| Portability | portable |
|---|---|
| Stability | stable |
| Maintainer | dimitri.sabadie@gmail.com |
| Safe Haskell | None |
Control.Monad.Trans.Journal
Description
Monad transformer version of MonadJournal. JournalT provides
journaling over a monad.
This modules defines a few useful instances. Check the list below for further information.
- data JournalT w m a
- runJournalT :: (Monoid w, Monad m) => JournalT w m a -> m (a, w)
- evalJournalT :: (Monoid w, Monad m) => JournalT w m a -> m a
- execJournalT :: (Monoid w, Monad m) => JournalT w m a -> m w
- module Control.Monad.Journal.Class
JournalT monad transformer
Transformer version of MonadJournal.
Instances
| MonadBase b m => MonadBase b (JournalT w m) | |
| (Monoid w, MonadBaseControl b m) => MonadBaseControl b (JournalT w m) | |
| MonadError e m => MonadError e (JournalT w m) | |
| MonadReader r m => MonadReader r (JournalT w m) | |
| MonadState s m => MonadState s (JournalT w m) | |
| MonadWriter w' m => MonadWriter w' (JournalT w m) | |
| (Monoid w, Monad m) => MonadJournal w (JournalT w m) | |
| MonadTrans (JournalT w) | |
| Monoid w => MonadTransControl (JournalT w) | |
| Monad m => Monad (JournalT w m) | |
| Functor m => Functor (JournalT w m) | |
| MonadPlus m => MonadPlus (JournalT w m) | |
| (Monad m, Functor m) => Applicative (JournalT w m) | |
| (Functor m, MonadPlus m) => Alternative (JournalT w m) | |
| MonadIO m => MonadIO (JournalT w m) |
runJournalT :: (Monoid w, Monad m) => JournalT w m a -> m (a, w)Source
Retrieve the value and the log history.
evalJournalT :: (Monoid w, Monad m) => JournalT w m a -> m aSource
Only retrieve the value.
execJournalT :: (Monoid w, Monad m) => JournalT w m a -> m wSource
Only retrieve the log history.
Re-exported
module Control.Monad.Journal.Class