Is there some problem with manipulating objective-c classes from Kotlin? I'm sure the answer should be "no", but I'm getting nowhere with creating and manipulating CGMutablePaths. The code doesn't throw errors, I can watch it run in the (XCode) debugger, but the paths never seem to acquire any elements. The variable window shows my CGmutablePath variable as "(void **)". which is worrying, but below that shows it as "(__NSCFType *)", and both with "Summary Unavailable". However, both show memory locations as if something has been allocated... Any ideas?

Can you post some sample code? Those structs have creation functions in ObjC which if memory serves, map a little differently to Kotlin than is obvious.

I'll try. I hope I don't leave out anything important, 'cos there's a lot of fiddling around to make this cross platform. I have a Kotlin class to encapsulate this, MmPath. It can't inherit from CGPath because that's final in the iOS world. It's much easier on the Android side. The iOs versoin has a property thePath

private var thePath = CGPathCreateMutable()

"Standard" operations are (still) pretty simple to code, for example

fun moveTo(x: Float, y: Float) {
        CGPathMoveToPoint(thePath, scaling, x.toDouble(), y.toDouble())
    }

So I can (ie "hope to") create and use a path as (eg)

var aPath = MmPath()
aPath.moveTo(50F, 50F)