mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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998 lines
41 KiB
C++
998 lines
41 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <vapours/common.hpp>
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#include <vapours/assert.hpp>
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#include <vapours/util/impl/util_available_index_finder.hpp>
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#include <vapours/util/util_alignment.hpp>
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namespace ams::util {
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template<typename Member, typename Compare, typename IteratorMember, size_t BufferAlignment = 8> requires std::convertible_to<Member &, IteratorMember &>
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class FixedTree {
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private:
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class IteratorBase;
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friend class IteratorBase;
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private:
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enum class Color : u8 {
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Red = 0,
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Black = 1,
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};
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static constexpr inline int Index_Nil = -1;
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static constexpr inline int Index_Leaf = -2;
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static constexpr inline int Index_BeforeBegin = -3;
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static constexpr inline int Index_AfterEnd = -4;
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static constexpr inline size_t max_size = 0x40000000;
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struct Header {
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/* "Nintendo Red-Black tree" */
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static constexpr u32 Signature = util::ReverseFourCC<'N','N','R','B'>::Code;
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u32 header_size;
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u32 header_signature;
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u32 _08;
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s32 max_elements;
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s32 cur_elements;
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s32 root_index;
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s32 left_most_index;
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s32 right_most_index;
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s32 index_signature;
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u32 buffer_size;
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u32 node_size;
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u32 element_size;
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u32 _30;
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u32 _34;
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u32 _38;
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u32 _3C;
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u32 _40;
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u32 _44;
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u32 _48;
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u32 _4C;
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void InitializeHeader(u32 _08, s32 max_e, s32 cur_e, u32 ind_sig, u32 buf_sz, u32 node_sz, u32 e_sz, u32 _30, u32 _34, u32 _38, u32 _3C, u32 _40, u32 _44) {
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this->header_size = sizeof(Header);
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this->header_signature = Signature;
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this->_08 = _08;
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this->max_elements = max_e;
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this->cur_elements = cur_e;
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this->root_index = Index_Nil;
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this->left_most_index = Index_Nil;
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this->right_most_index = Index_Nil;
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this->index_signature = ind_sig;
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this->buffer_size = buf_sz;
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this->node_size = node_sz;
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this->element_size = e_sz;
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this->_30 = _30;
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this->_34 = _34;
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this->_38 = _38;
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this->_3C = _3C;
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this->_40 = _40;
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this->_44 = _44;
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this->_48 = 0;
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this->_4C = 0;
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}
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};
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static_assert(sizeof(Header) == 0x50);
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struct IndexPair {
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int first;
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int last;
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};
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struct Node {
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Member m_data;
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int m_parent;
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int m_right;
