Prepare for 2.0 release #19
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Oh, actually, there was the newtype iso thing that we could include here too, right? |
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| instance monadCostar :: Monad (Costar f a) | ||
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| instance distributiveCostar :: Distributive f => Distributive (Costar f a) where | ||
| distribute f = Costar \g -> map ((_ $ g) <<< unCostar) f | ||
| distribute f = Costar \a -> map (\(Costar g) -> g a) f |
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Do we need the Distributive constraint on f here?
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Looks good. Yes, having something like mapNewtype :: forall new old p. (Newtype new old, Profunctor p) => p old old -> p new newwould be good, but we can leave it for a minor release if you like. |
| wrapIso :: forall t a p. (Newtype t a, Profunctor p) => p t t -> p a a | ||
| wrapIso = dimap wrap unwrap | ||
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| unwrapIso :: forall t a p. (Newtype t a, Profunctor p) => p a a -> p t t |
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Do you think we need a a -> t argument here to make type inference work in some cases?
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Ah good point, probably. I was going to ask though - do we need both versions here? I know you can turn a profunctor iso lens around, but you need to bring lenses in for that, right?
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I think both are potentially useful, right? Actually, are these the wrong way around?
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Only if you think the names should make sense... ahem.
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On that note, are these names any good anyway?
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