4.9.3.10 Replacing the Current Item

75. <BST traverser replacement function 75> =
void *
bst_t_replace (struct bst_traverser *trav, void *new) 
{
  void *old;

  assert (trav != NULL && trav->bst_node != NULL && new != NULL);
  old = trav->bst_node->bst_data;
  trav->bst_node->bst_data = new;
  return old;
}

This code is included in 63, 178, 268, 395, 502, and 546.