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Language	Haskell2010

Control.Carrier.Accum.Church

Contents

Accum carrier
Accum effect

Description

A high-performance, strict, church-encoded carrier for Accum.

This carrier issues left-associated mappends, meaning that Monoids such as [] with poor performance for left-associated mappends are ill-suited for use with this carrier. Alternatives such as Endo, Seq, or DList may be preferred.

Since: 1.1.2.0

Synopsis

runAccum :: (w -> a -> m b) -> w -> AccumC w m a -> m b
execAccum :: Applicative m => w -> AccumC w m a -> m w
evalAccum :: Applicative m => w -> AccumC w m a -> m a
newtype AccumC w m a = AccumC (forall r. (w -> a -> m r) -> w -> m r)
module Control.Effect.Accum

Accum carrier

runAccum :: (w -> a -> m b) -> w -> AccumC w m a -> m b Source #

Run an Accum effect with a Monoidal log, applying a continuation to the final log and result.

runAccum k w0 (pure a) = k w0 a

runAccum k w0 (add w) = k (w0 <> w) ()

runAccum k w0 (add w >> look) = k (w0 <> w) (w0 <> w)

Since: 1.1.2.0

execAccum :: Applicative m => w -> AccumC w m a -> m w Source #

Run an Accum effect (typically with a Monoidal log), producing the final log and discarding the result value.

execAccum = runAccum (const . pure)

Since: 1.1.2.0

evalAccum :: Applicative m => w -> AccumC w m a -> m a Source #

Run an Accum effect (typically with a Monoidal log), producing the result value and discarding the final log.

evalAccum = runAccum (const . pure)

Since: 1.1.2.0

newtype AccumC w m a Source #

Since: 1.1.2.0

Constructors

AccumC (forall r. (w -> a -> m r) -> w -> m r)

Instances

Instances details

Monoid w => MonadTrans (AccumC w) Source #
Instance details Defined in Control.Carrier.Accum.Church Methods lift :: Monad m => m a -> AccumC w m a #
(MonadFail m, Monoid w) => MonadFail (AccumC w m) Source #
Instance details Defined in Control.Carrier.Accum.Church Methods fail :: String -> AccumC w m a #
(MonadFix m, Monoid w) => MonadFix (AccumC w m) Source #
Instance details Defined in Control.Carrier.Accum.Church Methods mfix :: (a -> AccumC w m a) -> AccumC w m a #
(MonadIO m, Monoid w) => MonadIO (AccumC w m) Source #
Instance details Defined in Control.Carrier.Accum.Church Methods liftIO :: IO a -> AccumC w m a #
(Alternative m, Monad m, Monoid w) => Alternative (AccumC w m) Source #
Instance details Defined in Control.Carrier.Accum.Church Methods empty :: AccumC w m a # (<\|>) :: AccumC w m a -> AccumC w m a -> AccumC w m a # some :: AccumC w m a -> AccumC w m [a] # many :: AccumC w m a -> AccumC w m [a] #
Monoid w => Applicative (AccumC w m) Source #
Instance details Defined in Control.Carrier.Accum.Church Methods pure :: a -> AccumC w m a # (<>) :: AccumC w m (a -> b) -> AccumC w m a -> AccumC w m b # liftA2 :: (a -> b -> c) -> AccumC w m a -> AccumC w m b -> AccumC w m c # (>) :: AccumC w m a -> AccumC w m b -> AccumC w m b # (<*) :: AccumC w m a -> AccumC w m b -> AccumC w m a #
Functor (AccumC w m) Source #
Instance details Defined in Control.Carrier.Accum.Church Methods fmap :: (a -> b) -> AccumC w m a -> AccumC w m b # (<$) :: a -> AccumC w m b -> AccumC w m a #
(Monad m, Monoid w) => Monad (AccumC w m) Source #
Instance details Defined in Control.Carrier.Accum.Church Methods (>>=) :: AccumC w m a -> (a -> AccumC w m b) -> AccumC w m b # (>>) :: AccumC w m a -> AccumC w m b -> AccumC w m b # return :: a -> AccumC w m a #
(MonadPlus m, Monoid w) => MonadPlus (AccumC w m) Source #
Instance details Defined in Control.Carrier.Accum.Church Methods mzero :: AccumC w m a # mplus :: AccumC w m a -> AccumC w m a -> AccumC w m a #
(Algebra sig m, Monoid w) => Algebra (Accum w :+: sig) (AccumC w m) Source #
Instance details Defined in Control.Carrier.Accum.Church Methods alg :: forall ctx (n :: Type -> Type) a. Functor ctx => Handler ctx n (AccumC w m) -> (Accum w :+: sig) n a -> ctx () -> AccumC w m (ctx a) Source #

Accum effect

module Control.Effect.Accum