Marvin.Util.Mutable

Documentation

type Mutable v = IORef v

A mutable reference to a value of type v

newMutable :: MonadIO m => a -> m (Mutable a)

Create a new mutable reference of type v from an initial value.

readMutable :: MonadIO m => Mutable a -> m a

Retrieve the value behind by a mutable reference.

writeMutable :: MonadIO m => Mutable a -> a -> m ()

Set the value inside a mutable reference.

modifyMutable :: MonadIO m => Mutable a -> (a -> a) -> m ()

Change the value behind a mutable reference.