-Cart::Cart(MPI_Comm comm_old, int ndims, int dims[], int periods[], int reorder, MPI_Comm *comm_cart) : Cart(ndims) {
+Topo_Cart::Topo_Cart(MPI_Comm comm_old, int ndims, int dims[], int periods[], int reorder, MPI_Comm *comm_cart) : Topo_Cart(ndims) {