MoreMoney | Constraing solving using functional methods in C | Functional Programming library
kandi X-RAY | MoreMoney Summary
kandi X-RAY | MoreMoney Summary
Constraing solving using functional methods in C++, Haskell, and Scala/Scalaz. See the series of blog posts. Inspired by Justin Le's blog post and Douglas M. Auclair's article MonadPlus: What a Super Monad! in the Monad Reader.
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QUESTION
I would like to define a typeclass for accessing specific fields in records based on their type. In this toy example, we have a Failable (that's just an Either) that can be present in different records and wrapping different types. I'm interested if it would be possible to define a single function failableFrom and let the compiler select the correct instance based on the context.
...ANSWER
Answered 2019-Feb-08 at 20:40a typeclass for accessing specific fields in records based on their type
Something like this can be accomplished using generic programming, a technique for inspecting the structure of data types and defining functions that work across diverse data types according to the structure of each.
To use generic programming, one must enable the DeriveGeneric
extension and import the GHC.Generics
module.
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