"identifier">iterate_a2m</span>
  <span class="special">,</span> <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">functor_input</span>
  <span cl