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int m_left;
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Color m_color;
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void SetLeft(int l, Node *n, int p) {
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m_left = l;
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n->m_parent = p;
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}
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void SetRight(int r, Node *n, int p) {
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m_right = r;
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n->m_parent = p;
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}
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};
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class Iterator;
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class ConstIterator;
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class IteratorBase {
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private:
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friend class ConstIterator;
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private:
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const FixedTree *m_tree;
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int m_index;
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protected:
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constexpr ALWAYS_INLINE IteratorBase(const FixedTree *tree, int index) : m_tree(tree), m_index(index) { /* ... */ }
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constexpr bool IsEqualImpl(const IteratorBase &rhs) const {
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/* Validate pre-conditions. */
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AMS_ASSERT(m_tree);
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/* Check for tree equality. */
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if (m_tree != rhs.m_tree) {
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return false;
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}
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/* Check for nil. */
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if (m_tree->IsNil(m_index) && m_tree->IsNil(rhs.m_index)) {
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return true;
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}
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/* Check for index equality. */
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return m_index == rhs.m_index;
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}
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constexpr IteratorMember &DereferenceImpl() const {
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/* Validate pre-conditions. */
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AMS_ASSERT(m_tree);
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if (!m_tree->IsNil(m_index)) {
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return m_tree->m_nodes[m_index].m_data;
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} else {
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AMS_ASSERT(false);
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return m_tree->GetNode(std::numeric_limits<int>::max())->m_data;
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}
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}
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constexpr ALWAYS_INLINE IteratorBase &IncrementImpl() {
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/* Validate pre-conditions. */
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AMS_ASSERT(m_tree);
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this->OperateIndex(true);
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return *this;
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}
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constexpr ALWAYS_INLINE IteratorBase &DecrementImpl() {
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/* Validate pre-conditions. */
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AMS_ASSERT(m_tree);
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this->OperateIndex(false);
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return *this;
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}
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constexpr void OperateIndex(bool increment) {
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if (increment) {
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/* We're incrementing. */
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if (m_index == Index_BeforeBegin) {
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m_index = 0;
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} else {
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m_index = m_tree->UncheckedPP(m_index);
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if (m_tree->IsNil(m_index)) {
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m_index = Index_AfterEnd;
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}
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}
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} else {
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/* We're decrementing. */
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if (m_index == Index_AfterEnd) {
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m_index = static_cast<int>(m_tree->size()) - 1;
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} else {
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m_index = m_tree->UncheckedMM(m_index);
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if (m_tree->IsNil(m_index)) {
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m_index = Index_BeforeBegin;
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}
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}
