 is (convertible to) a
            group name, any slots in the given group are
            disconnected. Otherwise, any slots equal to the
            given slot function
            are disconnected.
            </p>
<p>Note, the <code class="computeroutput">slot_func</code>
            argument should not be an actual <a class="link" href="slot.html" title="Class template slot">signals2::slot</a>
            object (which does not even support <code class="computeroutput">operator==</code>), but rather
 