=</span> <span class="identifier">system</span><span class="special">::</span><span class="identifier">default_queue</span><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> KeyIterator<span class="special">,</span> <span class="keyword">typename</span> ValueIterator<span class="special">&gt;</span> 
  <span class="keyword">void</sp