callback to kotlin coroutine

async.kt

interface Callback<S> {
    fun success(s: S)
    fun error(e: Exception)
}

fun<T> doSomethingLong(callback: Callback<T>) {
    
}

private suspend fun  <T> someFuncAwait() :T = suspendCancellableCoroutine {
    val callback = object: Callback<T> {
        override fun success(s: T) {
            it.resume(s)
        }

        override fun error(e: Exception) {
            it.resumeWithException(e)
        }
    } // callback is garbage collected before continuation is triggered
    
    doSomethingLong(callback)
}