BDCS.Utils.Error

Functions to help with errors

Documentation

errorToEither :: MonadError e m => m a -> m (Either e a)

Convert an error action into an Either This is essentially runExceptT generalized to MonadError

errorToMaybe :: MonadError e m => m a -> m (Maybe a)

Convert an error into into nothing

mapError :: MonadError e' m => (e -> e') -> ExceptT e m a -> m a

Run an ExceptT action. On error, run a supplied function to convert the error into some type that can be thrown with throwError in MonadError. On success, simply return the value of the action.