int get(int maxdims, int* dims, int* periods, int* coords);
int rank(const int* coords, int* rank);
int shift(int direction, int disp, int* rank_source, int* rank_dest);
int get(int maxdims, int* dims, int* periods, int* coords);
int rank(const int* coords, int* rank);
int shift(int direction, int disp, int* rank_source, int* rank_dest);