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Add MonadMoment instances for all transformers #248

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Mar 11, 2022
Merged

Add MonadMoment instances for all transformers #248

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8b937da
Add `MonadMoment` instances for all `transformers`
ocharles Mar 11, 2022
4ce9d47
CPP for CPS
ocharles Mar 11, 2022
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35 changes: 35 additions & 0 deletions reactive-banana/src/Reactive/Banana/Types.hs
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
{-# language CPP #-}

{-----------------------------------------------------------------------------
reactive-banana
------------------------------------------------------------------------------}
Expand All @@ -12,6 +14,23 @@ import Control.Applicative
import Control.Monad.IO.Class
import Control.Monad.Fix
import Data.String (IsString(..))
import Control.Monad.Trans.Accum (AccumT)
import Control.Monad.Trans.Class (lift)
import Control.Monad.Trans.Except (ExceptT)
import Control.Monad.Trans.Identity (IdentityT)
import Control.Monad.Trans.Maybe (MaybeT)
import qualified Control.Monad.Trans.RWS.Lazy as Lazy (RWST)
import qualified Control.Monad.Trans.RWS.Strict as Strict (RWST)
import Control.Monad.Trans.Reader (ReaderT)
import qualified Control.Monad.Trans.State.Lazy as Lazy (StateT)
import qualified Control.Monad.Trans.State.Strict as Strict (StateT)
import qualified Control.Monad.Trans.Writer.Lazy as Lazy (WriterT)
import qualified Control.Monad.Trans.Writer.Strict as Strict (WriterT)

#if MIN_VERSION_transformers(0,5,6)
import qualified Control.Monad.Trans.RWS.CPS as CPS (RWST)
import qualified Control.Monad.Trans.Writer.CPS as CPS (WriterT)
#endif

import qualified Reactive.Banana.Prim.High.Combinators as Prim

Expand Down Expand Up @@ -185,6 +204,22 @@ class MonadFix m => MonadMoment m where

instance MonadMoment Moment where liftMoment = id
instance MonadMoment MomentIO where liftMoment = MIO . unM
instance (MonadMoment m, Monoid w) => MonadMoment (AccumT w m) where liftMoment = lift . liftMoment
instance MonadMoment m => MonadMoment (ExceptT e m) where liftMoment = lift . liftMoment
instance MonadMoment m => MonadMoment (IdentityT m) where liftMoment = lift . liftMoment
instance MonadMoment m => MonadMoment (MaybeT m) where liftMoment = lift . liftMoment
instance (MonadMoment m, Monoid w) => MonadMoment (Lazy.RWST r w s m) where liftMoment = lift . liftMoment
instance (MonadMoment m, Monoid w) => MonadMoment (Strict.RWST r w s m) where liftMoment = lift . liftMoment
instance MonadMoment m => MonadMoment (ReaderT r m) where liftMoment = lift . liftMoment
instance MonadMoment m => MonadMoment (Lazy.StateT s m) where liftMoment = lift . liftMoment
instance MonadMoment m => MonadMoment (Strict.StateT s m) where liftMoment = lift . liftMoment
instance (MonadMoment m, Monoid w) => MonadMoment (Lazy.WriterT w m) where liftMoment = lift . liftMoment
instance (MonadMoment m, Monoid w) => MonadMoment (Strict.WriterT w m) where liftMoment = lift . liftMoment

#if MIN_VERSION_transformers(0,5,6)
instance MonadMoment m => MonadMoment (CPS.RWST r w s m) where liftMoment = lift . liftMoment
instance MonadMoment m => MonadMoment (CPS.WriterT w m) where liftMoment = lift . liftMoment
#endif

-- boilerplate class instances
instance Functor Moment where fmap f = M . fmap f . unM
Expand Down