      </ul>
            </li>
          </ul>
        </nav>
<p>In contrast to std::unordered_set::const_iterator, this one is bidirectional.</p>
        <section id="pub-types">
          <h2><a href="#pub-types">Public types</a></h2>
          <dl class="m-doc">
            <dt id="aa5269925b22272f53a0cbbf7f858f23e">
              using <a href="#aa5269925b22272f53a0cbbf7f858f23e" class="m-doc-self">key_type</a> = <a href="classbn_1_1iunordered__set.html#ad403ce26423f55d0d1c7de9605ecaffb" class="m-doc">iu