span class="keyword">const</span> <a class="link" href="connection.html" title="Class connection">connection</a> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">T1</span><span class="special">,</span> <span class="special">...</span><span class="special">,</span> <span class="identifier">TN</span><span class="special">)</span><span class="special">,</span> <span class="identifier">ExtendedSlotFunction</span><span class="special">&gt;</span> <a class="link" href="sig