double clustering_coeff(v_index v) { return clustering_coefficient(*graph, (*vertices)[v]); }
double clustering_coeff(v_index v) { return clustering_coefficient(graph, vertices[v]); }
double clustering_coeff(v_index v) { return clustering_coefficient(*graph, (*vertices)[v]); }
double clustering_coeff(v_index v) { return clustering_coefficient(graph, vertices[v]); }