Scala function literals (or any function literal) derive from a particular set of traits. It may be java classes are able to implement these traits (nobody that i know attempted to do that), and then maybe they will become supported as scala function types. But i think even that is a big if, since scala compiler tinkers with bytecode a lot, and compatibility at bytecode level is not guaranteed between scala major releases. Bottom line, even if it is possible to write scala functions in java, it is definitely not publicly documented feature.
On the other hand, it is possible to use "function-like" Colt classes such as DoubleDoubleFunction just like a plain old reference-type object from either scala or Java, which is exactly how it happens in the example given in the question originally asked. On Thu, Sep 25, 2014 at 12:24 AM, Ted Dunning <ted.dunn...@gmail.com> wrote: > On Wed, Sep 24, 2014 at 11:09 PM, Dmitriy Lyubimov <dlie...@gmail.com> > wrote: > > > Aggregate is Colt's thing. Colt (aka Mahout-math) establish java-side > > concept of different function types which are unfortunately not > compatible > > with Scala literals. > > > > Dmitriy, > > Is this because we have other methods that describe the characteristics of > the function? > > What would be the Scala friendly idiom? Additional traits? >
