1.1.9.1 function pointer

• A real example of function pointer is set_new_handler. It accepts a function pointer and return the same function pointer, so delcaring such format is a little difficult.
  void failNew(){ 
  cerr<<"Fail␣now"<<endl 
  abort(); 
  } 
  ----------------------------------------- 
  extern void ( *set_new_handler ( void (*)() ) ) (); 
  // This function declaration is very complex. 
  set_new_handler(failNew);
• A better method is to use typedef method.
  typedef void(* FunPtr)(); 
   
  FunPtr (*set_new_handler) (FunPtr); 
   
  set_new_handler(failNew);