On Wed, Mar 25, 2009 at 12:01 PM, Phani Deepak <phanidee@gmail.com> wrote:
hi Andrew,

On Wed, Mar 25, 2009 at 6:53 AM, Andrew Sutton <andrew.n.sutton@gmail.com> wrote:


my Graph is :
typedef boost::adjacency_list<boost::listS,boost::listS,boost::bidirectionalS, EdgeProperties *> Graph;

Your graph doesn't seem to have edge properties. The EdgeProprties* type appears to be substituted for the VertexProperties parameter, not EdgeProperties.

Sorry for the typo,
The actual declaration was 

typedef boost::adjacency_list<boost::listS,boost::listS,boost::bidirectionalS, NodeProperties*, EdgeProperties *> Graph;

class NodeProperties {} instead of class Node

class Node{
  public:
  string id;

};
class EdgeProperties {
    public:
    int targetI;// Terminal No. interms of target node
    int sourceI;// Terminal No. interms of source node
    EdgeProperties(int s,int t):sourceI(s-1),targetI(t-1) { }
};

Graph g;
typedef graphtraits<Graph>::vertex_descriptor Vertex;

for(boost::tie(iedge_s,iedge_
end) = boost::in_edges(v,g); iedge_s!=iedge_end; ++iedge_s)
{
    Vertex src =  boost::source(*iedge_s,g);  
    Vertex target =  boost::target(*iedge_s,g);
   cout << g[src]->id << "-->" << g[target]->id << endl;
    EdgeProperties *ep = g[*iedge_s];     //  <==== Line 10;  g[*iedge_s] is returning null

    cout << ep->sourceI << endl;         //        <====   This is giving segmentation fault;
}

**here g[*iedge_s] is returning null**
is it the problem because iam using (*iedge_s) as (edge_descriptor) or
the problem somewhere in my code where in i had not properly assigned the property object
to that specific edge.

i just wanted to know whether both of these are same
graphtraits<Graph>::in_edge_iterator *iedge_iter;
graphtraits<Graph>::edge_iterator *edge_iter;
(*edge_iter) -> this becomes edge_descriptor
(*iedge_iter) -> **whether this will also become edge_descriptor**   

pardon me if iam really missing any basic concept in here.


 
Andrew Sutton
andrew.n.sutton@gmail.com

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