static int keyval_create(MPI_Type_copy_attr_function* copy_fn, MPI_Type_delete_attr_function* delete_fn, int* keyval, void* extra_state);
static int keyval_free(int* keyval);
int pack(void* inbuf, int incount, void* outbuf, int outcount, int* position, MPI_Comm comm);
static int keyval_create(MPI_Type_copy_attr_function* copy_fn, MPI_Type_delete_attr_function* delete_fn, int* keyval, void* extra_state);
static int keyval_free(int* keyval);
int pack(void* inbuf, int incount, void* outbuf, int outcount, int* position, MPI_Comm comm);