On Wed, Feb 08, 2006 at 12:59:48AM -0500, David Menendez wrote:
Since the monad transformers in MTL all promote MonadError, you can also
use throwError and catchError with instances of MonadIO. Currently, the
error type associated with IO is IOError, not Exception, but it should
be possible to
The ability to use functions 'catch', 'bracket', 'catchDyn', etc. in
MonadIO other than IO itself has been a fairly frequently requested
feature:
http://www.haskell.org/pipermail/glasgow-haskell-users/2003-September/005660.html
http://haskell.org/pipermail/libraries/2003-February/000774.html
[EMAIL PROTECTED] writes:
The implementation is quite trivial.
class MonadIO m = CaughtMonadIO m where
gcatch :: m a - (Exception - m a) - m a
instance CaughtMonadIO IO where
gcatch = Control.Exception.catch
instance (CaughtMonadIO m, Error e) = CaughtMonadIO (ErrorT e m)
