e><p class="javadoc">Returns:</p><div class="indent inline-content"><p>a reference to <code>out</code>.</p></div></div></div><div class="field "><a name="isEmpty"></a><h3 class="anchor"><code><a href="#isEmpty"><span class="identifier">isEmpty</span></a> ():<span class="type">Bool</span></code></h3><div class="doc"><p>Unsupported operation; always returns false.</p></div></div><div class="field "><a name="iter"></a><h3 class="anchor"><code><span class="label label-inline">inline</span><a href="#iter"><span 