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Define a genericMerge helper.

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Rob Rix 2016-07-22 17:50:08 -04:00
parent 1d7645cafe
commit 8f8bf5dad9
1 changed files with 3 additions and 0 deletions
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src/Data/Mergeable/Generic.hs
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@ -9,6 +9,9 @@ import Prologue
class GMergeable t where
gmerge :: Alternative f => (a -> f b) -> t a -> f (t b)
genericMerge :: (Generic1 t, GMergeable (Rep1 t), Alternative f) => (a -> f b) -> t a -> f (t b)
genericMerge f = fmap to1 . gmerge f . from1
genericSequenceAlt :: (Generic1 t, GMergeable (Rep1 t), Alternative f) => t (f a) -> f (t a)
genericSequenceAlt = fmap to1 . gmerge identity . from1