11 lines
178 B
Text
11 lines
178 B
Text
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func Integer.Add(x) {
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throw @NegativesNotAllowed(x) when x < 0
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this + x
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}
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try {
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12.Add(-5)
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} catch {
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@NegativesNotAllowed(x) => print("Negative number: \(x)")
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}
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