Are there interfaces associated with overloadable operators? E.g. a `Plus` for the `plus()` method. ...

# announcements

[mp]

Are there interfaces associated with overloadable operators? E.g. a Plus for the plus() method. It would be great to be able to define sum() on an Iterable<Plus>, for instance.

[Andreas Sinz]

no

[nwh]

There is no such thing, as far as I know. Of course, you could make it yourself and define an extension method for Iterable<Plus>, but it wouldn't support types you don't create yourself. There is a proposal right now to add the ability to extend existing classes, which would allow what you're looking for

[Andreas Sinz]

easiest way to do that is using ad-hoc polymorphism http://beust.com/weblog/2016/06/20/ad-hoc-polymorphism-in-kotlin/

[mp]

I’ll take a look, thanks. I’m spoiled by Rust…

[nwh]

https://github.com/47deg/KEEP/pull/6

[Andreas Sinz]

@mp sadly the java-interop made things abit harder as they should be

[mp]

Understandable