The emgm package
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.
|Versions||0.1, 0.2, 0.3, 0.3.1, 0.4|
|Dependencies||base (≥3.0 & <5.0)|
|Copyright||(c) 2008 - 2011 Universiteit Utrecht|
|Author||Sean Leather, José Pedro Magalhães, Alexey Rodriguez, Andres Löh|
|Source repository||git clone git://github.com/spl/emgm.git|
|Upload date||Wed Sep 21 15:58:05 UTC 2011|