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17 lines
528 B
Agda
17 lines
528 B
Agda
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module FFI.Data.Either where
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{-# FOREIGN GHC import qualified Data.Either #-}
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data Either (A B : Set) : Set where
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Left : A → Either A B
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Right : B → Either A B
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{-# COMPILE GHC Either = data Data.Either.Either (Data.Either.Left|Data.Either.Right) #-}
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mapLeft : ∀ {A B C} → (A → B) → (Either A C) → (Either B C)
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mapLeft f (Left x) = Left (f x)
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mapLeft f (Right x) = Right x
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mapRight : ∀ {A B C} → (B → C) → (Either A B) → (Either A C)
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mapRight f (Left x) = Left x
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mapRight f (Right x) = Right (f x)
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