|
| Foreign.Marshal.Error | | Portability | portable | | Stability | provisional | | Maintainer | ffi@haskell.org |
|
|
|
| Description |
| Routines for testing return values and raising a userError exception
in case of values indicating an error state.
|
|
| Synopsis |
|
|
|
| Documentation |
|
| throwIf |
| :: (a -> Bool) | error condition on the result of the IO action
| | -> (a -> String) | computes an error message from erroneous results
of the IO action
| | -> IO a | the IO action to be executed
| | -> IO a | | | Execute an IO action, throwing a userError if the predicate yields
True when applied to the result returned by the IO action.
If no exception is raised, return the result of the computation.
|
|
|
| throwIf_ :: (a -> Bool) -> (a -> String) -> IO a -> IO () |
| Like throwIf, but discarding the result
|
|
| throwIfNeg :: (Ord a, Num a) => (a -> String) -> IO a -> IO a |
| Guards against negative result values
|
|
| throwIfNeg_ :: (Ord a, Num a) => (a -> String) -> IO a -> IO () |
| Like throwIfNeg, but discarding the result
|
|
| throwIfNull :: String -> IO (Ptr a) -> IO (Ptr a) |
| Guards against null pointers
|
|
| void :: IO a -> IO () |
| Discard the return value of an IO action
|
|
| Produced by Haddock version 0.8 |