TernaryTrees: Efficient pure ternary trees

Ternary trees are an efficient structure often used for storing strings for fast lookups. This package implements a generic tree for storing lists of Ord instances, and a specialised String implementation which is about 30% faster than the generic version. br/ An example program is provided what shows how to use the package as a dictionary program for spell checking, and how it can be used to serialise data with Don Stewart's Data.Binary package. br/ From my testing, using the usrshartdictwords file on my system (over 230,000 words), inserting all words, checking they all exist in the tree, writing them to a binary file, reading them back in and checking the read in result is the same as the original takes slightly over 3 seconds using the StringSet. The written file is also slightly smaller than the input (by about 10% for shuffled data, and 7% for in order data). br/ Future releases (coming very soon) will also have Map structures for key/value lookups. br/ New n this version: br/ ul liAdded Data.Map.TernaryMap/li /ul

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• AlexMason

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