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ocharles.org.uk Special Pages 24 Days of GHC Extensions 24 Days of Hackage 2013 24 Days of Hackage 2012 All Posts The list of monoids pattern Monad Transformers and Effects with Backpack Who Authorized These Ghosts!? Solving Planning Problems with Fast Downward and Haskell Providing an API for extensible-effects and monad transformers Announcing transformers-eff Monad transformers, free monads, mt
24 Days of GHC Extensions
24 Days of GHC Extensions Welcome View Patterns Pattern Synonyms Record WildCards Bang Patterns Rebindable Syntax List Comprehensions Type Operators Recursive Do Nullary Type Classes Implicit Parameters Type Families Multi Param Type Classes Functional Dependencies Deriving Derive Generic Overloaded Strings Rank N Types Existential Quantification Scoped Type Variables Arrows Template Haskell Stati
24 Days of GHC Extensions: Welcome!
Hello everyone, I’m pleased to announce it’s that time of the year again! Following in the tradition of 24 Days of Hackage 2012 and 2013, it’s time for another advent calendar. However, this year I felt it could be fun to try something a little different. The previous years have concentrated on using libraries available on Hackage, and this is naturally a very important part of working in Haskell.
Building data constructors with GHC Generics
Let’s imagine for a moment that we are in the presence of the following data type: data Coffee = MkCoffee { coffeeBeans :: String , coffeeOriginCountry :: Country , coffeeBrewMethod :: BrewMethod } deriving (Generic) However, we have only been given the type itself - and not a constructor for this value. That is, we don’t have access to this function: Is it still possible to make Coffee? As we’ll
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