Re: [Boost-users] Error in accessing label of an edge, urgently need help.

Subject: Re: [Boost-users] Error in accessing label of an edge, urgently need help.
From: Jeremiah Willcock (jewillco_at_[hidden])
Date: 2011-12-14 11:35:27

On Wed, 14 Dec 2011, Amanullah Yasin wrote:

> Hello,
> 
> I want to put edge label but facing an error. Please share any better idea.
> Thanks in advance.

BTW, you shouldn't add things to the boost namespace; property names don't 
need to be in that namespace.  Anyway, the code worked for me with GCC 
4.6.  Here's the full test program I used:

#include <boost/graph/properties.hpp>
#include <boost/graph/adjacency_list.hpp>
#include <string>
#include <iostream>

struct plComputableObject;
struct slScoreValueType {};
namespace boost {
   struct computable_object_t
   {
     typedef vertex_property_tag kind;
   };
}

typedef boost::property<boost::vertex_index_t, unsigned int,
         boost::property<boost::computable_object_t,
         plComputableObject*> > slVertexProperty;

typedef boost::property<boost::edge_weight_t, slScoreValueType,
         boost::property<boost::edge_name_t, std::string> > slEdgeProperty;

typedef boost::adjacency_list<boost::vecS, boost::listS, 
boost::bidirectionalS,
         slVertexProperty, slEdgeProperty> slGraph;

int main(int, char**) {
   using namespace boost;
   slGraph graph;

   //Now i want to add edge name
   boost::property_map<slGraph, edge_name_t>::type labelmap = 
get(edge_name, graph);

   boost::graph_traits<slGraph>::edge_iterator ei, ei_end;
   for(tie(ei, ei_end) = edges(graph); ei != ei_end; ++ei){

     std::string label = "unknown";
     put(labelmap, *ei, label);
     std::cout<<"\nUndirected s: "<<source(*ei, graph) <<" T: 
"<<target(*ei, graph)<<" LABEL: "<< get(labelmap,*ei);
   }
}

-- Jeremiah Willcock