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Add a default implementation for crosswalk.

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Rob Rix 2016-03-10 13:15:48 -05:00
parent 64baf04a31
commit 35024d02cf
1 changed files with 2 additions and 0 deletions
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src/Data/Align.hs
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@ -18,6 +18,8 @@ instance Align [] where
class Functor t => Crosswalk t where
crosswalk :: Align f => (a -> f b) -> t a -> f (t b)
crosswalk f = sequenceL . fmap f
sequenceL :: Align f => t (f a) -> f (t a)
sequenceL = crosswalk id