Fast containers with good tests.
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SortedSet: A sorted set with no duplicates like Ruby's SortedSet but built using C++ STL's std::set.
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SortedHash: An associative array hashed by the keys ordered by the values. Used to build the catmist matching algorithm as the builtin SortedSet class turned out not to be that great. Built using the Boost Multi-index Containers Library.
Full documentation can be found at rubydoc.info.