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Add Context instances for Contravariant, Divisible, Decidable #577

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maxsnew wants to merge 1 commit into jaspervdj:master from maxsnew:master

maxsnew commented Oct 31, 2017

This gives us a few useful new combinators for manipulating Contexts.
Most useful are probably

divided :: Context a -> Context b -> Context (a, b)

Which lets you combine two existing contexts to make a context for a pair and

chosen :: Context a -> Context b -> Context (Either a b)

Which lets you write a context for data which might be one of two cases.

I've needed divided for my site, and currently the only way to get it is to peek under the definition of Context.


          Add Context instances for Contravariant, Divisible, Decidable

a3d3973

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