Probably being thick I need to construct a boxed inline clas kotlinlang #getting-started

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

03/01/2023, 6:19 PM

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

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

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

03/01/2023, 7:07 PM

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.

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

ephemient

03/01/2023, 7:19 PM

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

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

Rob Elliot

03/01/2023, 7:22 PM

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!

3 Views

#getting-started Join Slack