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Within LTS Haskell 24.38 (ghc-9.10.3)

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1. nullspecMaybeFields :: Nullspec a b -> Nullspec (MaybeFields a) (MaybeFields b)

   opaleye	Opaleye.MaybeFields

   No documentation available.

2. toFieldsMaybeFields :: Nullspec a b -> ToFields a b -> ToFields (Maybe a) (MaybeFields b)

   opaleye	Opaleye.MaybeFields

   No documentation available.

3. traverseMaybeFields :: (Default Unpackspec a a, Default Unpackspec b b) => SelectArr a b -> SelectArr (MaybeFields a) (MaybeFields b)

   opaleye	Opaleye.MaybeFields

   traverseMaybeFields is analogous to Haskell's traverse :: (a -> [b]) -> Maybe a -> [Maybe b]. In particular, traverse has the following definition that generalises to traverseMaybeFields:

   • traverse _ Nothing = pure Nothing

   • traverse f (Just x) = fmap Just (f x)

4. traverseMaybeFieldsExplicit :: Unpackspec a a -> Unpackspec b b -> SelectArr a b -> SelectArr (MaybeFields a) (MaybeFields b)

   opaleye	Opaleye.MaybeFields

   No documentation available.

5. unpackspecMaybeFields :: Unpackspec a b -> Unpackspec (MaybeFields a) (MaybeFields b)

   opaleye	Opaleye.MaybeFields

   No documentation available.

6. valuesspecMaybeFields :: Valuesspec a b -> Valuesspec (MaybeFields a) (MaybeFields b)

   opaleye	Opaleye.MaybeFields

   No documentation available.

7. checkMapMaybe :: HasCallStack => (a -> Maybe b) -> Parser a -> Parser b

   opt-env-conf	OptEnvConf

   Like checkMapEither but without a helpful error message. Prefer checkMapEither.

8. checkMapMaybe :: HasCallStack => (a -> Maybe b) -> Parser a -> Parser b

   opt-env-conf	OptEnvConf

   Like checkMapEither but without a helpful error message. Prefer checkMapEither.

9. checkMapMaybeForgivable :: HasCallStack => (a -> Maybe b) -> Parser a -> Parser b

   opt-env-conf	OptEnvConf

   Like checkMapMaybe, but allow trying the other side of any alternative if the result is Nothing.

10. checkMaybe :: HasCallStack => (a -> Maybe a) -> Parser a -> Parser a

    opt-env-conf	OptEnvConf

    Like checkMapMaybe but without changing the type

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