Is anyone else experiencing odd behavior across platforms? on linux, kotlin/native assumes an `unsig...

# kotlin-native

[martmists]

Is anyone else experiencing odd behavior across platforms? on linux, kotlin/native assumes an unsigned long is a ULong, but on windows it's parsed as UInt

[russhwolf]

I don't know about unsigned long on those platforms in particular but it is common for k/n platforms with different integer widths to map numerical types differently

[martmists]

So what should I do to make my code work cross-platform in a way that doesn't require me to maintain multiple branches?

[russhwolf]

One way is to add `expect`/`actual` declarations around your interactions with variable-width types. There's also a convert() function which can help but if you're not careful you can lose information because it's just a shorthand for calling toInt() or toLong() as needed.

[martmists]

I can't seem to find the convert function, do you know why that would happen?

Also, where can I read about expect and actual

[russhwolf]

Sometimes you need to import convert manually. import kotlinx.cinterop.convert https://kotlinlang.org/api/latest/jvm/stdlib/kotlinx.cinterop/convert.html

[russhwolf]

For expect/actual see https://kotlinlang.org/docs/mpp-connect-to-apis.html

[martmists]

how would I then include separate files for different OSes? I couldn't find any easy methods for includes/excludes in gradle on the configurations

[russhwolf]

You probably want to read up more on the multiplatform project structure. See here for example https://kotlinlang.org/docs/mpp-discover-project.html#source-sets

[martmists]

I already checked there but it didn't specify how to include/exclude files other than from cinterops

I already tried to do it through gradle with

kotlin
sourceSets {
    val nativeMain by getting {
        kotlin.apply {
            exclude("**/platform/*.kt")
            when {
                hostOs == "Mac OS X" -> include("**/platform/macos.kt")
                hostOs == "Linux" -> include("**/platform/linux.kt")
                isMingwX64 -> include("**/platform/windows.kt")
            }
        }
    }
}

but it didn't seem to work

gradle runReleaseExecutableNative also doesn't do anything, yet doesn't compile with any errors even though there should be according to the IDE