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Within LTS Haskell 24.38 (ghc-9.10.3)

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

    foundation Foundation.Bits

    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.

  2. lowerMaybe :: Monoid m => Maybe' m -> m

    generic-data Generic.Data.Internal.Traversable

    No documentation available.

  3. splitTyConApp_maybe :: HasDebugCallStack => Type -> Maybe (TyCon, [Type])

    ghc-typelits-presburger GHC.TypeLits.Presburger.Compat

    Attempts to tease a type apart into a type constructor and the application of a number of arguments to that constructor

  4. tyConAppTyCon_maybe :: Type -> Maybe TyCon

    ghc-typelits-presburger GHC.TypeLits.Presburger.Compat

    The same as fst . splitTyConApp We can short-cut the FunTy case

  5. windowInvalidateMaybeRecurse :: (HasCallStack, MonadIO m, IsWindow a) => a -> Region -> Maybe WindowChildFunc -> m ()

    gi-gdk3 GI.Gdk.Objects.Window

    Adds region to the update area for window. The update area is the region that needs to be redrawn, or “dirty region.” The call windowProcessUpdates sends one or more expose events to the window, which together cover the entire update area. An application would normally redraw the contents of window in response to those expose events. GDK will call windowProcessAllUpdates on your behalf whenever your program returns to the main loop and becomes idle, so normally there’s no need to do that manually, you just need to invalidate regions that you know should be redrawn. The childFunc parameter controls whether the region of each child window that intersects region will also be invalidated. Only children for which childFunc returns TRUE will have the area invalidated.

  6. warnMaybe :: Warn a -> Maybe a

    markup-parse MarkupParse

    Returns results, if any, ignoring warnings. 

    >>> warnMaybe $ (tokenize Html) "<foo><baz"
Just [OpenTag StartTag "foo" []]

  7. prop_smapMaybe :: forall r ix e a . (Eq a, Show a, Stream r ix e, Foldable (Array r ix)) => Array r ix e -> Fun e (Maybe a) -> Property

    massiv-test Test.Massiv.Array.Delayed

    No documentation available.

  8. epsilonMaybeEq :: (Show a, RealFloat a) => a -> a -> a -> Maybe String

    massiv-test Test.Massiv.Utils

    No documentation available.

  9. fromMaybe :: a -> Maybe a -> a

    massiv-test Test.Massiv.Utils

    The fromMaybe function takes a default value and a Maybe value. If the Maybe is Nothing, it returns the default value; otherwise, it returns the value contained in the Maybe.

    Examples

    Basic usage: 
    >>> fromMaybe "" (Just "Hello, World!")
"Hello, World!"

    >>> fromMaybe "" Nothing
""
    Read an integer from a string using readMaybe. If we fail to parse an integer, we want to return 0 by default: 
    >>> import GHC.Internal.Text.Read ( readMaybe )

>>> fromMaybe 0 (readMaybe "5")
5

>>> fromMaybe 0 (readMaybe "")
0

  10. suchThatMaybe :: Gen a -> (a -> Bool) -> Gen (Maybe a)

    massiv-test Test.Massiv.Utils

    Tries to generate a value that satisfies a predicate. If it fails to do so after enough attempts, returns Nothing.

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