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28 lines
874 B
Agda
28 lines
874 B
Agda
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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swapLR : ∀ {A B} → Either A B → Either B A
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swapLR (Left x) = Right x
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swapLR (Right x) = Left x
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mapL : ∀ {A B C} → (A → B) → Either A C → Either B C
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mapL f (Left x) = Left (f x)
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mapL f (Right x) = Right x
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mapR : ∀ {A B C} → (B → C) → Either A B → Either A C
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mapR f (Left x) = Left x
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mapR f (Right x) = Right (f x)
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mapLR : ∀ {A B C D} → (A → B) → (C → D) → Either A C → Either B D
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mapLR f g (Left x) = Left (f x)
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mapLR f g (Right x) = Right (g x)
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cond : ∀ {A B C : Set} → (A → C) → (B → C) → (Either A B) → C
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cond f g (Left x) = f x
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cond f g (Right x) = g x
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