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Within LTS Haskell 24.64 (ghc-9.10.3)

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  1. maybeFromByteString :: ByteString -> T T

    midi Sound.MIDI.Message

    No documentation available.

  2. maybeLens :: b -> Lens' (Maybe b) b

    proto-lens Data.ProtoLens.Message

    A helper lens for accessing optional fields. This is used as part of code generation, and should generally not be needed explicitly. Note that maybeLens does not satisfy the lens laws, which expect that set l (view l x) == x. For example, 

    set (maybeLens 'a') (view (maybeLens 'a') Nothing) == Just 'a'
    However, this is the behavior generally expected by users, and only matters if we're explicitly checking whether a field is set.

  3. maybeToEnum :: MessageEnum a => Int -> Maybe a

    proto-lens Data.ProtoLens.Message

    Convert the given Int to an enum value. Returns Nothing if no corresponding value was defined in the .proto file.

  4. 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

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

    protolude Protolude.Either

    No documentation available.

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

    protolude Protolude.Either

    No documentation available.

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

    protolude Protolude.Either

    No documentation available.

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

    protolude Protolude.Either

    No documentation available.

  9. maybeDCaseE :: MatchContext -> DExp -> [DMatch] -> DExp

    th-desugar Language.Haskell.TH.Desugar

    If matches is non-empty, make a case statement; otherwise make an error statement

  10. maybeDLetE :: [DLetDec] -> DExp -> DExp

    th-desugar Language.Haskell.TH.Desugar

    If decs is non-empty, delcare them in a let:

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