y&amp; key,
         const Value&amp; value)
</pre>
<p>This function adds a key-value pair to the property map with the
matching name and key type. If no matching property map is found,
behavior depends on the availability of a property map generator.  If
a property map generator was supplied when the <tt class="docutils literal"><span class="pre">dynamic_properties</span></tt>
object was constructed, then that function is used to create a new
property map.  If the generator fails to generate a property map