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AK: Add begin_from(V&) APIs to IntrusiveRedBlackTree

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This method exploits the fact that the values themselves hold the tree
pointers, and as a result this let's us skip the O(logn) traversal down
to the matching Node for a Key-Value pair.
This commit is contained in:
Idan Horowitz 2022-04-04 00:19:31 +03:00 committed by Andreas Kling
parent 30e6b313b4
commit 1787d94907
Notes: sideshowbarker 2024-07-17 14:29:52 +09:00 
Author: https://github.com/IdanHo
Commit: https://github.com/SerenityOS/serenity/commit/1787d94907
Pull-request: https://github.com/SerenityOS/serenity/pull/13490
1 changed files with 2 additions and 0 deletions
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AK/IntrusiveRedBlackTree.h
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@ -117,11 +117,13 @@ public:
Iterator begin() { return Iterator(static_cast<TreeNode*>(this->m_minimum)); }
Iterator end() { return {}; }
Iterator begin_from(K key) { return Iterator(static_cast<TreeNode*>(BaseTree::find(this->m_root, key))); }
Iterator begin_from(V& value) { return Iterator(&(value.*member)); }
using ConstIterator = BaseIterator<const V>;
ConstIterator begin() const { return ConstIterator(static_cast<TreeNode*>(this->m_minimum)); }
ConstIterator end() const { return {}; }
ConstIterator begin_from(K key) const { return ConstIterator(static_cast<TreeNode*>(BaseTree::find(this->m_rootF, key))); }
ConstIterator begin_from(V const& value) const { return Iterator(&(value.*member)); }
bool remove(K key)
{