Re: Who's HOFs on first?

https://github.com/ReactiveX/RxJava had to solve this, you may want to
investigate their approach.

On Tue, Nov 10, 2015 at 2:51 PM Michael Bayne <[email protected]> wrote:

> I'm working on a library that aims to be usable from various JVM languages
> (Scala, Java, Kotlin, eventually more), and the API contains higher-order
> functions. Ideally I'd like such calls to use the "natural" expression of
> HOFs for each language and not require the use of adapter functions.
>
> There are two routes that seem appealing:
>
> 1. Use Scala's FunctionN types and hope that the roadmap entry "Turn
> FunctionN into Functional Interfaces, so that Java 8 code can call
> higher-order methods in Scala without a wrapper." eventually happens.
>
> 2. Use Java's Function/Predicate etc. types and hope that eventually all
> of the situations where code works with Scala functions but doesn't work
> for SAMs eventually get ironed out. (This is the approach I tried initially
> and then backed out of because it was making the library too annoying to
> use from Scala.)
>
> I couldn't find an issue in JIRA tracking the progress of #1, nor any
> information about it on the Interwebs other than the single line in the
> roadmap, so maybe even considering that option is foolish.
>
> I'm just seeking advice, from anyone who is in the trenches on this front,
> on which is likely to be the approach least fraught with pain and
> frustration (I'm already deeply aware of the reality that trying to write
> non-trivial code for use by multiple JVM languages is a road paved with
> pain and frustration, so I'm not pointing fingers here).
>
> Thus far, I've managed to achieve the worst of both worlds by having
> overloaded versions of HOF-taking methods, one with Scala's function types
> and one with Java's. Java and Kotlin are fine with that because Scala's
> types are not SAMs and so they ignore them, but scalac freaks out about
> this in a wide variety of circumstances. I'd prefer to move away from this
> approach so that my (written in Scala) library is not annoying to use from
> Scala.
>
> Thanks!
>
> -- [email protected]
>
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