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Define Monoid instance for ReaderT #97

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Merged
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
f54ea28
abc order imports
safareli Jun 1, 2017
62704bd
update pulp and psa
safareli Jun 1, 2017
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4 changes: 2 additions & 2 deletions package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -6,8 +6,8 @@
"test": "pulp test"
},
"devDependencies": {
"pulp": "^10.0.4",
"purescript-psa": "^0.5.0-rc.1",
"pulp": "^11.0.0",
"purescript-psa": "^0.5.1",
"rimraf": "^2.6.1"
}
}
8 changes: 8 additions & 0 deletions src/Control/Monad/Reader/Trans.purs
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Expand Up @@ -10,6 +10,7 @@ import Prelude

import Control.Alt (class Alt, (<|>))
import Control.Alternative (class Alternative)
import Control.Apply (lift2)
import Control.Monad.Cont.Class (class MonadCont, callCC)
import Control.Monad.Eff.Class (class MonadEff, liftEff)
import Control.Monad.Error.Class (class MonadThrow, class MonadError, catchError, throwError)
Expand All @@ -23,6 +24,7 @@ import Control.MonadZero (class MonadZero)
import Control.Plus (class Plus, empty)

import Data.Distributive (class Distributive, distribute, collect)
import Data.Monoid (class Monoid, mempty)
import Data.Newtype (class Newtype)

-- | The reader monad transformer.
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