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}
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}
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};
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class Iterator : public IteratorBase {
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public:
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constexpr ALWAYS_INLINE Iterator(const FixedTree &tree) : IteratorBase(std::addressof(tree), tree.size() ? tree.GetLMost() : Index_Leaf) { /* ... */ }
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constexpr ALWAYS_INLINE Iterator(const FixedTree &tree, int index) : IteratorBase(std::addressof(tree), index) { /* ... */ }
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constexpr ALWAYS_INLINE Iterator(const Iterator &rhs) = default;
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constexpr ALWAYS_INLINE bool operator==(const Iterator &rhs) const {
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return this->IsEqualImpl(rhs);
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}
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constexpr ALWAYS_INLINE bool operator!=(const Iterator &rhs) const {
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return !(*this == rhs);
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}
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constexpr ALWAYS_INLINE IteratorMember &operator*() const {
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return static_cast<IteratorMember &>(this->DereferenceImpl());
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}
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constexpr ALWAYS_INLINE IteratorMember *operator->() const {
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return std::addressof(this->operator *());
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}
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constexpr ALWAYS_INLINE Iterator &operator++() {
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return static_cast<Iterator &>(this->IncrementImpl());
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}
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constexpr ALWAYS_INLINE Iterator &operator--() {
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return static_cast<Iterator &>(this->DecrementImpl());
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}
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};
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class ConstIterator : public IteratorBase {
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public:
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constexpr ALWAYS_INLINE ConstIterator(const FixedTree &tree) : IteratorBase(std::addressof(tree), tree.size() ? tree.GetLMost() : Index_Leaf) { /* ... */ }
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constexpr ALWAYS_INLINE ConstIterator(const FixedTree &tree, int index) : IteratorBase(std::addressof(tree), index) { /* ... */ }
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constexpr ALWAYS_INLINE ConstIterator(const ConstIterator &rhs) = default;
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constexpr ALWAYS_INLINE ConstIterator(const Iterator &rhs) : IteratorBase(rhs.m_tree, rhs.m_index) { /* ... */ }
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constexpr ALWAYS_INLINE bool operator==(const ConstIterator &rhs) const {
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return this->IsEqualImpl(rhs);
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}
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constexpr ALWAYS_INLINE bool operator!=(const ConstIterator &rhs) const {
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return !(*this == rhs);
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}
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constexpr ALWAYS_INLINE const IteratorMember &operator*() const {
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return static_cast<const IteratorMember &>(this->DereferenceImpl());
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}
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constexpr ALWAYS_INLINE const IteratorMember *operator->() const {
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return std::addressof(this->operator *());
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}
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constexpr ALWAYS_INLINE ConstIterator &operator++() {
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return static_cast<ConstIterator &>(this->IncrementImpl());
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}
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constexpr ALWAYS_INLINE ConstIterator &operator--() {
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return static_cast<ConstIterator &>(this->DecrementImpl());
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}
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};
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public:
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using iterator = Iterator;
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using const_iterator = ConstIterator;
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private:
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impl::AvailableIndexFinder m_index_finder;
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Node m_dummy_leaf;
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Node *m_p_dummy_leaf;
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u8 *m_buffer;
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Header *m_header;
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Node *m_nodes;
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iterator m_end_iterator;
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public:
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FixedTree() : m_end_iterator(*this, Index_Nil) {
