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Exceptions: Difference between revisions
added slate language
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You can only "throw" and "catch" symbols. Like exceptions, the throw can be made from a function defined elsewhere from the catch block.
=={{header|Slate}}==
===Handling Exceptions===
<lang slate>
se@(SceneElement traits) doWithRestart: block
[
block handlingCases: {Abort -> [| :_ | ^ Nil]}
].
</lang>
===Define Exceptions===
<lang slate>
conditions define: #Abort &parents: {Restart}.
"An Abort is a Restart which exits the computation, unwinding the stack."
_@lobby abort
[
Abort signal
].
_@(Abort traits) describeOn: console
[
console ; 'Abort evaluation of expression\n'
].
"This will call:"
c@(Condition traits) signal
"Signalling a Condition."
[
c tryHandlers
].
</lang>
===Throwing Exceptions===
<lang slate>
(fileName endsWith: '.image') ifTrue: [error: 'Image filename specified where Slate source expected. Make sure you run slate with the -i flag to specify an image.'].
</lang>
=={{header|Standard ML}}==
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