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Add a Coalescent instance for Join over These.

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This commit is contained in:
Rob Rix 2016-03-14 20:19:44 -04:00
parent f8678b6f8e
commit 11fc889883
1 changed files with 7 additions and 0 deletions
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src/Data/Coalescent.hs
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@ -1,6 +1,10 @@
{-# LANGUAGE FlexibleInstances #-}
module Data.Coalescent where
import Control.Applicative
import Data.Align
import Data.Bifunctor.Join
import Data.Bifunctor.These
import Data.Functor.Identity
-- | The class of types which can optionally be coalesced together.
@ -13,3 +17,6 @@ instance Coalescent a => Coalescent (Identity a) where
instance Coalescent a => Coalescent (Maybe a) where
a `coalesce` b = sequenceA (coalesce <$> a <*> b)
instance Coalescent a => Coalescent (Join These a) where
a `coalesce` b = sequenceA (coalesce <$> a <*> b)