A collection of multi-dimensional data structure and indexing algorithm.
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 This is a C++ library, and is a collection of various data structures designed
 to efficiently store and query multi-dimensional data for various
 filtering criteria. Different structures are optimized for different
 query needs.
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 This library is a source-code only library. It’s designed to be
 header-only meaning that the user program does not need to link to any
 additional shared library in order to use these data structures. The
 data structures are all available as C++ templates.