118 lines
3.5 KiB
HTML
118 lines
3.5 KiB
HTML
<HTML>
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<!--
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Copyright (c) Jeremy Siek 2000
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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-->
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<Head>
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<Title>Property</Title>
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<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b"
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ALINK="#ff0000">
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<IMG SRC="../../../boost.png"
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ALT="C++ Boost" width="277" height="86">
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<BR Clear>
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<H2><A NAME="concept:PropertyTag"></A>
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PropertyTag
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</H2>
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A Property Tag is a type used to name or identify properties that are
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attached to the vertices and edges of a graph. A Property type is not
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the type of the actual property values. Objects of the Property type
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are not used except to carry the type information which specifies the
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property. See the section about <A
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href="using_adjacency_list.html#sec:custom-edge-properties"> Custom
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Edge Properties</a> for a description of how to define your own
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property tags.
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<h3>Associated Types</h3>
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<table border>
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<tr>
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<td>Property Kind </td>
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<td><TT>property_kind<PropertyTag>::type</TT> </td>
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<td>
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This specifies whether the property is a <a
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name="VertexPropertyTag"><b>Vertex Property Tag</b></a>
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(<tt>vertex_property_tag</tt>), an <a
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name="EdgePropertyTag"><b>Edge Property Tag</b></a> (<tt>edge_property_tag</tt>), or
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a <a name="GraphPropertyTag"><b>Graph Property Tag</b></a> which is attached to the
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graph object itself (<tt>graph_property_tag</tt>). The tags are
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defined in <a
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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>.
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</td>
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</tr>
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<tr>
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<td>Property ID Number </td>
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<td><TT>property_num<PropertyTag>::value</TT> </td>
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<td>
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This is needed as a workaround when using compilers that do not
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support partial specialization (and hence prevent us from using
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<tt>boost::is_same</tt> to detect if two property tags are the same).
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The <tt>property_num</tt> traits class is defined in <a
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href="../../../boost/pending/property.hpp"><tt>boost/pending/property.hpp</tt></a>.
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</td>
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</tr>
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</table>
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<h3>Refinement of</h3>
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<a
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href="http://www.boost.org/sgi/stl/DefaultConstructible.html">Default Constructible</a>
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<h3>Models</h3>
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The following models of the Property Tag concept are defined
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in <a
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href="../../../boost/graph/properties.hpp"><tt>boost/graph/properties.hpp</tt></a>.
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<ul>
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<li><tt>vertex_index_t</tt></li>
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<li><tt>edge_index_t</tt></li>
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<li><tt>graph_name_t</tt></li>
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<li><tt>vertex_name_t</tt></li>
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<li><tt>edge_name_t</tt></li>
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<li><tt>edge_weight_t</tt></li>
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<li><tt>vertex_distance_t</tt></li>
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<li><tt>vertex_color_t</tt></li>
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<li><tt>vertex_degree_t</tt></li>
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<li><tt>vertex_out_degree_t</tt></li>
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<li><tt>vertex_in_degree_t</tt></li>
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<li><tt>vertex_discover_time_t</tt></li>
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<li><tt>vertex_finish_time_t</tt></li>
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</ul>
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<h3>See Also</h3>
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<a href="./PropertyGraph.html">PropertyGraph</a>
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and
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<a href="../../property_map/doc/property_map.html">Property Map Concepts</a>
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<h3>Notes</h3>
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On compilers that do not support partial specialization, each Property
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type is also required to specialize
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<tt>property_num<PropertyTag></tt> to contain an enum named
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<tt>value</tt> which uniquely identifies the property type.
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<br>
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<HR>
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<TABLE>
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<TR valign=top>
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<TD nowrap>Copyright © 2000-2001</TD><TD>
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<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>)
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</TD></TR></TABLE>
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</BODY>
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</HTML>
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