auto_ptr example

 void  do_enrolment(string  name,
                                  string  course)  {
         Person  *pp  =  new  Person(name);
         auto_ptr<Person>  p(pp);

         p->enrol(course);
         //  do  some  stuff
         if  (error_found)  throw  Error();
         //  do  some  more  stuff
         //  not  needed:  delete  pp;
 }