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this->SetDummyMemory();
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}
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protected:
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void InitializeImpl(int num_elements, void *buffer, size_t buffer_size) {
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/* Check pre-conditions. */
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AMS_ASSERT(num_elements > 0);
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AMS_ASSERT(static_cast<size_t>(num_elements) <= max_size);
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AMS_ASSERT(util::IsAligned(reinterpret_cast<uintptr_t>(buffer), BufferAlignment));
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AMS_ASSERT(buffer_size == GetRequiredMemorySize(num_elements));
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/* Set buffer. */
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m_buffer = static_cast<u8 *>(buffer);
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m_header = reinterpret_cast<Header *>(m_buffer);
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/* Setup memory. */
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this->InitializeMemory(num_elements, buffer_size, impl::AvailableIndexFinder::GetSignature());
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/* Check that buffer was set up correctly. */
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AMS_ASSERT(static_cast<u32>(buffer_size) == m_header->buffer_size);
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/* Setup dummy leaf. */
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this->SetDummyMemory();
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}
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public:
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static constexpr size_t SizeOfNodes(size_t num_elements) {
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return util::AlignUp(sizeof(Node) * num_elements, BufferAlignment);
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}
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static constexpr size_t SizeOfIndex(size_t num_elements) {
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return impl::AvailableIndexFinder::GetRequiredMemorySize(num_elements);
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}
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static constexpr size_t GetRequiredMemorySize(size_t num_elements) {
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return sizeof(Header) + SizeOfNodes(num_elements) + SizeOfIndex(num_elements);
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}
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private:
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void SetDummyMemory() {
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m_dummy_leaf.m_color = Color::Black;
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m_dummy_leaf.m_parent = Index_Nil;
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m_dummy_leaf.m_left = Index_Leaf;
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m_dummy_leaf.m_right = Index_Leaf;
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m_p_dummy_leaf = std::addressof(m_dummy_leaf);
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}
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void InitializeMemory(int num_elements, u32 buffer_size, u32 signature) {
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/* Initialize the header. */
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m_header->InitializeHeader(1, num_elements, 0, signature, buffer_size, sizeof(Node), sizeof(Member), 4, 4, 4, 4, 4, BufferAlignment);
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/* Setup index finder. */
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m_index_finder.Initialize(std::addressof(m_header->cur_elements), std::addressof(m_header->max_elements), m_buffer + sizeof(*m_header) + SizeOfNodes(num_elements));
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/* Set nodes array. */
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m_nodes = reinterpret_cast<Node *>(m_buffer + sizeof(*m_header));
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}
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Node *GetNode(int index) const {
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if (index >= 0) {
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return m_nodes + index;
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} else {
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return m_p_dummy_leaf;
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}
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}
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constexpr ALWAYS_INLINE bool IsNil(int index) const {
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return index < 0;
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}
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constexpr ALWAYS_INLINE bool IsLeaf(int index) const {
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return index == Index_Leaf;
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}
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int GetRoot() const { return m_header->root_index; }
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void SetRoot(int index) {
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if (index == Index_Leaf) {
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index = Index_Nil;
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}
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m_header->root_index = index;
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}
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int GetLMost() const { return m_header->left_most_index; }
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void SetLMost(int index) { m_header->left_most_index = index; }
