anode->btree.n_used_nodes = btree->n_used_nodes;
anode->btree.first_free = btree->first_free;
anode->btree.n_free_nodes = 40 - anode->btree.n_used_nodes;
memcpy(&anode->u, &btree->u, btree->n_used_nodes * 12);
anode->btree.n_used_nodes = btree->n_used_nodes;
anode->btree.first_free = btree->first_free;
anode->btree.n_free_nodes = 40 - anode->btree.n_used_nodes;
memcpy(&anode->u, &btree->u, btree->n_used_nodes * 12);