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Define Monoid instance for ReaderT #97

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merged 3 commits into from
Jun 3, 2017
Merged

Define Monoid instance for ReaderT #97

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19c2c34
define Monoid instance for ReaderT
safareli Apr 27, 2017
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abc order imports
safareli Jun 1, 2017
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update pulp and psa
safareli Jun 1, 2017
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8 changes: 8 additions & 0 deletions src/Control/Monad/Reader/Trans.purs
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Expand Up @@ -20,6 +20,8 @@ import Control.Monad.Trans.Class (class MonadTrans, lift)
import Control.Monad.Writer.Class (class MonadWriter, class MonadTell, pass, listen, tell)
import Control.MonadPlus (class MonadPlus)
import Control.MonadZero (class MonadZero)
import Data.Monoid (class Monoid, mempty)
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Please keep the sorting

import Control.Apply (lift2)
import Control.Plus (class Plus, empty)

import Data.Distributive (class Distributive, distribute, collect)
Expand Down Expand Up @@ -72,6 +74,12 @@ instance monadReaderT :: Monad m => Monad (ReaderT r m)

instance monadZeroReaderT :: MonadZero m => MonadZero (ReaderT r m)

instance semigroupReaderT :: (Apply m, Semigroup a) => Semigroup (ReaderT s m a) where
append = lift2 (<>)

instance monoidReaderT :: (Applicative m, Monoid a) => Monoid (ReaderT s m a) where
mempty = pure mempty

instance monadPlusReaderT :: MonadPlus m => MonadPlus (ReaderT r m)

instance monadTransReaderT :: MonadTrans (ReaderT r) where
Expand Down