In CII CHAP 04, the macro definition for Return is:
#define return switch (Exception_stack = exception_stack-> prev, 0) Default: Return
Put in the following code:
Try
/ * Do Something * /
IF (failed)
Return 1;
ExceTpt (allocation_failed)
/ * Handle Allocation Fail * /
END_TRY
After the start is: (I don't consider the macro definition of TRY)
Try
/ * ... * /
IF (failed)
Switch (exception_stack = exception_stack-> prev, 0)
DEFAULT:
Return 1;
Except (allocation_failed)
...
END_TRY
It can be seen that this macro's only purpose is to execute an Exception_Stack = Exception_stack-> prev statement before returnit 1.
After careful consideration, you can find that other structures in the C language cannot meet this condition. If you use #define returnix (exception_stack = exception_stack-> prev, 1) Return
In IF (...) returnit 1; ELSE ... statement, the ELSE is erroneous.
The only function I think is: #define return (Exception_stack = exception_stack-> prev, 0) (Void) 0): Return
