y the <code><a href="Protocols/Router.html">Router</a></code> to find out if some <code>UIViewController</code>
instance is integrated into the view controller stack</p>

                        <a href="Protocols/Finder.html" class="slightly-smaller">See more</a>
                      </div>
                      <div class="declaration">
                        <h4>Declaration</h4>
                        <div class="language">
                          <p class="aside-title">Swift</p>
                   