Safe Haskell	None
Language	Haskell2010

Control.Carrier.Trace.Returning

Contents

Trace carrier
Trace effect

Description

A carrier for the Trace effect that aggregates and returns all traced values.

Since: 1.0.0.0

Synopsis

runTrace :: Functor m => TraceC m a -> m ([String], a)
newtype TraceC m a = TraceC (WriterC (Endo [String]) m a)
module Control.Effect.Trace

Trace carrier

runTrace :: Functor m => TraceC m a -> m ([String], a) Source #

Run a Trace effect, returning all traces as a list.

runTrace (pure a) = pure ([], a)

runTrace (trace s) = pure ([s], ())

Since: 1.0.0.0

newtype TraceC m a Source #

Since: 1.0.0.0

Constructors

TraceC (WriterC (Endo [String]) m a)

Instances

Instances details

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

Trace effect

module Control.Effect.Trace