he
              <a class="link" href="signal.html#id-1_3_37_6_9_3_1_2_24_2-bb">connect_extended</a> methods.  The <code class="computeroutput">extended_slot_type</code>
              has an additional <a class="link" href="connection.html" title="Class connection">signals2::connection</a> argument in its signature,
              which gives slot functions access to their connection to the signal
              invoking them.
            </p>
</li>
<li class="listitem">
<p>
<span class="keyword">typedef</spa