class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>

  <span class="comment">// public data members</span>
  <span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span> <span class="identifier">x</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp40174416"></a><h2>Description</h2>
<p>A multis