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Added a useful transformEither function to Utils

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This commit is contained in:
Neil Brown 2007-08-18 15:37:29 +00:00
parent 68a3b3f4bc
commit f700392676
1 changed files with 5 additions and 0 deletions
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5
Utils.hs
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@ -34,3 +34,8 @@ doMaybe :: Monad m => Maybe (m ()) -> m ()
doMaybe (Just a) = a
doMaybe Nothing = return ()
-- | Transforms between two Either types using the appropriate convert function:
transformEither :: (a -> c) -> (b -> d) -> Either a b -> Either c d
transformEither funcLeft funcRight x = case x of
Left l -> Left (funcLeft l)
Right r -> Right (funcRight r)