template <class EXT_ID, class INT_ID, class COMPARE_KEYS, class ACE_LOCK> ACE_RB_Tree_Node<EXT_ID, INT_ID> *
ACE_RB_Tree<EXT_ID, INT_ID, COMPARE_KEYS, ACE_LOCK>::find_node (const EXT_ID &k, ACE_RB_Tree_Base::RB_SearchResult &result)
{
ACE_TRACE ("ACE_RB_Tree<EXT_ID, INT_ID, COMPARE_KEYS, ACE_LOCK>::find_node");
// Start at the root.
ACE_RB_Tree_Node<EXT_ID, INT_ID> *current = root_;
while (current)
{
// While there are more nodes to examine.
if (this->lessthan (current->key (), k))
{
// If the search key is greater than the current node's key.
if (current->right ())
// If the right subtree is not empty, search to the right.
current = current->right ();
else
{
// If the right subtree is empty, we're done searching,
// and are positioned to the left of the insertion point.
result = LEFT;
break;
}
}
else if (this->lessthan (k, current->key ()))
{
// Else if the search key is less than the current node's key.
if (current->left ())
// If the left subtree is not empty, search to the left.
current = current->left ();
else
{
// If the left subtree is empty, we're done searching,
// and are positioned to the right of the insertion point.
result = RIGHT;
break;
}
}
else
{
// If the keys match exactly, we're done as well.
result = EXACT;
break;
}
}
return current;
}
template <class EXT_ID, class INT_ID, class COMPARE_KEYS, class ACE_LOCK> int
ACE_RB_Tree<EXT_ID, INT_ID, COMPARE_KEYS, ACE_LOCK>::remove_i (ACE_RB_Tree_Node<EXT_ID, INT_ID> *z)
{
ACE_TRACE ("ACE_RB_Tree<EXT_ID, INT_ID, COMPARE_KEYS, ACE_LOCK>::remove_i (ACE_RB_Tree_Node<EXT_ID, INT_ID> *z)");
// Delete the node and reorganize the tree to satisfy the Red-Black
// properties.
ACE_RB_Tree_Node<EXT_ID, INT_ID> *x;
ACE_RB_Tree_Node<EXT_ID, INT_ID> *y;
ACE_RB_Tree_Node<EXT_ID, INT_ID> *parent;
if (z->left () && z->right ())
y = RB_tree_successor (z);
else
y = z;
if (!y)
return -1;
if (y->left ())
x = y->left ();
else
x = y->right ();
parent = y->parent ();
if (x)
{
x->parent (parent);
}
if (parent)
{
if (y == parent->left ())
parent->left (x);
else
parent->right (x);
}
else
this->root_ = x;
if (y != z)
{
// Copy the elements of y into z.
z->key () = y->key ();
z->item () = y->item ();
}
// CLR pp. 263 says that nil nodes are implicitly colored BLACK
if (!y || y->color () == ACE_RB_Tree_Node_Base::BLACK)
RB_delete_fixup (x, parent);
y->parent (0);
y->right (0);
y->left (0);
ACE_DES_FREE_TEMPLATE2 (y,
this->allocator_->free,
ACE_RB_Tree_Node,
EXT_ID, INT_ID);
--this->current_size_;
return 0;
}