suyu/src/common/intrusive_red_black_tree.h
Lioncash 703c57a119 common/parent_of_member: Replace TYPED_STORAGE define with template alias
Provides the same construct, but makes it obey namespacing.
2021-01-11 18:26:04 -05:00

627 lines
19 KiB
C++

// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include "common/parent_of_member.h"
#include "common/tree.h"
namespace Common {
namespace impl {
class IntrusiveRedBlackTreeImpl;
}
struct IntrusiveRedBlackTreeNode {
private:
RB_ENTRY(IntrusiveRedBlackTreeNode) entry{};
friend class impl::IntrusiveRedBlackTreeImpl;
template <class, class, class>
friend class IntrusiveRedBlackTree;
public:
constexpr IntrusiveRedBlackTreeNode() = default;
};
template <class T, class Traits, class Comparator>
class IntrusiveRedBlackTree;
namespace impl {
class IntrusiveRedBlackTreeImpl {
private:
template <class, class, class>
friend class ::Common::IntrusiveRedBlackTree;
private:
RB_HEAD(IntrusiveRedBlackTreeRoot, IntrusiveRedBlackTreeNode);
using RootType = IntrusiveRedBlackTreeRoot;
private:
IntrusiveRedBlackTreeRoot root;
public:
template <bool Const>
class Iterator;
using value_type = IntrusiveRedBlackTreeNode;
using size_type = size_t;
using difference_type = ptrdiff_t;
using pointer = value_type*;
using const_pointer = const value_type*;
using reference = value_type&;
using const_reference = const value_type&;
using iterator = Iterator<false>;
using const_iterator = Iterator<true>;
template <bool Const>
class Iterator {
public:
using iterator_category = std::bidirectional_iterator_tag;
using value_type = typename IntrusiveRedBlackTreeImpl::value_type;
using difference_type = typename IntrusiveRedBlackTreeImpl::difference_type;
using pointer = std::conditional_t<Const, IntrusiveRedBlackTreeImpl::const_pointer,
IntrusiveRedBlackTreeImpl::pointer>;
using reference = std::conditional_t<Const, IntrusiveRedBlackTreeImpl::const_reference,
IntrusiveRedBlackTreeImpl::reference>;
private:
pointer node;
public:
explicit Iterator(pointer n) : node(n) {}
bool operator==(const Iterator& rhs) const {
return this->node == rhs.node;
}
bool operator!=(const Iterator& rhs) const {
return !(*this == rhs);
}
pointer operator->() const {
return this->node;
}
reference operator*() const {
return *this->node;
}
Iterator& operator++() {
this->node = GetNext(this->node);
return *this;
}
Iterator& operator--() {
this->node = GetPrev(this->node);
return *this;
}
Iterator operator++(int) {
const Iterator it{*this};
++(*this);
return it;
}
Iterator operator--(int) {
const Iterator it{*this};
--(*this);
return it;
}
operator Iterator<true>() const {
return Iterator<true>(this->node);
}
};
protected:
// Generate static implementations for non-comparison operations for IntrusiveRedBlackTreeRoot.
RB_GENERATE_WITHOUT_COMPARE_STATIC(IntrusiveRedBlackTreeRoot, IntrusiveRedBlackTreeNode, entry);
private:
// Define accessors using RB_* functions.
constexpr void InitializeImpl() {
RB_INIT(&this->root);
}
bool EmptyImpl() const {
return RB_EMPTY(&this->root);
}
IntrusiveRedBlackTreeNode* GetMinImpl() const {
return RB_MIN(IntrusiveRedBlackTreeRoot,
const_cast<IntrusiveRedBlackTreeRoot*>(&this->root));
}
IntrusiveRedBlackTreeNode* GetMaxImpl() const {
return RB_MAX(IntrusiveRedBlackTreeRoot,
const_cast<IntrusiveRedBlackTreeRoot*>(&this->root));
}
IntrusiveRedBlackTreeNode* RemoveImpl(IntrusiveRedBlackTreeNode* node) {
return RB_REMOVE(IntrusiveRedBlackTreeRoot, &this->root, node);
}
public:
static IntrusiveRedBlackTreeNode* GetNext(IntrusiveRedBlackTreeNode* node) {
return RB_NEXT(IntrusiveRedBlackTreeRoot, nullptr, node);
}
static IntrusiveRedBlackTreeNode* GetPrev(IntrusiveRedBlackTreeNode* node) {
return RB_PREV(IntrusiveRedBlackTreeRoot, nullptr, node);
}
static IntrusiveRedBlackTreeNode const* GetNext(const IntrusiveRedBlackTreeNode* node) {
return static_cast<const IntrusiveRedBlackTreeNode*>(
GetNext(const_cast<IntrusiveRedBlackTreeNode*>(node)));
}
static IntrusiveRedBlackTreeNode const* GetPrev(const IntrusiveRedBlackTreeNode* node) {
return static_cast<const IntrusiveRedBlackTreeNode*>(
GetPrev(const_cast<IntrusiveRedBlackTreeNode*>(node)));
}
public:
constexpr IntrusiveRedBlackTreeImpl() : root() {
this->InitializeImpl();
}
// Iterator accessors.
