// We set the iteration field of all vertex with incoming edges to
// the current iteration value
for(int f = 0; f < front_size; f++) {
v = _front[f];
for(e = v->leaving_edges; e; e = e->next_leaving_edge) {
// We set the iteration field of all vertex with incoming edges to
// the current iteration value
for(int f = 0; f < front_size; f++) {
v = _front[f];
for(e = v->leaving_edges; e; e = e->next_leaving_edge) {