Explain how to implement exceptions in a way that incurs no cost in the common case (when exceptions don’t arise). How do the exception handlers of a functional language like ML differ from those of...

Explain how to implement exceptions in a way that incurs no cost in the common case (when exceptions don’t arise). How do the exception handlers of a functional language like ML differ from those of an imperative language like C++? Describe the operations that must be performed by the implicit handler for a subroutine.