Exception Handling

1
Exception Handling

• Scott book, Section 8.5, pp.464-474
• PL/I exception handling
• On Conditions
• Resume or suspend execution
• Better than Fortrans error returns from
  subroutines
• Ada
• Only information was name of exception
• Adas block structure allowed tight
  placement declare begin exception end

2
Exception Handling - 2

• Common Lisp Error System / CLOS
• Exception was an object
• C
• Exceptions are objects
• Could declare exceptions that might be raised
• Ada95
• Exception handling modified for compatibility
  with C
• Java
• Exceptions full objects
• Had to declare which might be raised