ristics: "union by rank" and "path compression" are
  used to speed up the operations&nbsp;[<a href=
  "./bibliography.html#tarjan83:_data_struct_network_algo">1</a>, <a href=
  "./bibliography.html#clr90">2</a>].</p>

  <h3>Where Defined</h3><a href=
  "../../boost/pending/disjoint_sets.hpp"><tt>boost/pending/disjoint_sets.hpp</tt></a>

  <h3>Template Parameters</h3>

  <table border summary="">
    <tr>
      <td><tt>Rank</tt></td>

      <td>must be a model of <a href=
      "../property_map/doc/ReadWrit