insertion of n elements in the index </p>
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<pre class="literallayout"><span class="keyword">void</span> <a name="idp55198160-bb"></a><span class="identifier">shrink_to_fit</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>This tries to free unused memory previously allocated. </p>
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<li class="listitem"><pre class="literallayout"><span class="identifier">iterator</span> <a name="idp55199456-bb"></a><span class="identifier