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Deriving Via #3

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georgefst opened this issue Nov 14, 2019 · 0 comments
Open

Deriving Via #3

georgefst opened this issue Nov 14, 2019 · 0 comments

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@georgefst
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georgefst commented Nov 14, 2019 •
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It would be great if you exported a datatype along the lines of

newtype Pickle t = Pickle t deriving newtype Generic
instance (Generic t, GXmlPickler (Rep t), ConNames (Rep t)) => XmlPickler (Pickle t) where
    xpickle = gxpickle

Then users could use deriving via to derive instances, with even less boilerplate. e.g:

data User = User
  { name  :: String
  , admin :: Bool
  } deriving (Show, Generic)
    deriving XmlPickler via Pickle User

I may submit a PR for this if I can convince myself it's a safe use of UndecidableInstances.
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@georgefst