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1. maybeFromByteString :: ByteString -> T T

   midi	Sound.MIDI.Message

   No documentation available.

2. maybeToList :: Maybe a -> [a]

   ghc-internal	GHC.Internal.Data.Maybe

   The maybeToList function returns an empty list when given Nothing or a singleton list when given Just.

   Examples

   Basic usage:

   >>> maybeToList (Just 7)
   [7]
   

   >>> maybeToList Nothing
   []
   

   One can use maybeToList to avoid pattern matching when combined with a function that (safely) works on lists:

   >>> import GHC.Internal.Text.Read ( readMaybe )
   
   >>> sum $ maybeToList (readMaybe "3")
   3
   
   >>> sum $ maybeToList (readMaybe "")
   0
   

3. maybeNew :: (a -> IO (Ptr b)) -> Maybe a -> IO (Ptr b)

   ghc-internal	GHC.Internal.Foreign.Marshal.Utils

   Allocate storage and marshal a storable value wrapped into a Maybe

   • the nullPtr is used to represent Nothing

4. maybePeek :: (Ptr a -> IO b) -> Ptr a -> IO (Maybe b)

   ghc-internal	GHC.Internal.Foreign.Marshal.Utils

   Convert a peek combinator into a one returning Nothing if applied to a nullPtr

5. maybeWith :: (a -> (Ptr b -> IO c) -> IO c) -> Maybe a -> (Ptr b -> IO c) -> IO c

   ghc-internal	GHC.Internal.Foreign.Marshal.Utils

   Converts a withXXX combinator into one marshalling a value wrapped into a Maybe, using nullPtr to represent Nothing.

6. maybeToList :: Maybe a -> [a]

   protolude	Protolude

   The maybeToList function returns an empty list when given Nothing or a singleton list when given Just.

   Examples

   Basic usage:

   >>> maybeToList (Just 7)
   [7]
   

   >>> maybeToList Nothing
   []
   

   One can use maybeToList to avoid pattern matching when combined with a function that (safely) works on lists:

   >>> import GHC.Internal.Text.Read ( readMaybe )
   
   >>> sum $ maybeToList (readMaybe "3")
   3
   
   >>> sum $ maybeToList (readMaybe "")
   0
   

7. maybeEmpty :: Monoid b => (a -> b) -> Maybe a -> b

   protolude	Protolude.Either

   No documentation available.

8. maybeToEither :: e -> Maybe a -> Either e a

   protolude	Protolude.Either

   No documentation available.

9. maybeToLeft :: r -> Maybe l -> Either l r

   protolude	Protolude.Either

   No documentation available.

10. maybeToRight :: l -> Maybe r -> Either l r

    protolude	Protolude.Either

    No documentation available.

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