><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&amp;&gt;</span></code>
      treats it wrapped pseudo-object much as a real value, a true real reference
      is stored so aliasing will ocurr:
    </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
        Copies of <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifie