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Many generic programs require information about the recursive positions of a datatype. Examples include the generic fold, generic rewriting or the Zipper data structure. Several generic programming systems allow to write such functions by viewing datatypes as fixed points of a pattern functor. Traditionally, this view has been limited to so-called regular datatypes such as lists and binary trees. In particular, systems of mutually recursive datatypes have been excluded.

With the multirec library, we provide a mechanism to talk about fixed points of systems of datatypes that may be mutually recursive. On top of this representations, generic functions such as the fold or the zipper can then be defined.

We expect that the library will be especially interesting for compiler writers, because ASTs are typically systems of mutually recursive datatypes, and with multirec it becomes easy to write generic functions on ASTs.

The library is based on ideas described in the paper:


Get the latest version of multirec from Hackage:
cabal install multirec


The repository for multirec is on Github.

Bug reports

The bug tracker for multirec is also on Github.

-- AndresLoeh - 30 Oct 2011
Topic revision: r6 - 30 Oct 2011, AndresLoeh

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