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ISODEF
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exceptio.def
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1994-12-22
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DEFINITION MODULE EXCEPTIONS;
(* Provides facilities for raising user exceptions
and for making enquiries concerning the current execution state.
*)
TYPE
ExceptionSource; (* values of this type are used within library modules to
identify the source of raised exceptions *)
ExceptionNumber = CARDINAL;
PROCEDURE AllocateSource(VAR newSource: ExceptionSource);
(* Allocates a unique value of type ExceptionSource *)
PROCEDURE RAISE (source: ExceptionSource; number: ExceptionNumber; message: ARRAY OF CHAR);
(* Associates the given values of source, number and message with the current context
and raises an exception.
*)
PROCEDURE CurrentNumber (source: ExceptionSource): ExceptionNumber;
(* If the current coroutine is in the exceptional execution state because of the raising
of an exception from source, returns the corresponding number, and otherwise
raises an exception.
*)
PROCEDURE GetMessage (VAR text: ARRAY OF CHAR);
(* If the current coroutine is in the exceptional execution state, returns the possibly
truncated string associated with the current context.
Otherwise, in normal execution state, returns the empty string.
*)
PROCEDURE IsCurrentSource (source: ExceptionSource): BOOLEAN;
(* If the current coroutine is in the exceptional execution state because of the raising
of an exception from source, returns TRUE, and otherwise returns FALSE.
*)
PROCEDURE IsExceptionalExecution (): BOOLEAN;
(* If the current coroutine is in the exceptional execution state because of the raising
of an exception, returns TRUE, and otherwise returns FALSE.
*)
END EXCEPTIONS.