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int GetRMost() const { return m_header->right_most_index; }
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void SetRMost(int index) { m_header->right_most_index = index; }
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int GetParent(int index) const {
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return this->GetNode(index)->m_parent;
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}
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int AcquireIndex() { return m_index_finder.AcquireIndex(); }
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void ReleaseIndex(int index) { return m_index_finder.ReleaseIndex(index); }
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int EraseByIndex(int target_index) {
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/* Setup tracking variables. */
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const auto next_index = this->UncheckedPP(target_index);
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auto *target_node = this->GetNode(target_index);
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auto a_index = Index_Leaf;
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auto *a_node = this->GetNode(a_index);
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auto b_index = Index_Leaf;
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auto *b_node = this->GetNode(b_index);
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auto cur_index = target_index;
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auto *cur_node = this->GetNode(cur_index);
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if (cur_node->m_left == Index_Leaf) {
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a_index = cur_node->m_right;
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a_node = this->GetNode(a_index);
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m_p_dummy_leaf->m_parent = cur_index;
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} else {
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if (cur_node->m_right == Index_Leaf) {
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a_index = cur_node->m_left;
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} else {
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cur_index = next_index;
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cur_node = this->GetNode(cur_index);
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a_index = cur_node->m_right;
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}
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a_node = this->GetNode(a_index);
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m_p_dummy_leaf->m_parent = cur_index;
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}
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/* Ensure the a node is updated (redundant) */
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a_node = this->GetNode(a_index);
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/* Update relevant metrics/links. */
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if (cur_index == target_index) {
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/* No left, but has right. */
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b_index = target_node->m_parent;
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b_node = this->GetNode(b_index);
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if (a_index != Index_Leaf) {
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a_node->m_parent = b_index;
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}
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if (this->GetRoot() == target_index) {
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this->SetRoot(a_index);
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} else if (b_node->m_left == target_index) {
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b_node->m_left = a_index;
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} else {
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b_node->m_right = a_index;
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}
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if (this->GetLMost() == target_index) {
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this->SetLMost((a_index != Index_Leaf) ? this->FindMinInSubtree(a_index) : b_index);
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}
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if (this->GetRMost() == target_index) {
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this->SetRMost((a_index != Index_Leaf) ? this->FindMaxInSubtree(a_index) : b_index);
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}
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} else {
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/* Has left or doesn't have right. */
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/* Fix left links. */
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this->GetNode(target_node->m_left)->m_parent = cur_index;
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cur_node->m_left = target_node->m_left;
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if (cur_index == target_node->m_right) {
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b_index = cur_index;
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b_node = this->GetNode(b_index);
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} else {
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b_index = cur_node->m_parent;
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b_node = this->GetNode(b_index);
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if (!this->IsNil(a_index)) {
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a_node->m_parent = b_index;
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}
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b_node->m_left = a_index;
