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Message-ID: <C9F26D21-D0E2-4378-9364-BD9ED28F2668@benramsey.com>
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Date: Tue, 28 Jan 2020 18:06:52 -0600
In-Reply-To: <a085604a-adb2-4b7d-bf6a-b61636955c94@www.fastmail.com>
Cc: jan.h.boehmer@gmx.de,
 internals@lists.php.net
To: Michael Cordover <mjec@mjec.net>
References: <00ea01d5d630$b18d4f20$14a7ed60$@gmx.de>
 <55C25E7C-596F-46E8-A812-A7DF86A17546@benramsey.com>
 <a085604a-adb2-4b7d-bf6a-b61636955c94@www.fastmail.com>
Subject: Re: [PHP-DEV] Operator overloading for userspace objects
From: ben@benramsey.com (Ben Ramsey)

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> On Jan 28, 2020, at 17:55, Michael Cordover <mjec@mjec.net> wrote:
>=20
> On Tue, Jan 28, 2020, at 18:47, Ben Ramsey wrote:
>> If you take mutation off the table, then things become easier, IMO. =
We
>> only need two magic methods:
>>=20
>> * __toInteger(): int
>> * __toFloat(): float
>>=20
>> Then, in any mathematical context, PHP could call the appropriate
>> method and use the number returned in the calculation.
>=20
> I don't think this is enough to make operator overloading useful, even =
without mutation.
>=20
> For example, the result of TimeInterval(1, 'ms') + TimeInterval(3, =
'days') requires more information that we'd get out of __toInteger or =
__toFloat, but could still be a useful operation to perform, and ought =
to return a new TimeInterval (not an int). There are many of these =
tagged-number types where overloading would be helpful.


I just remembered this extension from a few years back. It=E2=80=99s no =
longer maintained, but it might help your efforts: =
https://github.com/php/pecl-php-operator

Cheers,
Ben


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