Efficient relational queries on Haskell sets. http://happstack.com
|Latest on Hackage:||6.0.1|
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Just pick which parts of your data structures you want indexed using an easy to use template-haskell function. Spare yourself the need to write, run, and maintain code that marshalls your data to/from an external relational database just for efficient queries. happstack-ixset relies on generics and TH to spare you the boilerplate normally required for such tasks.