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cur_node->m_right = target_node->m_right;
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this->GetNode(target_node->m_right)->m_parent = cur_index;
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}
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if (this->GetRoot() == target_index) {
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this->SetRoot(cur_index);
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} else {
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if (this->GetNode(target_node->m_parent)->m_left == target_index) {
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this->GetNode(target_node->m_parent)->m_left = cur_index;
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} else {
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this->GetNode(target_node->m_parent)->m_right = cur_index;
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}
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}
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cur_node->m_parent = target_node->m_parent;
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std::swap(cur_node->m_color, target_node->m_color);
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}
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/* Ensure the tree remains balanced. */
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if (target_node->m_color == Color::Black) {
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while (true) {
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if (a_index == this->GetRoot() || a_node->m_color != Color::Black) {
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break;
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}
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if (a_index == b_node->m_left) {
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cur_index = b_node->m_right;
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cur_node = this->GetNode(cur_index);
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if (cur_node->m_color == Color::Red) {
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cur_node->m_color = Color::Black;
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b_node->m_color = Color::Red;
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AMS_ASSERT(m_p_dummy_leaf->m_color == Color::Black);
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this->RotateLeft(b_index);
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cur_index = b_node->m_right;
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cur_node = this->GetNode(cur_index);
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}
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if (this->IsNil(cur_index)) {
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a_index = b_index;
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a_node = b_node;
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} else {
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if (this->GetNode(cur_node->m_left)->m_color != Color::Black || this->GetNode(cur_node->m_right)->m_color != Color::Black) {
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if (this->GetNode(cur_node->m_right)->m_color == Color::Black) {
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this->GetNode(cur_node->m_left)->m_color = Color::Black;
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cur_node->m_color = Color::Red;
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AMS_ASSERT(m_p_dummy_leaf->m_color == Color::Black);
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this->RotateRight(cur_index);
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cur_index = b_node->m_right;
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cur_node = this->GetNode(cur_index);
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}
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cur_node->m_color = b_node->m_color;
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b_node->m_color = Color::Black;
|
|
|
|
this->GetNode(cur_node->m_right)->m_color = Color::Black;
|
|
|
|
this->RotateLeft(b_index);
|
|
|
|
break;
|
|
}
|
|
|
|
cur_node->m_color = Color::Red;
|
|
AMS_ASSERT(m_p_dummy_leaf->m_color == Color::Black);
|
|
|
|
a_index = b_index;
|
|
a_node = b_node;
|
|
}
|
|
} else {
|
|
cur_index = b_node->m_left;
|
|
cur_node = this->GetNode(cur_index);
|
|
|
|
if (cur_node->m_color == Color::Red) {
|
|
cur_node->m_color = Color::Black;
|
|
b_node->m_color = Color::Red;
|
|
AMS_ASSERT(m_p_dummy_leaf->m_color == Color::Black);
|
|
|
|
this->RotateRight(b_index);
|
|
|
|
cur_index = b_node->m_left;
|
|
cur_node = this->GetNode(cur_index);
|
|
}
|
|
|
|
if (this->IsNil(cur_index)) {
|
|
a_index = b_index;
|
|
a_node = b_node;
|
|
} else {
|
|
if (this->GetNode(cur_node->m_right)->m_color != Color::Black || this->GetNode(cur_node->m_left)->m_color != Color::Black) {
|
|
if (this->GetNode(cur_node->m_left)->m_color == Color::Black) {
|
|
this->GetNode(cur_node->m_right)->m_color = Color::Black;
|
|
cur_node->m_color = Color::Red;
|
|
AMS_ASSERT(m_p_dummy_leaf->m_color == Color::Black);
|
|
|
|
this->RotateLeft(cur_index);
|
|
|
|
cur_index = b_node->m_left;
|
|
cur_node = this->GetNode(cur_index);
|
|
}
|
|
|
|
cur_node->m_color = b_node->m_color;
|
|
b_node->m_color = Color::Black;
|
|
|
|
this->GetNode(cur_node->m_left)->m_color = Color::Black;
|
|
|
|
this->RotateRight(b_index);
|
|
|
|
break;
|
|
}
|
|
|
|
cur_node->m_color = Color::Red;
|
|
AMS_ASSERT(m_p_dummy_leaf->m_color == Color::Black);
|
|
|
|
a_index = b_index;
|
|
a_node = b_node;
|
|
}
|
|
}
|
|
|
|
b_index = a_node->m_parent;
|
|
b_node = this->GetNode(b_index);
|
|
}
|
|
|
|
a_node->m_color = Color::Black;
|
|
}
|
|
|
|
/* Release the index. */
|
|
this->ReleaseIndex(target_index);
|
|
return target_index;
|
|
}
|
|
|
|
int FindIndex(const Member &elem) const {
|
|
return this->FindIndexSub(this->GetRoot(), elem);
|
|
}
