e to speed up searches and insertions in unordered_multisets with a great number of with equivalent keys. </p>
<div class="refsect2">
<a name="id-1.3.19.43.45.4.4.9"></a><h3>
<a name="boost.intrusive.unordered_set_base_hookconstruct-copy-destruct"></a><code class="computeroutput">unordered_set_base_hook</code> 
        public
       construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="idp65840432-bb"></a><span class