//this is just an part of my code
ListDigraph* function1(trajectoire    trajectoire1);
{
ListDigraph * g;
ListDigraph::Node node1 = g->addNode(); // Here i create a node
ListDigraph::NodeMap<int>    label1(*g);
label1[node1] =  j;// Here i put an integer in the label of node1

}

void function2(ListDigraph  *g);
 {

 // Here i can't use label1 i can't write std::cout << label1[node1];

 }