How to copy a graph using boost c++?

Question

I have a problem copying a graph using boost? My code is given below: It doesn't let me to create IndexMap as a type.

template <class Graph>
int abc(Graph& G){

    typename graph_traits<Graph>::vertex_descriptor NodeID;

    typedef map<size_t, NodeID> IndexMap; //It doesn't let me to create NodeID type

    typedef map<NodeID, size_t> IndexMap;

    IndexMap mapIndex;

    associative_property_map<IndexMap> propmapIndex(mapIndex);

    Graph g1, g2;

    int i=0;
    BGL_FORALL_VERTICES(v, g2, Graph)
    {
       put(propmapIndex, v, i++);
    }

    g1.clear();
    copy_graph( g2, g1, vertex_index_map( propmapIndex ) );
    g2.clear();

}

int main(){

    typedef adjacency_list<listS, vecS, undirectedS, 
        WeightProperty, property<edge_color_t, default_color_type>  MyGraphType;
    typename graph_traits<MyGraphType>::adjacency_iterator ai, ai_end;

    typename graph_traits<MyGraphType>::vertex_descriptor Vertex;
    ...
    ...

    MyGraphType G;
    ... //addition of vertices and edges
    abc(G);

}

Thank you for the help.

Answer 1

I guess

typename graph_traits<Graph>::vertex_descriptor NodeID;

should be

typedef typename graph_traits<Graph>::vertex_descriptor NodeID;

The upper variant is a declaration of a variable NodeID of type graph_traits<Graph>::vertex_descriptor, while the latter is a typedef for the same type.