Safely Catch Throwable

safelythrowable.scala

def safely[T](handler: PartialFunction[Throwable, T]): PartialFunction[Throwable, T] = {
  case ex: ControlThrowable => throw ex
  // case ex: OutOfMemoryError (Assorted other nasty exceptions you don't want to catch)
  
  //If it's an exception they handle, pass it on
  case ex: Throwable if handler.isDefinedAt(ex) => handler(ex)
  
  // If they didn't handle it, rethrow. This line isn't necessary, just for clarity
  case ex: Throwable => throw ex
}

// Usage:
/*
def doSomething: Unit = {
  try {
    somethingDangerous
  } catch safely {
    ex: Throwable => println("AHHH")
  }
}
*/