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observer ======== This is a Haskell implementation of the Observer design pattern [1,2], providing a typeclass and an example implementation (Synchronous) which is perfectly usable in its own right. This package is based on Observable.hs by Bastiaan Heeren , originally published as part of an exercise  for his students. It has been modified, extended and packaged by Andy Gimblett [5,6]. Changelog --------- 2009.10.30 v0.0.1 - first Cabalised version. --  Gamma et al: `Design Patterns: Elements of Reusable Object-Oriented Software', Addison-Wesley, 1994.  http://en.wikipedia.org/wiki/Observer_pattern  http://people.cs.uu.nl/bastiaan/  http://www.cs.uu.nl/wiki/bin/view/Afp0607/ExerciseWXHaskell  http://www.cs.swan.ac.uk/~csandy/  email:firstname.lastname@example.org