Control.Monad.Journal.Class

Contents

Description

Synopsis

MonadJournal

class (Monoid w, Monad m) => MonadJournal w m | m -> w where

Methods

journal :: w -> m ()

Log something.

Extract the logs history.

clear :: m ()

Clear the logs history.

Instances

(Monad m, Monoid w, MonadJournal w m) => MonadJournal w (MaybeT m)
(Monad m, Monoid w, MonadJournal w m) => MonadJournal w (ListT m)
(Monad m, Monoid w, MonadJournal w m) => MonadJournal w (IdentityT m)
(Monad m, Monoid w, MonadJournal w m) => MonadJournal w (EitherT e m)
(Monad m, Monoid w, Monoid q, MonadJournal w m) => MonadJournal w (WriterT q m)
(Monad m, Monoid w, MonadJournal w m) => MonadJournal w (StateT s m)
(Monad m, Monoid w, MonadJournal w m) => MonadJournal w (ReaderT r m)
(Monoid w, Monad m) => MonadJournal w (JournalT w m)
(Monad m, Monoid w, MonadJournal w m) => MonadJournal w (RWST r w s m)

sink :: (MonadJournal w m, MonadIO m) => (w -> IO ()) -> m ()

Sink all logs history through MonadIO then clean it.

absorb :: MonadJournal w m => (a, w) -> m a

Absorb a logs history and pass around the value.