1540     int (*create_vi) (struct virtual_node * vn, struct virtual_item * vi, 
1542     int (*check_left) (struct virtual_item * vi, int free, 
1544     int (*check_right) (struct virtual_item * vi, int free);
1545     int (*part_size) (struct virtual_item * vi, int from, int to);
1546     int (*unit_num) (struct virtual_item * vi);
1547     void (*print_vi) (struct virtual_item * vi);
1559 #define op_create_vi(vn,vi,is_affected,insert_size)  item_ops[le_ih_k_type ((vi)->vi_ih)]->create_v…  argument
1560 #define op_check_left(vi,free,start_skip,end_skip) item_ops[(vi)->vi_index]->check_left (vi, free, …  argument
1561 #define op_check_right(vi,free)                      item_ops[(vi)->vi_index]->check_right (vi, fre…  argument
1562 #define op_part_size(vi,from,to)                     item_ops[(vi)->vi_index]->part_size (vi, from,…  argument
1563 #define op_unit_num(vi)				     item_ops[(vi)->vi_index]->unit_num (vi)  argument
1564 #define op_print_vi(vi)                              item_ops[(vi)->vi_index]->print_vi (vi)  argument