<p>Changed functions in the Tree Type API to use references. Refactored all relevant files.<br>
Functions changed:</p>

<pre><code>ElemType MinDistance(const TreeType* other);
ElemType MaxDistance(const TreeType* other);
math::RangeType&lt;ElemType&gt; RangeDistance(const TreeType* other);
</code></pre>

<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/788'>https://github.com/mlpack/mlpack/pull/788</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>binary_space_tree.hpp #787 fix</li>
  <li>binary_space_tree_impl.hpp #787 fix</li>
  <li>cover_tree.hpp #787 fix</li>
  <li>binary_space_tree_impl.hpp #787 fix</li>
  <li>cover_tree_impl.hpp #787 fix</li>
  <li>function signature changed</li>
  <li>minor refactoring</li>
  <li>function signature changed</li>
  <li>refactored src/mlpack/methods/*/ - updated MinDistance(), MaxDistance() and RangeDistance() calls</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/788/files#diff-0">src/mlpack/core/tree/binary_space_tree/binary_space_tree.hpp</a>
    (12)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/788/files#diff-1">src/mlpack/core/tree/binary_space_tree/binary_space_tree_impl.hpp</a>
    (8)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/788/files#diff-2">src/mlpack/core/tree/cover_tree/cover_tree.hpp</a>
    (12)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/788/files#diff-3">src/mlpack/core/tree/cover_tree/cover_tree_impl.hpp</a>
    (38)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/788/files#diff-4">src/mlpack/core/tree/rectangle_tree/rectangle_tree.hpp</a>
    (12)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/788/files#diff-5">src/mlpack/core/tree/rectangle_tree/rectangle_tree_impl.hpp</a>
    (4)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/788/files#diff-6">src/mlpack/core/tree/spill_tree/spill_tree.hpp</a>
    (12)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/788/files#diff-7">src/mlpack/methods/emst/dtb_rules_impl.hpp</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/788/files#diff-8">src/mlpack/methods/kmeans/dual_tree_kmeans_rules_impl.hpp</a>
    (4)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/788/files#diff-9">src/mlpack/methods/neighbor_search/sort_policies/furthest_neighbor_sort_impl.hpp</a>
    (6)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/788/files#diff-10">src/mlpack/methods/neighbor_search/sort_policies/nearest_neighbor_sort_impl.hpp</a>
    (6)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/mlpack/mlpack/pull/788/files#diff-11">src/mlpack/methods/range_search/range_search_rules_impl.hpp</a>
    (2)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/mlpack/mlpack/pull/788.patch'>https://github.com/mlpack/mlpack/pull/788.patch</a></li>
  <li><a href='https://github.com/mlpack/mlpack/pull/788.diff'>https://github.com/mlpack/mlpack/pull/788.diff</a></li>
</ul>

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