OpenCV.Exception

Exception type

data CvException

Constructors

BindingException !CvCppException

CoerceMatError ![CoerceMatError]

Instances

Show CvException

Methods

showsPrec :: Int -> CvException -> ShowS

show :: CvException -> String

showList :: [CvException] -> ShowS

Exception CvException

Methods

toException :: CvException -> SomeException

fromException :: SomeException -> Maybe CvException

displayException :: CvException -> String

data CoerceMatError

Constructors

ShapeError !(ExpectationError Int)

SizeError !Int !(ExpectationError Int)

ChannelError !(ExpectationError Int)

DepthError !(ExpectationError Depth)

Instances

Show CoerceMatError

Methods

showsPrec :: Int -> CoerceMatError -> ShowS

show :: CoerceMatError -> String

showList :: [CoerceMatError] -> ShowS

data ExpectationError a

Constructors

ExpectationError

Fields

• expectedValue :: !a
• actualValue :: !a

Instances

Functor ExpectationError

Methods

fmap :: (a -> b) -> ExpectationError a -> ExpectationError b

(<$) :: a -> ExpectationError b -> ExpectationError a

Show a => Show (ExpectationError a)

Methods

showsPrec :: Int -> ExpectationError a -> ShowS

show :: ExpectationError a -> String

showList :: [ExpectationError a] -> ShowS

data CvCppException

Instances

Show CvCppException

Methods

showsPrec :: Int -> CvCppException -> ShowS

show :: CvCppException -> String

showList :: [CvCppException] -> ShowS

FromPtr CvCppException

Methods

fromPtr :: IO (Ptr (C CvCppException)) -> IO CvCppException

WithPtr CvCppException

Methods

withPtr :: CvCppException -> (Ptr (C CvCppException) -> IO b) -> IO b

Monadic interface

type CvExcept a = Except CvException a

type CvExceptT m a = ExceptT CvException m a

pureExcept :: Applicative m => CvExcept a -> CvExceptT m a

Promoting exceptions to errors

exceptError :: CvExcept a -> a

exceptErrorIO :: CvExceptT IO a -> IO a

exceptErrorM :: Monad m => CvExceptT m a -> m a