t::any&amp;, const boost::any&amp;)
    &gt;&amp; fn)
</pre>
<p>A <tt class="docutils literal"><span class="pre">dynamic_properties</span></tt> object can be constructed with a function object
that, when called, creates a new property map.  The library provides the
<tt class="docutils literal"><span class="pre">ignore_other_properties</span></tt> function object, which lets the <tt class="docutils literal"><span class="pre">dynamic_properties</span></tt> object ignore any properties that it hasn't been prep