   <span class="identifier">iterator_policies</span><span class="special">::</span><span class="identifier">first_owner</span>
      <span class="special">,</span> <span class="identifier">iterator_policies</span><span class="special">::</span><span class="identifier">no_check</span>
      <span class="special">,</span> <span class="identifier">iterator_policies</span><span class="special">::</span><span class="identifier">buffering_input_iterator</span>
      <span class="special">,</span> <span class="ide