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1. catchJust :: Exception e => (e -> Maybe b) -> IO a -> (b -> IO a) -> IO a

   ghc	GHC.Utils.Exception

   No documentation available.

2. handleJust :: Exception e => (e -> Maybe b) -> (b -> IO a) -> IO a -> IO a

   ghc	GHC.Utils.Exception

   No documentation available.

3. tryJust :: Exception e => (e -> Maybe b) -> IO a -> IO (Either b a)

   ghc	GHC.Utils.Exception

   No documentation available.

4. onJust :: b -> Maybe a -> (a -> b) -> b

   ghc	GHC.Utils.Misc

   onJust x m f applies f to the value inside the Just or returns the default.

5. catchJust :: (MonadBaseControl IO m, Exception e) => (e -> Maybe b) -> m a -> (b -> m a) -> m a

   lifted-base	Control.Exception.Lifted

   Generalized version of catchJust. Note, when the given computation throws an exception any monadic side effects in m will be discarded.

6. handleJust :: (MonadBaseControl IO m, Exception e) => (e -> Maybe b) -> (b -> m a) -> m a -> m a

   lifted-base	Control.Exception.Lifted

   Generalized version of handleJust. Note, when the given computation throws an exception any monadic side effects in m will be discarded.

7. tryJust :: (MonadBaseControl IO m, Exception e) => (e -> Maybe b) -> m a -> m (Either b a)

   lifted-base	Control.Exception.Lifted

   Generalized version of tryJust. Note, when the given computation throws an exception any monadic side effects in m will be discarded.

8. catchGErrorJust :: GErrorClass err => err -> IO a -> (GErrorMessage -> IO a) -> IO a

   haskell-gi-base	Data.GI.Base.GError

   This will catch just a specific GError exception. If you need to catch a range of related errors, catchGErrorJustDomain is probably more appropriate. Example:

   do image <- catchGErrorJust PixbufErrorCorruptImage
   loadImage
   (\errorMessage -> do log errorMessage
   return mssingImagePlaceholder)
   

9. catchGErrorJustDomain :: GErrorClass err => IO a -> (err -> GErrorMessage -> IO a) -> IO a

   haskell-gi-base	Data.GI.Base.GError

   Catch all GErrors from a particular error domain. The handler function should just deal with one error enumeration type. If you need to catch errors from more than one error domain, use this function twice with an appropriate handler functions for each.

   catchGErrorJustDomain
   loadImage
   (\err message -> case err of
   PixbufErrorCorruptImage -> ...
   PixbufErrorInsufficientMemory -> ...
   PixbufErrorUnknownType -> ...
   _ -> ...)
   

10. handleGErrorJust :: GErrorClass err => err -> (GErrorMessage -> IO a) -> IO a -> IO a

    haskell-gi-base	Data.GI.Base.GError

    A verson of handleGErrorJust with the arguments swapped around.

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