pan>
      <span class="special">:</span> <span class="identifier">buf</span><span class="special">(</span> <span class="identifier">fd</span> <span class="special">),</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream</span><span class="special">(</span> <span class="special">&amp;</span><span class="identifier">buf</span> <span class="special">)</span> <span class="special">{}</span>
    <span class="comment">//...</span>
<span class="special">};</spa