ass="special">)</span>
<span class="special">{</span>
    <span class="keyword">return</span> <span class="identifier">boost_asio_handler_invoke_helpers</span><span class="special">::</span><span class="identifier">invoke</span><span class="special">(</span><span class="identifier">f</span><span class="special">,</span> <span class="identifier">op</span><span class="special">-&gt;</span><span class="identifier">d_</span><span class="special">-&gt;</span><span class="identifier">h</span><span class="special"