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<td><p><span class="term">Effects:</span></p></td>
<td><p>Initializes the signal to contain no slots, copies the given combiner into internal storage, and stores the given group comparison function object to compare groups.</p></td>
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<td><p><span class="term">Postconditions:</span></p></td>
<td><p><code class="computeroutput">this-&gt;<a class="link" href="signal.html#id-1_3_37_6_9_3_1_2_24_5-bb">empty</a>()</code></p></td>
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