ef="ch08s06.html" title="From V2.22 to V2.23 (Boost 1.50)"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">From V2.23 to V2.24 (Boost 1.51)</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch08s04.html">Prev</a>&nbsp;</td><th width="60%" align="center">Chapter&nbsp;8.&nbsp;Version history</th><td width="20%" align="right">&nbsp;<a accesskey="n" hr