e classes yet, but they are almost identical to
<tt class="docutils literal"><span class="pre">boost::ptr_set&lt;T&gt;</span></tt>, <tt class="docutils literal"><span class="pre">boost::ptr_map&lt;Key,T&gt;</span></tt> and <tt class="docutils literal"><span class="pre">boost::ptr_array&lt;T,N&gt;</span></tt>, respectively.
The underlying containers stem from the two boost libraries</p>
<ul class="simple">
<li><a class="reference" href="../../unordered/index.html">Boost.Unordered</a></li>
<li><a class="refer