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| <Head> |
| <Title>Property</Title> |
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| <BR Clear> |
| |
| <H2><A NAME="concept:PropertyTag"></A> |
| PropertyTag |
| </H2> |
| |
| A Property Tag is a type used to name or identify properties that are |
| attached to the vertices and edges of a graph. A Property type is not |
| the type of the actual property values. Objects of the Property type |
| are not used except to carry the type information which specifies the |
| property. See the section about <A |
| href="using_adjacency_list.html#sec:custom-edge-properties"> Custom |
| Edge Properties</a> for a description of how to define your own |
| property tags. |
| |
| |
| <h3>Associated Types</h3> |
| |
| <table border> |
| |
| <tr> |
| <td>Property Kind </td> |
| <td><TT>property_kind<PropertyTag>::type</TT> </td> |
| <td> |
| |
| This specifies whether the property is a <a |
| name="VertexPropertyTag"><b>Vertex Property Tag</b></a> |
| (<tt>vertex_property_tag</tt>), an <a |
| name="EdgePropertyTag"><b>Edge Property Tag</b></a> (<tt>edge_property_tag</tt>), or |
| a <a name="GraphPropertyTag"><b>Graph Property Tag</b></a> which is attached to the |
| graph object itself (<tt>graph_property_tag</tt>). The tags are |
| defined in <a |
| href="../../../boost/graph/properties.hpp"><tt>boost/graph/properties.hpp</tt></a>. The <tt>property_kind</tt> traits class is defined in <a href="../../../boost/pending/property.hpp"><tt>boost/pending/property.hpp</tt></a>. |
| |
| </td> |
| </tr> |
| |
| <tr> |
| <td>Property ID Number </td> |
| <td><TT>property_num<PropertyTag>::value</TT> </td> |
| <td> |
| This is needed as a workaround when using compilers that do not |
| support partial specialization (and hence prevent us from using |
| <tt>boost::is_same</tt> to detect if two property tags are the same). |
| The <tt>property_num</tt> traits class is defined in <a |
| href="../../../boost/pending/property.hpp"><tt>boost/pending/property.hpp</tt></a>. |
| </td> |
| </tr> |
| |
| </table> |
| |
| <h3>Refinement of</h3> |
| |
| <a |
| href="http://www.sgi.com/tech/stl/DefaultConstructible.html">Default Constructible</a> |
| |
| |
| <h3>Models</h3> |
| |
| The following models of the Property Tag concept are defined |
| in <a |
| href="../../../boost/graph/properties.hpp"><tt>boost/graph/properties.hpp</tt></a>. |
| |
| <ul> |
| <li><tt>vertex_index_t</tt></li> |
| <li><tt>edge_index_t</tt></li> |
| <li><tt>graph_name_t</tt></li> |
| <li><tt>vertex_name_t</tt></li> |
| <li><tt>edge_name_t</tt></li> |
| <li><tt>edge_weight_t</tt></li> |
| <li><tt>vertex_distance_t</tt></li> |
| <li><tt>vertex_color_t</tt></li> |
| <li><tt>vertex_degree_t</tt></li> |
| <li><tt>vertex_out_degree_t</tt></li> |
| <li><tt>vertex_in_degree_t</tt></li> |
| <li><tt>vertex_discover_time_t</tt></li> |
| <li><tt>vertex_finish_time_t</tt></li> |
| </ul> |
| |
| <h3>See Also</h3> |
| |
| <a href="./PropertyGraph.html">PropertyGraph</a> |
| and |
| <a href="../../property_map/doc/property_map.html">Property Map Concepts</a> |
| |
| <h3>Notes</h3> |
| |
| On compilers that do not support partial specialization, each Property |
| type is also required to specialize |
| <tt>property_num<PropertyTag></tt> to contain an enum named |
| <tt>value</tt> which uniquely identifies the property type. |
| |
| <br> |
| <HR> |
| <TABLE> |
| <TR valign=top> |
| <TD nowrap>Copyright © 2000-2001</TD><TD> |
| <A HREF="http://www.boost.org/people/jeremy_siek.htm">Jeremy Siek</A>, Indiana University (<A HREF="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</A>) |
| </TD></TR></TABLE> |
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