|
|
|
|
int FindIndexSub(int index, const Member &elem) const {
|
|
if (index != Index_Nil) {
|
|
auto *node = this->GetNode(index);
|
|
if (Compare{}(elem, node->m_data)) {
|
|
if (!this->IsLeaf(node->m_left)) {
|
|
return this->FindIndexSub(node->m_left, elem);
|
|
}
|
|
} else {
|
|
if (!Compare{}(node->m_data, elem)) {
|
|
return index;
|
|
}
|
|
|
|
if (!this->IsLeaf(node->m_right)) {
|
|
return this->FindIndexSub(node->m_right, elem);
|
|
}
|
|
}
|
|
}
|
|
|
|
return Index_Nil;
|
|
}
|
|
|
|
int FindMaxInSubtree(int index) const {
|
|
int max = index;
|
|
for (auto *node = this->GetNode(index); !this->IsNil(node->m_right); node = this->GetNode(node->m_right)) {
|
|
max = node->m_right;
|
|
}
|
|
return max;
|
|
}
|
|
|
|
int FindMinInSubtree(int index) const {
|
|
int min = index;
|
|
for (auto *node = this->GetNode(index); !this->IsNil(node->m_left); node = this->GetNode(node->m_left)) {
|
|
min = node->m_left;
|
|
}
|
|
return min;
|
|
}
|
|
|
|
int InsertAt(bool before, int parent, const Member &elem) {
|
|
/* Get an index for the new element. */
|
|
const auto index = this->AcquireIndex();
|
|
|
|
/* Create the node. */
|
|
auto *node = this->GetNode(index);
|
|
node->m_color = Color::Red;
|
|
node->m_parent = parent;
|
|
node->m_right = Index_Leaf;
|
|
node->m_left = Index_Leaf;
|
|
std::memcpy(reinterpret_cast<u8 *>(std::addressof(node->m_data)), reinterpret_cast<const u8 *>(std::addressof(elem)), sizeof(node->m_data));
|
|
|
|
/* Fix up the parent node. */
|
|
auto *parent_node = this->GetNode(parent);
|
|
if (before) {
|
|
parent_node->m_left = index;
|
|
if (parent == this->GetLMost()) {
|
|
this->SetLMost(index);
|
|
}
|
|
} else {
|
|
parent_node->m_right = index;
|
|
if (parent == this->GetRMost()) {
|
|
this->SetRMost(index);
|
|
}
|
|
}
|
|
|
|
/* Ensure the tree is balanced. */
|
|
int cur_index = index;
|
|
while (true) {
|
|
auto *cur_node = this->GetNode(cur_index);
|
|
if (this->GetNode(cur_node->m_parent)->m_color != Color::Red) {
|
|
break;
|
|
}
|
|
|
|
auto *p_node = this->GetNode(cur_node->m_parent);
|
|
auto *g_node = this->GetNode(p_node->m_parent);
|
|
if (cur_node->m_parent == g_node->m_left) {
|
|
if (auto *gr_node = this->GetNode(g_node->m_right); gr_node->m_color == Color::Red) {
|
|
p_node->m_color = Color::Black;
|
|
gr_node->m_color = Color::Black;
|
|
g_node->m_color = Color::Red;
|
|
AMS_ASSERT(m_p_dummy_leaf->m_color != Color::Red);
|
|
|
|
cur_index = p_node->m_parent;
|
|
continue;
|
|
}
|
|
|
|
if (cur_index == p_node->m_right) {
|
|
cur_index = cur_node->m_parent;
|
|
cur_node = this->GetNode(cur_index);
|
|
this->RotateLeft(cur_index);
|
|
}
|
|
|
|
p_node = this->GetNode(cur_node->m_parent);
|
|
p_node->m_color = Color::Black;
|
|
|
|
g_node = this->GetNode(p_node->m_parent);
|
|
g_node->m_color = Color::Red;
|
|
|
|
AMS_ASSERT(m_p_dummy_leaf->m_color != Color::Red);
|
|
|
|
this->RotateRight(p_node->m_parent);
|
|
} else {
|
|
if (auto *gl_node = this->GetNode(g_node->m_left); gl_node->m_color == Color::Red) {
|
|
p_node->m_color = Color::Black;
|
|
gl_node->m_color = Color::Black;
|
|
g_node->m_color = Color::Red;
|
|
AMS_ASSERT(m_p_dummy_leaf->m_color != Color::Red);
|
|
|
|
cur_index = p_node->m_parent;
|
|
continue;
|
|
}
|
|
|
|
if (cur_index == p_node->m_left) {
|
|
cur_index = cur_node->m_parent;
|
|
cur_node = this->GetNode(cur_index);
|
|
this->RotateRight(cur_index);
|
|
}
|
|
|
|
p_node = this->GetNode(cur_node->m_parent);
|
|
p_node->m_color = Color::Black;
|
|
|
|
g_node = this->GetNode(p_node->m_parent);
|
|
g_node->m_color = Color::Red;
|
|
|
|
AMS_ASSERT(m_p_dummy_leaf->m_color != Color::Red);
|
|
|
|
this->RotateLeft(p_node->m_parent);
|
|
}
|
|
}
|
|
|
|
/* Set root color. */
|
|
this->GetNode(this->GetRoot())->m_color = Color::Black;
|
|
|
|
return index;
|
|
}
|
|
|
|
int InsertNoHint(bool before, const Member &elem) {
|
|
int cur_index = this->GetRoot();
|
|
int prev_index = Index_Nil;
|
|
bool less = true;
|
|
while (cur_index != Index_Nil && cur_index != Index_Leaf) {
|
|
auto *node = this->GetNode(cur_index);
|
|
prev_index = cur_index;
|
|
|
|
if (before) {
|
|
less = Compare{}(node->m_data, elem);
|
|
} else {
|
|
less = Compare{}(elem, node->m_data);
|
|
}
|
|
|
|
if (less) {
|
|
cur_index = node->m_left;
|
|
} else {
|
|
cur_index = node->m_right;
|
|
}
|
|
}
|
|
|
|
if (cur_index == Index_Nil) {
|
|
/* Create a new node. */
|
|
const auto index = this->AcquireIndex();
|
|
auto *node = this->GetNode(index);
|
|
node->m_color = Color::Black;
|
|
node->m_parent = Index_Nil;
|
|
node->m_right = Index_Leaf;
|
|
node->m_left = Index_Leaf;
|
|
std::memcpy(reinterpret_cast<u8 *>(std::addressof(node->m_data)), reinterpret_cast<const u8 *>(std::addressof(elem)), sizeof(node->m_data));
|
|
|
|
this->SetRoot(index);
|
|
this->SetLMost(index);
|
|
this->SetRMost(index);
|
|
|
|
return index;
|
|
} else {
|
|
auto *compare_node = this->GetNode(prev_index);
|
|
if (less) {
|
|
if (prev_index == this->GetLMost()) {
|
|
return this->InsertAt(less, prev_index, elem);
|
|
} else {
|
|
compare_node = this->GetNode(this->UncheckedMM(prev_index));
|
|
}
|
|
}
|
|
|
|
if (Compare{}(compare_node->m_data, elem)) {
|
|
return this->InsertAt(less, prev_index, elem);
|
|
} else {
|
|
return Index_Nil;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
void RotateLeft(int index) {
|
|
/* Determine indices. */
|
|
const auto p_index = this->GetParent(index);
|
|
const auto r_index = this->GetNode(index)->m_right;
|
|
const auto l_index = this->GetNode(index)->m_left;
|
|
const auto rl_index = this->GetNode(r_index)->m_left;
|
|
const auto rr_index = this->GetNode(r_index)->m_right;
|
|
|
|
/* Get nodes. */
|
|
auto *node = this->GetNode(index);
|
|
auto *p_node = this->GetNode(p_index);
|
|
auto *r_node = this->GetNode(r_index);
|
|
auto *l_node = this->GetNode(l_index);
|
|
auto *rl_node = this->GetNode(rl_index);
|
|
auto *rr_node = this->GetNode(rr_index);
|
|
|
|
/* Perform the rotation. */
|
|
if (p_index == Index_Nil) {
|
|
