID: <483AE0FD-EF65-45D9-ACC4-AE3692A83EFE@gmail.com>
Subject: Re: [PHP-DEV] RFC WeakRefs
From: rowan.collins@gmail.com (Rowan Collins)

On 18 May 2018 13:15:21 BST, Etienne Kneuss <colder@php=2Enet> wrote:
>On Fri, May 18, 2018 at 1:59 PM Rowan Collins <rowan=2Ecollins@gmail=2Eco=
m>
>wrote:
>
>> On 17 May 2018 10:35:11 BST, Etienne Kneuss <colder@php=2Enet> wrote:
>> >That said, if the plan is to subsume pecl-weakref, I suggest we also
>> >reimplement weakmaps, which offer a convenient way of storing
>> >meta/cache
>> >data and is not implementable in userland without trade-offs=2E
>>
>> It looks to me like WeakMap would be fairly trivial to implement in
>> userland as a combination of WeakRef, ArrayAccess, Iterable, and an
>> internal SplObjectStorage for the ability to use objects as keys
>(although
>> I'm not clear why it uses object keys in the first place)=2E
>>
>
>In weakmaps it is the keys that are weak, hence objects only; the
>values
>are arbitrary data associated with them=2E
>The goal is to provide a way to associate metadata that may also be
>collected in case the key gets collected=2E
>In some sense it would behave as if this metadata was stored as a
>property
>of the object, only it is stored externally in a weakmap=2E

Ah, that makes more sense; there didn't seem to be any accrual description=
 in the manual of what they were for; maybe I was looking in the wrong plac=
e=2E In that case, I understand your request to include it, and apologise f=
or the noise :)

Regards,

--=20
Rowan Collins
[IMSoP]