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Add Zoom for Control.Monad.Trans.WriterT.CPS #1014

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ocharles opened this issue Dec 12, 2022 · 1 comment
Open

Add Zoom for Control.Monad.Trans.WriterT.CPS #1014

ocharles opened this issue Dec 12, 2022 · 1 comment

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@ocharles
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@ocharles
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I think it's:

type instance Zoomed (WriterT w m) = FocusingPlus w (Zoomed m)


instance (Monoid w, Zoom m n s t) => Zoom (WriterT w m) (WriterT w n) s t where
  zoom l = writerT . zoom (\afb -> unfocusingPlus . l (FocusingPlus . afb)) . runWriterT

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@ocharles