iterator begin() {
return iterator(this->GetMinImpl());
}
const_iterator begin() const {
return const_iterator(this->GetMinImpl());
}
iterator end() {
return iterator(static_cast<IntrusiveRedBlackTreeNode*>(nullptr));
}
const_iterator end() const {
return const_iterator(static_cast<const IntrusiveRedBlackTreeNode*>(nullptr));
}
const_iterator cbegin() const {
return this->begin();
}
const_iterator cend() const {
return this->end();
}
iterator iterator_to(reference ref) {
return iterator(&ref);
}
const_iterator iterator_to(const_reference ref) const {
return const_iterator(&ref);
}
// Content management.
bool empty() const {
return this->EmptyImpl();
}
reference back() {
return *this->GetMaxImpl();
}
const_reference back() const {
return *this->GetMaxImpl();
}
reference front() {
return *this->GetMinImpl();
}
const_reference front() const {
return *this->GetMinImpl();
}
iterator erase(iterator it) {
auto cur = std::addressof(*it);
auto next = GetNext(cur);
this->RemoveImpl(cur);
return iterator(next);
}
};
} // namespace impl
template <typename T>
concept HasLightCompareType = requires {
{ std::is_same<typename T::LightCompareType, void>::value }
->std::convertible_to<bool>;
};
namespace impl {
template <typename T, typename Default>
consteval auto* GetLightCompareType() {
if constexpr (HasLightCompareType<T>) {
return static_cast<typename T::LightCompareType*>(nullptr);
} else {
return static_cast<Default*>(nullptr);
}
}
} // namespace impl
template <typename T, typename Default>
using LightCompareType = std::remove_pointer_t<decltype(impl::GetLightCompareType<T, Default>())>;
template <class T, class Traits, class Comparator>
class IntrusiveRedBlackTree {
public:
using ImplType = impl::IntrusiveRedBlackTreeImpl;
private:
ImplType impl{};
public:
struct IntrusiveRedBlackTreeRootWithCompare : ImplType::IntrusiveRedBlackTreeRoot {};
template <bool Const>
class Iterator;
using value_type = T;
using size_type = size_t;
using difference_type = ptrdiff_t;
using pointer = T*;
using const_pointer = const T*;
using reference = T&;
using const_reference = const T&;
using iterator = Iterator<false>;
using const_iterator = Iterator<true>;
using light_value_type = LightCompareType<Comparator, value_type>;
using const_light_pointer = const light_value_type*;
using const_light_reference = const light_value_type&;
template <bool Const>
class Iterator {
public:
friend class IntrusiveRedBlackTree<T, Traits, Comparator>;
using ImplIterator =
std::conditional_t<Const, ImplType::const_iterator, ImplType::iterator>;
using iterator_category = std::bidirectional_iterator_tag;
using value_type = typename IntrusiveRedBlackTree::value_type;
using difference_type = typename IntrusiveRedBlackTree::difference_type;
using pointer = std::conditional_t<Const, IntrusiveRedBlackTree::const_pointer,
IntrusiveRedBlackTree::pointer>;
using reference = std::conditional_t<Const, IntrusiveRedBlackTree::const_reference,
IntrusiveRedBlackTree::reference>;
private:
ImplIterator iterator;
private:
explicit Iterator(ImplIterator it) : iterator(it) {}
explicit Iterator(typename std::conditional<Const, ImplType::const_iterator,
ImplType::iterator>::type::pointer ptr)
: iterator(ptr) {}
ImplIterator GetImplIterator() const {
return this->iterator;
}
public:
bool operator==(const Iterator& rhs) const {
return this->iterator == rhs.iterator;
}
bool operator!=(const Iterator& rhs) const {
return !(*this == rhs);
}
pointer operator->() const {
return Traits::GetParent(std::addressof(*this->iterator));
}
reference operator*() const {
return *Traits::GetParent(std::addressof(*this->iterator));
}
Iterator& operator++() {
++this->iterator;
return *this;
}
Iterator& operator--() {
--this->iterator;
return *this;
}
Iterator operator++(int) {
const Iterator it{*this};
++this->iterator;
return it;
}
Iterator operator--(int) {
const Iterator it{*this};
--this->iterator;
return it;
}
operator Iterator<true>() const {
return Iterator<true>(this->iterator);
}
};
private:
// Generate static implementations for comparison operations for IntrusiveRedBlackTreeRoot.
