[Lemon-user] vector of pointers to FilterNodes

[Cherif Mouaouia Bouzid]

Salam Aleykoum (Peace be upon u)

This is a simple version of what I would like to do:

Assume a complete graph g with three nodes labelled 'a', 'b' and 'c' (a
triangle).
I would like to construct a vector of pointers to FilterNodes on g.
The problem is that when I want to disable a node on one FilterNodes, the
node is disabled on every FilterNodes.

Here is the code:

    ListGraph::NodeMap<bool> filter(g, true);
    vector< FilterNodes<ListGraph> * > vClusters; // A vector of adresses to
FilterNodes on g
    for(unsigned int i=0; i<3; i++)
       vClusters.push_back(new FilterNodes<ListGraph> (g,filter) ); //
Constructing dynamically new FilterNodes (note that every node is taken
initially)

    cout << "Before : " << endl; //State of the FilterNodes before disabling
a node
    for(unsigned int i=0; i<3; i++)
       {
         cout << "  FilterNodes " << i << " : " << endl;
         for (FilterNodes<ListGraph>::EdgeIt e(*vClusters[i]); e != INVALID;
++e)
         cout << "   ( " << label[g.u(e)] <<", "<< label[g.v(e)]<<" )"<<
endl;
       }

    ListGraph::NodeIt v(g); //Let's take the first node in g. In my case, it
is the node 'c'
    vClusters[0]->disable(v); // The node 'c' should be disabled only in the
first FilterNodes

    cout << "After : " << endl; //State of the FilterNodes after disabling
the node 'c'
    for(unsigned int i=0; i<3; i++)
       {
         cout << "  FilterNodes " << i << " : " << endl;
         for (FilterNodes<ListGraph>::EdgeIt e(*vClusters[i]); e != INVALID;
++e)
         cout << "  ( " << label[g.u(e)] <<", "<< label[g.v(e)]<<" )"<<
endl;
       }

    for(unsigned int i=0; i<L.size(); i++) // FilterNodes are deleted
      delete vClusters[i];

OUTPUT:
Before :
  FilterNodes 0 :
   ( b, c )
   ( a, c )
   ( a, b )
  FilterNodes 1 :
   ( b, c )
   ( a, c )
   ( a, b )
  FilterNodes 2 :
   ( b, c )
   ( a, c )
   ( a, b )
After :
  FilterNodes 0 :
  ( a, b )
  FilterNodes 1 :
  ( a, b )
  FilterNodes 2 :
  ( a, b )

Question:
Why is Node 'c' disabled in every FilterNodes ?

Thanks and Regards

Cherif, Algeria
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