Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

PropertyTag

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 Custom Edge Properties for a description of how to define your own property tags.

Associated Types

Property Kind	`property_kind<PropertyTag>::type`	This specifies whether the property is a Vertex Property Tag (`vertex_property_tag`), an Edge Property Tag (`edge_property_tag`), or a Graph Property Tag which is attached to the graph object itself (`graph_property_tag`). The tags are defined in `boost/graph/properties.hpp`. The `property_kind` traits class is defined in `boost/pending/property.hpp`.
Property ID Number	`property_num<PropertyTag>::value`	This is needed as a workaround when using compilers that do not support partial specialization (and hence prevent us from using `boost::is_same` to detect if two property tags are the same). The `property_num` traits class is defined in `boost/pending/property.hpp`.

Refinement of

Default Constructible

Models

The following models of the Property Tag concept are defined in boost/graph/properties.hpp.

vertex_index_t
edge_index_t
graph_name_t
vertex_name_t
edge_name_t
edge_weight_t
vertex_distance_t
vertex_color_t
vertex_degree_t
vertex_out_degree_t
vertex_in_degree_t
vertex_discover_time_t
vertex_finish_time_t

Notes

On compilers that do not support partial specialization, each Property type is also required to specialize property_num<PropertyTag> to contain an enum named value which uniquely identifies the property type.