RB_GENERATE_WITH_COMPARE_STATIC(IntrusiveRedBlackTreeRootWithCompare, IntrusiveRedBlackTreeNode,
entry, CompareImpl, LightCompareImpl);
private:
static int CompareImpl(const IntrusiveRedBlackTreeNode* lhs,
const IntrusiveRedBlackTreeNode* rhs) {
return Comparator::Compare(*Traits::GetParent(lhs), *Traits::GetParent(rhs));
}
static int LightCompareImpl(const void* elm, const IntrusiveRedBlackTreeNode* rhs) {
return Comparator::Compare(*static_cast<const_light_pointer>(elm), *Traits::GetParent(rhs));
}
// Define accessors using RB_* functions.
IntrusiveRedBlackTreeNode* InsertImpl(IntrusiveRedBlackTreeNode* node) {
return RB_INSERT(IntrusiveRedBlackTreeRootWithCompare,
static_cast<IntrusiveRedBlackTreeRootWithCompare*>(&this->impl.root),
node);
}
IntrusiveRedBlackTreeNode* FindImpl(const IntrusiveRedBlackTreeNode* node) const {
return RB_FIND(
IntrusiveRedBlackTreeRootWithCompare,
const_cast<IntrusiveRedBlackTreeRootWithCompare*>(
static_cast<const IntrusiveRedBlackTreeRootWithCompare*>(&this->impl.root)),
const_cast<IntrusiveRedBlackTreeNode*>(node));
}
IntrusiveRedBlackTreeNode* NFindImpl(const IntrusiveRedBlackTreeNode* node) const {
return RB_NFIND(
IntrusiveRedBlackTreeRootWithCompare,
const_cast<IntrusiveRedBlackTreeRootWithCompare*>(
static_cast<const IntrusiveRedBlackTreeRootWithCompare*>(&this->impl.root)),
const_cast<IntrusiveRedBlackTreeNode*>(node));
}
IntrusiveRedBlackTreeNode* FindLightImpl(const_light_pointer lelm) const {
return RB_FIND_LIGHT(
IntrusiveRedBlackTreeRootWithCompare,
const_cast<IntrusiveRedBlackTreeRootWithCompare*>(
static_cast<const IntrusiveRedBlackTreeRootWithCompare*>(&this->impl.root)),
static_cast<const void*>(lelm));
}
IntrusiveRedBlackTreeNode* NFindLightImpl(const_light_pointer lelm) const {
return RB_NFIND_LIGHT(
IntrusiveRedBlackTreeRootWithCompare,
const_cast<IntrusiveRedBlackTreeRootWithCompare*>(
static_cast<const IntrusiveRedBlackTreeRootWithCompare*>(&this->impl.root)),
static_cast<const void*>(lelm));
}
public:
constexpr IntrusiveRedBlackTree() = default;
// Iterator accessors.
iterator begin() {
return iterator(this->impl.begin());
}
const_iterator begin() const {
return const_iterator(this->impl.begin());
}
iterator end() {
return iterator(this->impl.end());
}
const_iterator end() const {
return const_iterator(this->impl.end());
}
const_iterator cbegin() const {
return this->begin();
}
const_iterator cend() const {
return this->end();
}
iterator iterator_to(reference ref) {
return iterator(this->impl.iterator_to(*Traits::GetNode(std::addressof(ref))));
}
const_iterator iterator_to(const_reference ref) const {
return const_iterator(this->impl.iterator_to(*Traits::GetNode(std::addressof(ref))));
}
// Content management.
