Hello! I have a question. In official kDoc for `su...

# coroutines

[Mikolaj]

Hello!
I have a question. In official kDoc for suspendCancellableCoroutine there is an example of usage with callback (example in 🧵).
Will incokeOnCancellation be called only when coroutine is cancelled? Or does calling resumeWithException also invokes the incokeOnCancellation block?

[Mikolaj]

suspend fun awaitCallback(): T = suspendCancellableCoroutine { continuation ->
    val callback = object : Callback {
        override fun onCompleted(value: T) {
            continuation.resume(value)
        }

        override fun onApiError(cause: Throwable) {
            continuation.resumeWithException(cause)
        }

    }

    api.register(callback)

    continuation.invokeOnCancellation { api.unregister(callback) }
}

[baxter]

From invokeOnCancellation method:
> Registers a handler to be synchronously invoked on cancellation (regular or exceptional) of this continuation. When the continuation is already cancelled, the handler is immediately invoked with the cancellation exception. Otherwise, the handler will be invoked as soon as this continuation is cancelled.

[baxter]

The CancellableContinuation object used by suspendCancellableCoroutine also has a resume() method that takes both the value you want to resume with, as well as a lambda to run if the value was cancelled when the value was not used.

https://kotlinlang.org/api/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/-cancellable-continuation/#499398008%2FFu[…]ns%2F1975948010