[Boost-users] Re: write_graphviz: write out edges when vertex data is a boost::shared_ptr?

From: Jeffrey Holle (jeff.holle_at_[hidden])
Date: 2004-11-08 15:17:28

I believe you need to use boost::make_label_writer.
Here is how I use it to place information from an external property map:

ofstream os("workFlow.dot");
write_graphviz(os,workFlowGraph_,make_label_writer(workFlowVertexLabeler(workFlowGraph_)));

Where workFlowVertexLabeler is:

struct workFlowVertexLabeler
{
   workFlowVertexLabeler(WorkFlowGraph& workFlowGraph) : 
workFlowGraph_(workFlowGraph) {}
   std::string operator[](const WorkFlowVertex& v) const
   {
     return workFlowGraph_.getWorkFlowData()[v].getLabel();
   }
private:
   WorkFlowGraph& workFlowGraph_;

Stephen torri wrote:
> How does one write out the proper edge node names when the vertex data
> is a boost::shared_ptr? My graph is defined as:
> 
>   typedef property< vertex_index_t, uint32_t,
>      property< vertex_name_t, boost::shared_ptr<Component> > >
>   VertexProperty;
> 
>   typedef adjacency_list<setS, // OutEdgeList
>                          setS, // VertexList
>                          directedS, // Directed
>                          VertexProperty> // VertexProperties
>   Graph_Type;
> 
> The call in graphviz.hpp at line 269 has me confused. I understand that
> the node ids are printed out by looking for the value stored in the
> vertex_index_t property, graphviz.hpp at line 263. So if the value
> stored at the vertex_index_t property was the value '3' the node's name
> would be '3'. The edges are what have me confused. I would expect that
> the source id and the target it would be the value  of the
> vertex_index_t property. So if there are two nodes the dot file would
> be:
> 
> 0[label="A"];
> 1[label="B"];
> 0 -> 1;
> 
> Yet with a boost::shared_ptr stored in a vertex_name_t property I get:
> 
> 0[label="A"];
> 1[label="B"];
> 0x807a108->0x807a128;
> 
> Well anything starting with a '0x' is ambigiuos to the dot parser. It
> breaks the 0x807a108 into two names. 
> 
> I need to use a boost::shared_ptr for my data. I believe I have not used
> the right boost::property type. Is that right?
> 
> What I expect to see as output for the dot file is:
> 
> 0[label="A"];
> 1[label="B"];
> 0->1;
> 
> Stephen