r_node->m_parent = Index_Nil;
|
|
m_header->root_index = r_index;
|
|
} else if (p_node->m_left == index) {
|
|
p_node->SetLeft(r_index, r_node, p_index);
|
|
} else {
|
|
p_node->SetRight(r_index, r_node, p_index);
|
|
}
|
|
r_node->SetLeft(index, node, r_index);
|
|
r_node->SetRight(rr_index, rr_node, r_index);
|
|
node->SetLeft(l_index, l_node, index);
|
|
node->SetRight(rl_index, rl_node, index);
|
|
}
|
|
|
|
void RotateRight(int index) {
|
|
/* Determine indices. */
|
|
const auto p_index = this->GetParent(index);
|
|
const auto l_index = this->GetNode(index)->m_left;
|
|
const auto ll_index = this->GetNode(l_index)->m_left;
|
|
const auto lr_index = this->GetNode(l_index)->m_right;
|
|
const auto r_index = this->GetNode(index)->m_right;
|
|
|
|
/* Get nodes. */
|
|
auto *node = this->GetNode(index);
|
|
auto *p_node = this->GetNode(p_index);
|
|
auto *l_node = this->GetNode(l_index);
|
|
auto *ll_node = this->GetNode(ll_index);
|
|
auto *lr_node = this->GetNode(lr_index);
|
|
auto *r_node = this->GetNode(r_index);
|
|
|
|
/* Perform the rotation. */
|
|
if (p_index == Index_Nil) {
|
|
l_node->m_parent = Index_Nil;
|
|
m_header->root_index = l_index;
|
|
} else if (p_node->m_left == index) {
|
|
p_node->SetLeft(l_index, l_node, p_index);
|
|
} else {
|
|
p_node->SetRight(l_index, l_node, p_index);
|
|
}
|
|
l_node->SetLeft(ll_index, ll_node, l_index);
|
|
l_node->SetRight(index, node, l_index);
|
|
node->SetLeft(lr_index, lr_node, index);
|
|
node->SetRight(r_index, r_node, index);
|
|
}
|
|
|
|
int UncheckedMM(int index) const {
|
|
auto *node = this->GetNode(index);
|
|
if (this->IsNil(index)) {
|
|
index = this->GetRMost();
|
|
node = this->GetNode(index);
|
|
} else if (this->IsNil(node->m_left)) {
|
|
int parent = node->m_parent;
|
|
Node *p;
|
|
|
|
for (p = this->GetNode(parent); !this->IsNil(parent) && index == p->m_left; p = this->GetNode(parent)) {
|
|
index = parent;
|
|
node = p;
|
|
parent = p->m_parent;
|
|
}
|
|
|
|
if (!this->IsNil(index)) {
|
|
index = parent;
|
|
node = p;
|
|
}
|
|
} else {
|
|
index = this->FindMaxInSubtree(node->m_left);
|
|
node = this->GetNode(index);
|
|
}
|
|
|
|
if (this->IsNil(index)) {
|
|
return Index_Leaf;
|
|
} else {
|
|
return index;
|
|
}
|
|
}
|
|
|
|
int UncheckedPP(int index) const {
|
|
auto *node = this->GetNode(index);
|
|
|
|
if (!this->IsNil(index)) {
|
|
if (this->IsNil(node->m_right)) {
|
|
int parent = node->m_parent;
|
|
Node *p;
|
|
|
|
for (p = this->GetNode(parent); !this->IsNil(parent) && index == p->m_right; p = this->GetNode(parent)) {
|
|
index = parent;
|
|
node = p;
|
|
parent = p->m_parent;
|
|
}
|
|
|
|
index = parent;
|
|
node = p;
|
|
} else {
|
|
index = this->FindMinInSubtree(node->m_right);
|
|
node = this->GetNode(index);
|
|
}
|
|
}
|
|
|
|
if (this->IsNil(index)) {
|
|
return Index_Leaf;
|
|
} else {
|
|
return index;
|
|
}
|
|
}
|
|
public:
|
|
void Initialize(size_t num_elements, void *buffer, size_t buffer_size) {
|
|
AMS_ASSERT(num_elements <= max_size);
|
|
|
|
return this->InitializeImpl(static_cast<int>(num_elements), buffer, buffer_size);
|
|
}
|
|
|
|
iterator begin() { return iterator(*this); }
|
|
const_iterator begin() const { return const_iterator(*this); }
|
|
|
|
iterator end() { return m_end_iterator; }
|
|
const_iterator end() const { return m_end_iterator; }
|
|
|
|
size_t size() const { return m_header->cur_elements; }
|
|
|
|
void clear() {
|
|
const auto num_elements = m_header->max_elements;
|
|
const auto buffer_size = m_header->buffer_size;
|
|
AMS_ASSERT(buffer_size == static_cast<u32>(GetRequiredMemorySize(num_elements)));
|
|
|
|
return this->InitializeMemory(num_elements, buffer_size, impl::AvailableIndexFinder::GetSignature());
|
|
}
|
|
|
|
bool erase(const Member &elem) {
|
|
const auto range = this->equal_range(elem);
|
|
if (range.first != range.last) {
|
|
this->EraseByIndex(range.first);
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
iterator find(const Member &elem) {
|
|
if (const auto index = this->FindIndex(elem); index >= 0) {
|
|
return iterator(*this, index);
|
|
} else {
|
|
return this->end();
|
|
}
|
|
}
|
|
|
|
const_iterator find(const Member &elem) const {
|
|
if (const auto index = this->FindIndex(elem); index >= 0) {
|
|
return const_iterator(*this, index);
|
|
} else {
|
|
return this->end();
|
|
}
|
|
}
|
|
|
|
std::pair<iterator, bool> insert(const Member &elem) {
|
|
const auto index = this->InsertNoHint(false, elem);
|
|
const auto it = iterator(*this, index);
|
|
return std::make_pair(it, !this->IsNil(index));
|
|
}
|
|
|
|
IndexPair equal_range(const Member &elem) {
|
|
/* Get node to start iteration. */
|
|
auto cur_index = this->GetRoot();
|
|
auto cur_node = this->GetNode(cur_index);
|
|
|
|
auto min_index = Index_Leaf;
|
|
auto min_node = this->GetNode(min_index);
|
|
|
|
auto max_index = Index_Leaf;
|
|
auto max_node = this->GetNode(max_index);
|
|
|
|
/* Iterate until current is leaf, to find min/max. */
|
|
while (cur_index != Index_Leaf) {
|
|
if (Compare{}(cur_node->m_data, elem)) {
|
|
cur_index = cur_node->m_right;
|
|
cur_node = this->GetNode(cur_index);
|
|
} else {
|
|
if (max_index == Index_Leaf && Compare{}(elem, cur_node->m_data)) {
|
|
max_index = cur_index;
|
|
max_node = this->GetNode(max_index);
|
|
}
|
|
min_index = cur_index;
|
|
min_node = this->GetNode(min_index);
|
|
|
|
cur_index = cur_node->m_left;
|
|
cur_node = this->GetNode(cur_index);
|
|
}
|
|
}
|
|
|
|
/* Iterate again, to find correct range extent for max. */
|
|
cur_index = (max_index == Index_Leaf) ? this->GetRoot() : max_node->m_left;
|
|
cur_node = this->GetNode(cur_index);
|
|
while (cur_index != Index_Leaf) {
|
|
if (Compare{}(elem, cur_node->m_data)) {
|
|
max_index = cur_index;
|
|
max_node = cur_node;
|
|
cur_index = cur_node->m_left;
|
|
} else {
|
|
cur_index = cur_node->m_right;
|
|
}
|
|
cur_node = this->GetNode(cur_index);
|
|
}
|
|
|
|
AMS_UNUSED(min_node);
|
|
return IndexPair{min_index, max_index};
|
|
}
|
|
};
|
|
|
|
|
|
|
|
}
|