="anchor" href="#arg-x"></a></dt>
<dd><p><code>R</code> object of <code>ANY</code> type for <code>as.deque()</code> and <code>is.deque()</code>
or of class <code>Deque</code> for the <code>S3</code> methods.</p></dd>

</dl></div>
    <div class="section level2">
    <h2 id="details">Details<a class="anchor" aria-label="anchor" href="#details"></a></h2>
    <p>Methods that alter <a href="Deque.html">Deque</a> objects usually come in two versions
providing either copy or reference semantics where the latter s