0</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="ratio.html#ratio.overview">Overview</a></span></dt>
<dt><span class="section"><a href="ratio/users_guide.html">User's Guide</a></span></dt>
<dt><span class="section"><a href="ratio/reference.html">Reference </a></span></dt>
<dt><span class="section"><a href="ratio/appendices.html">Appendices</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="signals2.html">36. Boost.Signals2</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="s