Re: [Discussion] Callable types via Interfaces

Hi Nicolas, wt., 25 kwi 2023, 19:00 użytkownik Nicolas Grekas < nicolas.grekas+php@gmail.com> napisał: > Hi all, > > > > https://wiki.php.net/rfc/allow_casting_closures_into_single-method_interface_implementations > > > > > > https://wiki.php.net/rfc/allow-closures-to-declare-interfaces-they-implement > > https://wiki.php.net/rfc/structural-typing-for-closures > > > Thanks Larry for the nice introduction to those ideas. > > Personally, I feel like going with adding Closure::castTo() might provide > the most immediate benefit. I expanded the rationale on the corresponding > RFC and added more examples. I'd appreciate it if all of you reading could > have another look to see if that helps to better understand the proposal. > > strtr(...)->castTo(TranslatableInterface::class) is one example of RFC #1 > function ($message, $parameters) implements TranslatableInterface is RFC #2 > > Both RFCs nicely combine together to cover many cases of typed callabled. > > Then RFC#3 is a bit more adventurous (according to our understanding) but > still desirable as it's essentially about allowing the engine to > tentatively call castTo() from RFC#1 when a closure is passed as argument > while an interface is expected. > Personally I don't like this way of shaping callable types. Given examples are really confusing me. Call of a castTo() with argument representing an interface with a method is confusing as the method magically appears on a closure without explicit binding to it! What if an interface has more than one method? What if I wanna choose which one? For me personally this goes into wrong direction. Cheers, Michał Marcin Brzuchalski >