Example of overriding ContinuationInterceptor in coroutine builders

SomeClass.kt

class SomeClass : CoroutineScope {
  
  val job = Job()
  // set the default dispatcher to Dispatchers.Main
  override val coroutineContext = job + Dispatchers.Main
  
  fun updateSomething() = launch(Dispatchers.Default) {
    // this coroutine overrides the CoroutineScope's ContinuationInterceptor
    // and uses Dispatchers.Default
    val result = getSomethingExpensive()
    
    launch(Dispatchers.Main) {
      // this coroutine inherits Default as the ContinuationInterceptor
      // and needs to explicitly switch back to Main
      // in order to update the UI      
      someView.text = result 
    }
  }
}