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<a name="idp55195584-bb"></a><code class="computeroutput">iunordered_set_index</code> public member functions</h3>
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<pre class="literallayout"><span class="keyword">void</span> <a name="idp55196144-bb"></a><span class="identifier">reserve</span><span class="special">(</span><span class="identifier">size_type</span> new_n<span class="special">)</span><span class="special">;</span></pre>
<p>This reserves memory to optimize the 