 source file without triggering the error, you
          can always pass a reference to the <code>class_</code> object to a
          function in another source file, and call some of its member
          functions (e.g. <code>.def(...)</code>) in the auxilliary source
          file:

          <p><code><b>more_of_my_class.cpp</b></code>:</p>
<pre>
void more_of_my_class(class&lt;my_class&gt;&amp; x)
{
   x
     .def("baz", baz)
     .add_property("xx", &amp;my_class::get_xx, &amp;my_class::set_xx)
     ;

