lass="special">&amp;</span> <span class="identifier">f</span><span class="special">);</span>

  <span class="comment">/* see below */</span> <span class="keyword">operator</span><span class="special">*();</span>
  <span class="identifier">function_output_iterator</span><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">++();</span>
  <span class="identifier">function_output_iterator</span><span class="special">&amp;</span> <span class="keyword">operator</span><span