Probably being thick... I need to construct a boxed inline class from Java (well, Groovy, but kind o...

# getting-started

[Rob Elliot]

Probably being thick... I need to construct a boxed inline class from Java (well, Groovy, but kind of the same thing...) in order to put it in a list. I can't currently work out how?

[ephemient]

it's not quite the same thing, since Groovy can more easily access things that Java can't

[ephemient]

$ groovysh -cp kotlin-stdlib-1.8.10.jar
groovy:000> kotlin.UInt."box-impl"(-1)
===> 4294967295

[ephemient]

but perhaps reconsider if you have to do this. why do you have a list of boxed inline classes and why does it need to be used outside of Kotlin?

[Rob Elliot]

I've got a Kotlin function that returns List<ValueType> and I need to test it in Spock, hence Groovy calling Kotlin.

I'm not sure if I can avoid them being boxed while keeping the Kotlin type... all I'm doing is listOf("1", "2").map { ValueType(it) }.toSet() and that seems to box them.

[Rob Elliot]

But thanks, that's a good point on groovy being able to call members with weird names, that works!

[ephemient]

you could build your own specialized ValueTypeSet (as UIntArray does for UInt) that is represented by a Set<String> or whatever the val you're wrapping is

[ephemient]

but that'll be pretty awkward, at least until https://youtrack.jetbrains.com/issue/KT-44654

[Rob Elliot]

Honestly I could probably just use a data class - it's not like the memory is actually an issue, I just quite like the idea of compiler enforced type aliases!