>
<th>Type</th><th>Description</th>
</tr>

<tr>
<td><tt>
boost::property_traits&lt;ref_property_map&gt;::value_type
</tt></td>
<td>
This type is the <tt>ValueType</tt> with which the template was instantiated.
</td>
</tr>

<tr>
<td><tt>
boost::property_traits&lt;ref_property_map&gt;::key_type
</tt></td>
<td>
This type is the <tt>KeyType</tt> with which the template was instantiated.
</td>
</tr>

<tr>
<td><tt>
boost::property_traits&lt;ref_property_map&gt;::category
</tt></td>
<td>
This type is <tt>boost::lv