Polysemy.Trace

Effect

data Trace m a where

An effect for logging strings.

Constructors

Trace :: String -> Trace m ()

Instances

type DefiningModule (Trace :: k -> Type -> Type)

Defined in Polysemy.Trace

type DefiningModule (Trace :: k -> Type -> Type) = "Polysemy.Trace"

Actions

trace :: forall r. Member Trace r => String -> Sem r ()

Interpretations

runTraceIO :: Member (Lift IO) r => Sem (Trace ': r) a -> Sem r a

Run a Trace effect by printing the messages to stdout.

runTraceAsList :: Sem (Trace ': r) a -> Sem r ([String], a)

Get the result of a Trace effect as a list of Strings.

Since: 0.5.0.0

runIgnoringTrace :: Member (Lift IO) r => Sem (Trace ': r) a -> Sem r a

Run a Trace effect by ignoring all of its messages.

runTraceAsOutput :: Member (Output String) r => Sem (Trace ': r) a -> Sem r a

Transform a Trace effect into a Output String effect.

Interpretations for Other Effects

runOutputAsTrace :: (Show w, Member Trace r) => Sem (Output w ': r) a -> Sem r a

Transform a Trace effect into a Output String effect.

Since: 0.1.2.0