REFERENCE
#define OFFSET(P) (REFERENCE((P), indx_t, I_HF_OFFSET))
REFERENCE(P, indx_t, PAGE_OVERHEAD + N * PAIR_OVERHEAD + sizeof(indx_t))
REFERENCE(P, indx_t, PAGE_OVERHEAD + N * PAIR_OVERHEAD)
#define NUM_ENT(P) (REFERENCE((P), indx_t, I_ENTRIES))
#define PREV_PGNO(P) (REFERENCE((P), db_pgno_t, I_PREV_PGNO))
#define NEXT_PGNO(P) (REFERENCE((P), db_pgno_t, I_NEXT_PGNO))
#define TYPE(P) (REFERENCE((P), u_int8_t, I_TYPE))