s="keyword">class</span> <span class="identifier">Function</span><span class="special">&gt;</span>
<span class="keyword">friend</span>
<span class="keyword">void</span> <span class="identifier">asio_handler_invoke</span><span class="special">(</span><span class="identifier">Function</span><span class="special">&amp;&amp;</span> <span class="identifier">f</span><span class="special">,</span> <span class="identifier">read_frame_op</span><span class="special">*</span> <span class="identifier">op</span><span cl