syb: Scrap Your Boilerplate! ================================================================================ Scrap Your Boilerplate (SYB) is a library for generic programming in Haskell. It is supported since the GHC >= 6.0 implementation of Haskell. Using this approach, you can write generic functions such as traversal schemes (e.g., everywhere and everything), as well as generic read, generic show and generic equality (i.e., gread, gshow, and geq). This approach is based on just a few primitives for type-safe cast and processing constructor applications. It was originally developed by Ralf Lämmel and Simon Peyton Jones. Since then, many people have contributed with research relating to SYB or its applications. More information is available on the webpage: http://www.cs.uu.nl/wiki/GenericProgramming/SYB What's new ---------- The biggest improvements from version 0.1 are: * Reintegration of the testsuite; * Introduction of the Generics.SYB.* module hierarchy (as synonyms for their Data.Generics.* counterparts); * Adding gshows :: Data a => a -> ShowS (more efficient than gshow); * Adding gmapAccumA :: forall b d a. (Data d, Applicative a) => (forall e. Data e => b -> e -> (b, a e)) -> b -> d -> (b, a d) ; * Adding ext1B :: (Data a, Typeable1 t) => a -> (forall b. Data b => (t b)) -> a ; * Introduction of two new generic producers ('empty' and 'constrs'). The former produces an empty value of a given datatype, while the latter produces a list of values of a datatype, each using a different constructor. Features -------- * Easy generic programming with combinators * GHC can derive Data and Typeable instances for your datatypes * Comes with many useful generic functions Requirements ------------ * GHC 6.10.1 or later * Cabal 1.6 or later Download -------- Get the package: http://hackage.haskell.org/package/syb Get the source: darcs get http://code.haskell.org/syb/ Bugs & Support -------------- Please report issues or request features at the bug tracker: http://code.google.com/p/scrapyourboilerplate/issues/list For discussion about the library with the authors, maintainers, and other interested persons use the mailing list: http://www.haskell.org/mailman/listinfo/generics