EMGM is a general-purpose library for datatype-generic programming.

The design is based on the idea of modeling algebraic datatypes as sum-of-product structures. Many datatypes can be modeled this way, and because they all share a common structure, we can write generic functions that work on this structure.

The primary features of the library are:

• A foundation for building generic functions. EMGM includes a collection of datatypes (e.g. sum, product, and unit) and type classes (e.g. Generic and Rep). Everything you need for defining generic functions and supporting datatypes can be found here.

• Many useful generic functions. These provide a wide range of functionality. For example, there is crush, a generalization of the foldl/foldr functions, that allows you to flexibly extract the elements of a polymorphic container. Now, you can do many of the operations with your container that were previously only available for lists.

• Support for standard datatypes. EMGM supports standard types: primitives (e.g. Int and Float), Bool, lists, tuples, Maybe, etc.

NOTE: As of version 0.4, this library does not have Template Haskell for generating the representation. We are working on another library for a solution to this problem.

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