<p>I removed <code>RectangleTree::Children()</code>. Thus, <code>SplitType</code> and <code>AuxiliaryInformationType</code> become friend classes of the <code>RectangleTree</code> class.<br>
Moreover, I made some RectangleTree::NumDescendants() optimizations proposed by Marcos Pividori.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>&nbsp;&nbsp;<a href='https://github.com/mlpack/mlpack/pull/711'>https://github.com/mlpack/mlpack/pull/711</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Remove RectangleTree:Children().</li>
  <li>RectangleTree:NumDescendants() optimization</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/711/files#diff-0">src/mlpack/core/tree/rectangle_tree/discrete_hilbert_value_impl.hpp</a>
    (28)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/711/files#diff-1">src/mlpack/core/tree/rectangle_tree/dual_tree_traverser_impl.hpp</a>
    (4)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/711/files#diff-2">src/mlpack/core/tree/rectangle_tree/hilbert_r_tree_auxiliary_information_impl.hpp</a>
    (14)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/711/files#diff-3">src/mlpack/core/tree/rectangle_tree/hilbert_r_tree_descent_heuristic_impl.hpp</a>
    (4)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/711/files#diff-4">src/mlpack/core/tree/rectangle_tree/hilbert_r_tree_split_impl.hpp</a>
    (87)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/711/files#diff-5">src/mlpack/core/tree/rectangle_tree/r_star_tree_descent_heuristic_impl.hpp</a>
    (44)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/711/files#diff-6">src/mlpack/core/tree/rectangle_tree/r_star_tree_split_impl.hpp</a>
    (87)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/711/files#diff-7">src/mlpack/core/tree/rectangle_tree/r_tree_descent_heuristic_impl.hpp</a>
    (30)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/711/files#diff-8">src/mlpack/core/tree/rectangle_tree/r_tree_split_impl.hpp</a>
    (59)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/711/files#diff-9">src/mlpack/core/tree/rectangle_tree/rectangle_tree.hpp</a>
    (13)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/711/files#diff-10">src/mlpack/core/tree/rectangle_tree/rectangle_tree_impl.hpp</a>
    (72)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/711/files#diff-11">src/mlpack/core/tree/rectangle_tree/single_tree_traverser_impl.hpp</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/711/files#diff-12">src/mlpack/core/tree/rectangle_tree/x_tree_split_impl.hpp</a>
    (103)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/711/files#diff-13">src/mlpack/tests/rectangle_tree_test.cpp</a>
    (147)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/mlpack/mlpack/pull/711.patch'>https://github.com/mlpack/mlpack/pull/711.patch</a></li>
  <li><a href='https://github.com/mlpack/mlpack/pull/711.diff'>https://github.com/mlpack/mlpack/pull/711.diff</a></li>
</ul>

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