vieter-v/libvieter
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fix(tree): fix wrong rotation function

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This commit is contained in:
Jef Roosens 2023-02-01 22:12:34 +01:00
parent 17c2e15385
commit 70217bee21
Signed by: Jef Roosens
GPG key ID: B75D4F293C7052DB
4 changed files with 71 additions and 2 deletions
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14
src/tree/vieter_tree_balancing.c
View file

@ -21,8 +21,12 @@ bool vieter_tree_node_validate(vieter_tree_node *node,
vieter_tree_node_get(node->children[0], vieter_tree_node_black)) &&
(node->children[1] == NULL ||
vieter_tree_node_get(node->children[1], vieter_tree_node_black)));
bool right_child_flag_set =
node->parent == NULL ||
(vieter_tree_node_get(node, vieter_tree_node_right) ==
(node->parent->children[1] == node));
return correctly_colored_children &&
return correctly_colored_children && right_child_flag_set &&
vieter_tree_node_validate(node->children[0], passed_black_nodes,
expected_black_nodes) &&
vieter_tree_node_validate(node->children[1], passed_black_nodes,
@ -128,6 +132,14 @@ vieter_tree_node *vieter_tree_node_rotate(vieter_tree_node *old_root,
bool dir) {
vieter_tree_node *new_root = old_root->children[1 - dir];
if (old_root->parent != NULL) {
vieter_tree_node_set_child(
old_root->parent, new_root,
vieter_tree_node_get(old_root, vieter_tree_node_right));
} else {
new_root->parent = NULL;
}
// Right rotation
if (dir) {
vieter_tree_node_set_child(old_root, new_root->children[1], false);

1
src/tree/vieter_tree_balancing.h
View file

@ -17,4 +17,5 @@ void vieter_tree_node_balance_after_insert(vieter_tree_node *node);
*/
void vieter_tree_node_remove_balanced(vieter_tree_node *node);
vieter_tree_node *vieter_tree_node_rotate(vieter_tree_node *old_root, bool dir);
#endif