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Within LTS Haskell 24.65 (ghc-9.10.3)

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1. minusNaturalMaybe :: Natural -> Natural -> Maybe Natural

   ghc-internal	GHC.Internal.Numeric.Natural

   Natural subtraction. Returns Nothings for non-positive results.

2. statGetType_maybe :: Ptr CStat -> IO (Maybe IODeviceType)

   ghc-internal	GHC.Internal.System.Posix.Internals

   Unlike statGetType, statGetType_maybe will not throw an exception if the CStat refers to a unknown device type.

3. readMaybe :: Read a => String -> Maybe a

   ghc-internal	GHC.Internal.Text.Read

   Parse a string using the Read instance. Succeeds if there is exactly one valid result.

   >>> readMaybe "123" :: Maybe Int
   Just 123
   

   >>> readMaybe "hello" :: Maybe Int
   Nothing
   

4. nextMaybeF :: Int -> (Int -> Bool) -> (Int -> Int) -> (Maybe Int -> f a) -> f a

   massiv	Data.Massiv.Core.Index

   No documentation available.

5. scatMaybes :: Stream r ix (Maybe a) => Array r ix (Maybe a) -> Vector DS a

   massiv	Data.Massiv.Vector

   Keep all Maybes and discard the Nothings.

   Examples

6. simapMaybe :: Stream r ix a => (ix -> a -> Maybe b) -> Array r ix a -> Vector DS b

   massiv	Data.Massiv.Vector

   Similar to smapMaybe, but map with an index aware function.

   Examples

7. simapMaybeM :: forall r ix a b f . (Stream r ix a, Applicative f) => (ix -> a -> f (Maybe b)) -> Array r ix a -> f (Vector DS b)

   massiv	Data.Massiv.Vector

   Similar to smapMaybeM, but map with an index aware function.

   Examples

8. smapMaybe :: Stream r ix a => (a -> Maybe b) -> Array r ix a -> Vector DS b

   massiv	Data.Massiv.Vector

   Apply a function to each element of the array, while discarding Nothing and keeping the Maybe result.

   Examples

9. smapMaybeM :: forall r ix a b f . (Stream r ix a, Applicative f) => (a -> f (Maybe b)) -> Array r ix a -> f (Vector DS b)

   massiv	Data.Massiv.Vector

   Similar to smapMaybe, but with the Applicative function. Similar to mapMaybe id $ mapM f arr

   Examples

10. bitSizeMaybe :: Bits a => a -> Maybe Int

    protolude	Protolude

    Return the number of bits in the type of the argument. The actual value of the argument is ignored. Returns Nothing for types that do not have a fixed bitsize, like Integer.

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