bool empty() const {
return this->impl.empty();
}
reference back() {
return *Traits::GetParent(std::addressof(this->impl.back()));
}
const_reference back() const {
return *Traits::GetParent(std::addressof(this->impl.back()));
}
reference front() {
return *Traits::GetParent(std::addressof(this->impl.front()));
}
const_reference front() const {
return *Traits::GetParent(std::addressof(this->impl.front()));
}
iterator erase(iterator it) {
return iterator(this->impl.erase(it.GetImplIterator()));
}
iterator insert(reference ref) {
ImplType::pointer node = Traits::GetNode(std::addressof(ref));
this->InsertImpl(node);
return iterator(node);
}
iterator find(const_reference ref) const {
return iterator(this->FindImpl(Traits::GetNode(std::addressof(ref))));
}
iterator nfind(const_reference ref) const {
return iterator(this->NFindImpl(Traits::GetNode(std::addressof(ref))));
}
iterator find_light(const_light_reference ref) const {
return iterator(this->FindLightImpl(std::addressof(ref)));
}
iterator nfind_light(const_light_reference ref) const {
return iterator(this->NFindLightImpl(std::addressof(ref)));
}
};
template <auto T, class Derived = impl::GetParentType<T>>
class IntrusiveRedBlackTreeMemberTraits;
template <class Parent, IntrusiveRedBlackTreeNode Parent::*Member, class Derived>
class IntrusiveRedBlackTreeMemberTraits<Member, Derived> {
public:
template <class Comparator>
using TreeType = IntrusiveRedBlackTree<Derived, IntrusiveRedBlackTreeMemberTraits, Comparator>;
using TreeTypeImpl = impl::IntrusiveRedBlackTreeImpl;
private:
template <class, class, class>
friend class IntrusiveRedBlackTree;
friend class impl::IntrusiveRedBlackTreeImpl;
static constexpr IntrusiveRedBlackTreeNode* GetNode(Derived* parent) {
return std::addressof(parent->*Member);
}
static constexpr IntrusiveRedBlackTreeNode const* GetNode(Derived const* parent) {
return std::addressof(parent->*Member);
}
static constexpr Derived* GetParent(IntrusiveRedBlackTreeNode* node) {
return GetParentPointer<Member, Derived>(node);
}
static constexpr Derived const* GetParent(const IntrusiveRedBlackTreeNode* node) {
return GetParentPointer<Member, Derived>(node);
}
private:
static constexpr TypedStorage<Derived> DerivedStorage = {};
static_assert(GetParent(GetNode(GetPointer(DerivedStorage))) == GetPointer(DerivedStorage));
};
template <auto T, class Derived = impl::GetParentType<T>>
class IntrusiveRedBlackTreeMemberTraitsDeferredAssert;
template <class Parent, IntrusiveRedBlackTreeNode Parent::*Member, class Derived>
class IntrusiveRedBlackTreeMemberTraitsDeferredAssert<Member, Derived> {
public:
template <class Comparator>
using TreeType =
IntrusiveRedBlackTree<Derived, IntrusiveRedBlackTreeMemberTraitsDeferredAssert, Comparator>;
using TreeTypeImpl = impl::IntrusiveRedBlackTreeImpl;
static constexpr bool IsValid() {
TypedStorage<Derived> DerivedStorage = {};
return GetParent(GetNode(GetPointer(DerivedStorage))) == GetPointer(DerivedStorage);
}
private:
template <class, class, class>
friend class IntrusiveRedBlackTree;
friend class impl::IntrusiveRedBlackTreeImpl;
static constexpr IntrusiveRedBlackTreeNode* GetNode(Derived* parent) {
return std::addressof(parent->*Member);
}
static constexpr IntrusiveRedBlackTreeNode const* GetNode(Derived const* parent) {
return std::addressof(parent->*Member);
}
static constexpr Derived* GetParent(IntrusiveRedBlackTreeNode* node) {
return GetParentPointer<Member, Derived>(node);
}
static constexpr Derived const* GetParent(const IntrusiveRedBlackTreeNode* node) {
return GetParentPointer<Member, Derived>(node);
}
};
template <class Derived>
class IntrusiveRedBlackTreeBaseNode : public IntrusiveRedBlackTreeNode {
public:
constexpr Derived* GetPrev() {
return static_cast<Derived*>(impl::IntrusiveRedBlackTreeImpl::GetPrev(this));
}
constexpr const Derived* GetPrev() const {
return static_cast<const Derived*>(impl::IntrusiveRedBlackTreeImpl::GetPrev(this));
}
constexpr Derived* GetNext() {
return static_cast<Derived*>(impl::IntrusiveRedBlackTreeImpl::GetNext(this));
}
constexpr const Derived* GetNext() const {
return static_cast<const Derived*>(impl::IntrusiveRedBlackTreeImpl::GetNext(this));
}
};
template <class Derived>
class IntrusiveRedBlackTreeBaseTraits {
public:
template <class Comparator>
using TreeType = IntrusiveRedBlackTree<Derived, IntrusiveRedBlackTreeBaseTraits, Comparator>;
using TreeTypeImpl = impl::IntrusiveRedBlackTreeImpl;
private:
template <class, class, class>
friend class IntrusiveRedBlackTree;
friend class impl::IntrusiveRedBlackTreeImpl;
static constexpr IntrusiveRedBlackTreeNode* GetNode(Derived* parent) {
return static_cast<IntrusiveRedBlackTreeNode*>(parent);
}
static constexpr IntrusiveRedBlackTreeNode const* GetNode(Derived const* parent) {
return static_cast<const IntrusiveRedBlackTreeNode*>(parent);
}
static constexpr Derived* GetParent(IntrusiveRedBlackTreeNode* node) {
return static_cast<Derived*>(node);
}
static constexpr Derived const* GetParent(const IntrusiveRedBlackTreeNode* node) {
return static_cast<const Derived*>(node);
}
};
} // namespace Common