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factor out First

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Edward Kmett 2015-03-08 06:29:48 -04:00
parent 16803ee79e
commit a7d55d07cb
1 changed files with 1 additions and 1 deletions
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src/Control/Concurrent/Speculation/Foldable.hs
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@ -418,5 +418,5 @@ find :: (Foldable t, Eq a) => (Int -> Maybe a) -> (a -> Bool) -> t a -> Maybe a
find = findBy (==)
findBy :: Foldable t => (Maybe a -> Maybe a -> Bool) -> (Int -> Maybe a) -> (a -> Bool) -> t a -> Maybe a
findBy cmp g p = getFirst . foldMapBy (on cmp getFirst) (First . g) (\x -> if p x then First (Just x) else First Nothing)
findBy cmp g p = getFirst . foldMapBy (on cmp getFirst) (First . g) (\x -> First (if p x then Just x else Nothing))