Hi, why does `platform.darwin.DISPATCH_DATA_DESTRU...

# kotlin-native

[Thomas]

Hi, why does platform.darwin.DISPATCH_DATA_DESTRUCTOR_DEFAULT not appear as a dispatch_block_t? Just like DISPATCH_DATA_DESTRUCTOR_FREE, which does appear to be correct. Instead of dispatch_block_t it appears as kotlinx.cinterop.COpaquePointer?. I have no idea how I can use that as a dispatch block.

[Thomas]

message has been deleted

[olonho]

it has value of NULL, thus isn’t valid function pointer

[Thomas]

@olonho so that means I can not use it? Should I just use null instead? I want to use it as the last parameter in this function: https://developer.apple.com/documentation/dispatch/1452970-dispatch_data_create?language=objc

[Thomas]

I’m currently using this:

private fun ByteArray.toDispatchData(): dispatch_data_t = usePinned { pinned ->
    dispatch_data_create(
        buffer = pinned.addressOf(0),
        size = size.convert(),
        queue = dispatch_get_main_queue(),
        destructor =  TODO()
    )
}

So can I just use null for the destructor? Or would that cause memory leaks?

[Thomas]

I think I need to use DISPATCH_DATA_DESTRUCTOR_DEFAULT because the docs say:

If you specify the default destructor using the DISPATCH_DATA_DESTRUCTOR_DEFAULT constant, this function creates a copy of the data in buffer and manages that data internally.

[olonho]

Null shall be fine, if it compiles.

[Thomas]

Ok thanks. Appreciate the help!