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Define a default implementation of gsequenceAlt.

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Rob Rix 2016-07-22 15:42:31 -04:00
parent ff869ec517
commit bc5f05494d
1 changed files with 3 additions and 0 deletions
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src/Data/Sequenceable/Generic.hs
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@ -1,3 +1,4 @@
{-# LANGUAGE DefaultSignatures #-}
module Data.Sequenceable.Generic where
import GHC.Generics
@ -7,6 +8,8 @@ import Prologue
class GSequenceable t where
gsequenceAlt :: Alternative f => t (f a) -> f (t a)
default gsequenceAlt :: (Generic1 t, GSequenceable (Rep1 t), Alternative f) => t (f a) -> f (t a)
gsequenceAlt = fmap to1 . gsequenceAlt . from1
-- Instances