at T itself
    gets initialized with a similar initial <code>PyObject*</code> argument
    by specializing <a href=
    "has_back_reference.html#has_back_reference-spec">has_back_reference&lt;T&gt;</a>.</li>
  </ol>

  <h4><a name="class_-spec-synopsis" id="class_-spec-synopsis"></a>Class
  template <code>class_</code> synopsis</h4>
  <pre>
namespace boost { namespace python
{
  template &lt;class T
   <font color="#007F00">   , class Bases = bases&lt;&gt;
            , class HeldType = T
            , cla