Re: [Boost-users] How do i access graph property?

From: Douglas Gregor (doug.gregor_at_[hidden])
Date: 2006-01-31 08:55:43

On Jan 31, 2006, at 6:37 AM, Jef Driesen wrote:

> Suppose I have defined the following graph:
>
> typedef boost::adjacency_list<
>     boost::setS,      // Adjacency list
>     boost::setS,      // Vertex list
>     boost::undirectedS,   // Undirected graph
>     unsigned int,      // Vertex property (unique label)
>     boost::no_property,   // Edge property
>     unsigned int,      // Graph property (next unique label)
>     boost::listS      // Edge list
>> graph;
>
> But I can't find a way to access property associated with my graph.  
> How
> can I do this?

This is an omission (bug) in the BGL. If you change your graph type  
to this:

typedef boost::adjacency_list<
     boost::setS,      // Adjacency list
     boost::setS,      // Vertex list
     boost::undirectedS,   // Undirected graph
     unsigned int,      // Vertex property (unique label)
     boost::no_property,   // Edge property
     boost::property<boost::graph_name_t, unsigned int>,      //  
Graph property (next unique label)
     boost::listS      // Edge list
   > graph;

You can get at the graph property with:

   get_property(graph_instance, boost::graph_name())

We'll find a better way to handle this in the next Boost release.

        Doug