ropertyMap</a>
with a key type the same as the graph's vertex or edge descriptor type.
</td>
</tr>

<tr>
<td><pre>boost::property_map&lt;G, PropertyTag&gt;::const_type</pre>
The type of the const property map for the property specified by
<TT>PropertyTag</TT>. This type must be a model of <a
href="../../property_map/doc/ReadablePropertyMap.html">ReadablePropertyMap</a>
with a key type the same as the graph's vertex or edge descriptor type.
</td>
</tr>

</table>

<h3>Valid Expressions</h3>

<table border>

<