ch <code>B</code> in <code>bases</code>, an instance of
  <code>class_&lt;B<font color="#007F00">, ...</font>&gt;</code> must have
  already been constructed.
  <pre>
class_&lt;Base&gt;("Base");
class_&lt;Derived, bases&lt;Base&gt; &gt;("Derived");
</pre>Revised 
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
   1 November, 2005 <!--webbot bot="Timestamp" endspan i-checksum="39359" -->

  <p><i>&copy; Copyright <a href="http://www.boost.org/people/dave_abrahams.htm">Dave
  Abr