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Date: Tue, 16 Dec 2014 22:48:52 -0200
Message-ID: <CAFp73XtbFXAUpNE6fKFMLO8uq80hD-5perXfFs8dKY=MG0SqZA@mail.gmail.com>
To: Rowan Collins <rowan.collins@gmail.com>
Cc: Stanislav Malyshev <smalyshev@gmail.com>, PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=001a11c1fa9828c8ac050a5ed8c0
Subject: Re: [PHP-DEV] [RFC][VOTE] Objects as Keys
From: guilhermeblanco@gmail.com ("guilhermeblanco@gmail.com")

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> On Tue, Dec 16, 2014 at 9:39 AM, Matteo Beccati <php@beccati.com>
wrote:Hi Guilherme,
>
>> On 16/12/2014 12:34, Guilherme Blanco wrote:
>> Hi,
>> All I can say is that the lack of this feature is one of the main
reasons why Doctrine doesn't fully work with composite keys.
>> With this enhancement it would now become possible to implement a proper
IdentityMap.
 >
>Are you sure you haven't misinterpreted the RFC?

Hi Matteo,

I did not. You may think I mentioned IdentityMap as entity map, but I'm
talking about entityPersister mapping or resultPointers consumptions that
happens inside Doctrine throughout the execution. Entity IdentityMap is
enough to use purely spl_object_hash(). We should focus on the main goal
here, which is complex structures as keys.

As a very complex library developer I do see lots of use cases for this.

[]s,


On Tue, Dec 16, 2014 at 6:52 PM, Rowan Collins <rowan.collins@gmail.com>
wrote:
>
> On 16 December 2014 18:50:06 GMT, Stanislav Malyshev <smalyshev@gmail.com>
> wrote:
> >Hi!
> >
> >> Explicit conversion is trivial, just call whatever method you like.
> >> Sure, you can't write (int)$obj, but $obj->toInt() is just as
> >> expressive.
> >
> >Exactly the same applies to __toString and whole ArrayAccess, yet we
> >still have them. Avoiding boilerplate code helps. Especially if
> >boilterplate code would look like:
> >
> >if(is_object($foo)) {
> >  $foo_key = $foo->toInt();
> >} else {
> > $foo_key = $foo;
> >}
> >$a[$foo] = 1;
> >
> >Doing it each time is annoying.
>
> I was just confused by your statement that "explicit conversion is
> inacessible from userspace". But yeah, I guess with string keys you can
> just write $a[(string)$foo] and assume/hope it will do something meaningful
> whatever the type of $foo.
>
>
>
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>
>

-- 
Guilherme Blanco
MSN: guilhermeblanco@hotmail.com
GTalk: guilhermeblanco
Toronto - ON/Canada

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