CoroutineScope class delegation

CoroutineScopeClassDelegation.kt

abstract class BaseViewModel : 
  ViewModel(), 
  CoroutineScope by SupervisorCoroutineScope(Dispatchers.Default) {

  override fun onCleared() {
    cancel()
    super.onCleared()
  }
}

abstract class BaseActivity : 
  Activity(), 
  CoroutineScope by MainScope() {

  override fun onDestroy() {
    cancel()
    super.onDestroy()
  }
}

// this is dangerous since the class doesn't have a lifecycle!
class MyRepositoryImpl : 
    MyRepository, 
    CoroutineScope by SupervisorCoroutineScope(Dispatchers.IO)