-spec"></a>Class template
  <code>bases&lt;T1, T2,</code>...<code>TN&gt;</code></h3>

  <p>An <a href="../../../mpl/doc/refmanual/forward-sequence.html">MPL
  sequence</a> which can be used in
  <code>class_&lt;</code>...<code>&gt;</code> instantiations indicate a list
  of base classes.</p>

  <h4><a name="bases-spec-synopsis" id="bases-spec-synopsis"></a>Class
  template <code>bases</code> synopsis</h4>
  <pre>
namespace boost { namespace python
{
  template &lt;T1 = <i>unspecified</i>,...T<i>n</i> = <i>u