            <a name="/Helper%20Types"></a>
                <a name="//apple_ref/swift/Section/Helper Types" class="dashAnchor"></a>
                <div class="section-name-container">
                  <a class="section-name-link" href="#/Helper%20Types"></a>
                  <h3 class="section-name"><p>Helper Types</p>
</h3>
                </div>
              </div>
              <ul class="item-container">
                <li class="item">
                  <div>
                    <code>
           