eans used for the return value
                    of a wrapped C++ function returning T. When T is a class type,
                    that normally means *x is copy-constructed into the new Python
                    object.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    boost::reference_wrapper&lt;T&gt;
                  </p>
                </td>
<td>
                  <p>
                    The Python argument contains a pointer to, rather than a c