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17 lines
304 B
Idris
17 lines
304 B
Idris
interface IsEven a where
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isEven : a -> Bool
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interface IsOdd b where
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isOdd : b -> Bool
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implementation IsOdd Nat
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implementation IsEven Nat where
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isEven 0 = True
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isEven (S k) = not $ isOdd k
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implementation Show Nat => IsOdd Nat where
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isOdd 0 = True
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isOdd (S k) = not $ isEven k
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