> Is there a reason why traits can't be used to introduce generics?
> i.e. extending the code that composes the trait into the class to
> replace the generic type? eg. in zend_add_trait_method?
> (I couldn't quickly find where trait properties get added, even
> though my example is for properties.)
>
> trait GenericTrait<T>
> {
> private ?T $object = null;
> }
>
> class ComposableClass
> {
> use GenericTrait<Foo>;
> }
>
> // Result:
> class ComposedClass
> {
> private ?Foo $object = null;
> }
>
> Just a random thought...
>
> Regards,
> radar3301
I worked with Joe Watkins to do a proof-of-concept for generic traits.
It's a bit old since it's from 2017, but could be a useful starting
point if you are serious about pursuing this idea:
https://github.com/php/php-src/compare/master...morrisonlevi:php-src:parameterized_traits