lass="identifier">allocator_type</span> <span class="special">&amp;</span> a <span class="special">=</span> <span class="identifier">allocator_type</span><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span></pre>
<p><span class="bold"><strong>Effects</strong></span>: Constructs an empty multiset using the specified comparison object and allocator.</p>
<p><span class="bold"><strong>Complexity</strong></span>: Constant. </p>
</li>
<li class="