Signaling an exception

Exceptions are signaled by sending one of the following methods to the appropriate instance of ExceptionalEvent:

signal

Invokes the exception with no arguments.

signalWith:

Invokes the exception with a single argument.

signalWith:with:

Invokes the exception with two arguments.

signalWithArguments:

Invokes the exception with anArray of arguments

The following examples signal a couple of types of exception:

Example: signaling end of file

| anEndOfFileException |

(anEndOfFileException := ExAll newChild)

description: 'end of file'.

anEndOfFileException signal.

Example: signaling message not understood

| aMessageNotUnderstoodException |

(aMessageNotUnderstoodException := ExAll newChild)

description: 'message not understood'.

aMessageNotUnderstoodException

signalWith: (DirectedMessage selector: #halt arguments: #() receiver: self)

When an exception is signaled, an instance of class Signal is created that contains information describing the circumstances where the exception occurred.