Control.Monad.Event
- data EventT t m a
- type EventM = EventIO Double
- module Control.Monad.Event.BasicEvents
- module Control.Monad.Event.Classes
- data EventDescriptor m t = forall e . ScheduleEvent m t e => EventDescriptor {}
- newtype EventID = EventID Int
Documentation
A monad transformer which adds an event queue and related operations to an underlying monad. The "t" parameter specifies the type of the simulation time.
Several hooks are provided to allow special handling of various events, such as the progression of time, the scheduling or canceling or dispatch of an event, etc.
Instances
| MonadReader r m => MonadReader r (EventT t m) | |
| MonadState s m => MonadState s (EventT t m) | |
| MonadError e m => MonadError e (EventT t m) | |
| MonadWriter w m => MonadWriter w (EventT t m) | |
| MonadTrans (EventT t) | |
| Monad m => Monad (EventT t m) | |
| Monad m => Functor (EventT t m) | |
| MonadFix m => MonadFix (EventT t m) | |
| MonadPlus m => MonadPlus (EventT t m) | |
| MonadCont m => MonadCont (EventT t m) | |
| MonadIO m => MonadIO (EventT t m) | |
| Monad m => MonadSimControl (EventT t m) | |
| Monad m => MonadTime (EventT t m) t | |
| (Monad m, Ord t) => MonadEventQueueInfo (EventT t m) t | |
| Monad m => RetryEvent (EventT t m) t | |
| Monad m => GetCurrentEvent (EventT t m) t | |
| (Monad m, Ord t) => CancelEvent (EventT t m) t | |
| (Monad m, Ord t, MonadEvent (EventT t m) e) => ScheduleEvent (EventT t m) t e | |
| (Monad m, Show t) => MonadEvent (EventT t m) (EventDescriptor (EventT t m) t) | |
| Monad m => MonadEvent (EventT t m) (EventT t m a) |
module Control.Monad.Event.Classes
data EventDescriptor m t Source
An existential wrapper containing an event which can be executed in the
monad m.
I would like to existentially quantify the time parameter too, since it's
uniquely determined according to the functional dependencies of MonadTime,
but GHC doesn't unify it with its actual type in pattern matches - I was
not able to use it as a PrintfArg in:
instance MonadEvent (EventT Double IO) (EventDescriptor (EventT Double IO))
Constructors
| forall e . ScheduleEvent m t e => EventDescriptor | |
Instances
| Show t => MonadEvent (EventIO t) (EventDescriptor (EventIO t) t) | |
| (Monad m, Show t) => MonadEvent (EventT t m) (EventDescriptor (EventT t m) t) |