="Struct template make_unordered_set_base_hook">make_unordered_set_base_hook</a> <span class="special">{</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">implementation_defined</span> <a name="boost.intrusive.make_unordered_idp65807072.type"></a><span class="identifier">type</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.19.43.45.3.4"></a><h2>Des