24 lines
692 B
Text
24 lines
692 B
Text
# answer.ludic — one listener per kind: each answers only for its own and returns early for
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# every other. A `return` ends that listener, never the dispatch, so the listener for kind 2
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# still hears the event after the one for kind 1 has returned.
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#
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# Running it prints: 10 20 0
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program Answer {
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event cancellable Ask { kind: int }
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var answer: int = 0
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@On(Ask) handler One { if kind != 1 { return }; answer = 10; cancel }
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@On(Ask) handler Two { if kind != 2 { return }; answer = 20; cancel }
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function ask(k: int) -> int {
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answer = 0
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if emit Ask(kind: k) != 0 { return answer }
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return 0
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}
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entry {
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print(ask(1))
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print(ask(2))
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print(ask(3))
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}
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}
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