ar-time operation.</p></li>
<li class="listitem">
<p><span class="bold"><strong>Pass a token to
        disconnect</strong></span>: this approach identifies slots with a
        token that is easily comparable (e.g., a string), enabling
        slots to be arbitrary function objects. While this approach is
        essentially equivalent to the connection approach taken by Boost.Signals2,
        it is possibly more error-prone for several reasons:</p>
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