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mdds 0.3.0
* implemented point_quad_tree.
mdds 0.2.1
* added example files on how to use these data structures.
* fixed a bug in segment_tree::search_result object, to make it work
with empty result set.
* fixed segment_tree to make it really usable outside of unit test code.
mdds 0.2.0
* other general performance improvements.
* lots of code cleanups.
* support for search result iterator in segment_tree and
rectangle_set, for better search performance.
* implemented rectnagle_set.
* fixed lots of bugs in the segment_tree implementation.
mdds 0.1.2
* implemented segment_tree.
* node_base class is now without virtual methods to avoid vtable
generation.
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