Re: [Boost-users] How to convert graphtraits<Graph>::in_edge to graphtraits<Graph>::edge

Subject: Re: [Boost-users] How to convert graphtraits<Graph>::in_edge to graphtraits<Graph>::edge
From: Phani Deepak (phanidee_at_[hidden])
Date: 2009-03-25 02:31:47

hi Andrew,

On Wed, Mar 25, 2009 at 6:53 AM, Andrew Sutton <andrew.n.sutton_at_[hidden]>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 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_at_[hidden]
>
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