Include all the necessary files to use the Rectangle Type Trees (RTree, RStarTree, XTree, and HilbertRTree).
mlpack is free software; you may redistribute it and/or modify it under the terms of the 3-clause BSD license. You should have received a copy of the 3-clause BSD license along with mlpack. If not, see http://www.opensource.org/licenses/BSD-3-Clause for more information.
Definition in file rectangle_tree.hpp.