iv class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch08s04.html">Prev</a>&nbsp;</td><td width="20%" align="center"><a accesskey="u" href="ch08.html">Up</a></td><td width="40%" align="right">&nbsp;<a accesskey="n" href="ch08s06.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">From V2.24 to V2.25 (Boost 1.54)&nbsp;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%"