Re: [PHP-DEV] Operator overloading for userspace objects

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January 28, 2020 23:59 ("Michael Cordover")
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: > > * __toInteger(): int > * __toFloat(): float > > Then, in any mathematical context, PHP could call the appropriate > method and use the number returned in the calculation.
I don't think this is enough to make operator overloading useful, even without mutation. 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. - mjec