bling copy constructor. </p>
        <p>Note that this class does not derive from <a class="link" href="db_set_base_iterator.html" title="Chapter 18.  Db_set_base_iterator">db_set_base_iterator</a>
 but from <a class="link" href="db_map_iterator.html" title="Chapter 16.  Db_map_iterator">db_map_iterator</a>
. </p>
        <div class="sect3" lang="en" xml:lang="en">
          <div class="titlepage">
            <div>
              <div>
                <h4 class="title"><a id="idp51333600"></a>Parameters