 class="special">++(</span><span class="keyword">int</span><span class="special">);</span>
<span class="keyword">private</span><span class="special">:</span>
  <span class="identifier">UnaryFunction</span> <span class="identifier">m_f</span><span class="special">;</span>     <span class="comment">// exposition only</span>
<span class="special">};</span>
</pre>
<h4>
<a name="iterator.specialized.function_output.h3"></a>
        <span class="phrase"><a name="iterator.specialized.function_output.requirements">