up_type</span><span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">slot_type</span><span class="special">&amp;</span><span class="special">,</span> 
                     <span class="identifier">connect_position</span> <span class="special">=</span> <span class="identifier">at_back</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="connection.html" title="Class connection">connection</a> <a class=