ing the
property maps with key-value data, it constructs a
<tt class="docutils literal"><span class="pre">dynamic_properties</span></tt> object and adds to it both property maps,
keyed on the strings &quot;age&quot; and &quot;gpa&quot;.  Finally <tt class="docutils literal"><span class="pre">manipulate_freds_info</span></tt>
is passed the <tt class="docutils literal"><span class="pre">dynamic_properties</span></tt> object and the results of its changes are
displayed.</p>
<p>As shown above, the <tt class="do