diff options
Diffstat (limited to 'src/common')
-rw-r--r-- | src/common/intrusive_red_black_tree.h | 391 |
1 files changed, 210 insertions, 181 deletions
diff --git a/src/common/intrusive_red_black_tree.h b/src/common/intrusive_red_black_tree.h index 3173cc449..b296b639e 100644 --- a/src/common/intrusive_red_black_tree.h +++ b/src/common/intrusive_red_black_tree.h @@ -4,6 +4,8 @@ #pragma once +#include "common/alignment.h" +#include "common/common_funcs.h" #include "common/parent_of_member.h" #include "common/tree.h" @@ -15,32 +17,33 @@ class IntrusiveRedBlackTreeImpl; } +#pragma pack(push, 4) struct IntrusiveRedBlackTreeNode { + YUZU_NON_COPYABLE(IntrusiveRedBlackTreeNode); + public: - using EntryType = RBEntry<IntrusiveRedBlackTreeNode>; + using RBEntry = freebsd::RBEntry<IntrusiveRedBlackTreeNode>; - constexpr IntrusiveRedBlackTreeNode() = default; +private: + RBEntry m_entry; - void SetEntry(const EntryType& new_entry) { - entry = new_entry; - } +public: + explicit IntrusiveRedBlackTreeNode() = default; - [[nodiscard]] EntryType& GetEntry() { - return entry; + [[nodiscard]] constexpr RBEntry& GetRBEntry() { + return m_entry; } - - [[nodiscard]] const EntryType& GetEntry() const { - return entry; + [[nodiscard]] constexpr const RBEntry& GetRBEntry() const { + return m_entry; } -private: - EntryType entry{}; - - friend class impl::IntrusiveRedBlackTreeImpl; - - template <class, class, class> - friend class IntrusiveRedBlackTree; + constexpr void SetRBEntry(const RBEntry& entry) { + m_entry = entry; + } }; +static_assert(sizeof(IntrusiveRedBlackTreeNode) == + 3 * sizeof(void*) + std::max<size_t>(sizeof(freebsd::RBColor), 4)); +#pragma pack(pop) template <class T, class Traits, class Comparator> class IntrusiveRedBlackTree; @@ -48,12 +51,17 @@ class IntrusiveRedBlackTree; namespace impl { class IntrusiveRedBlackTreeImpl { + YUZU_NON_COPYABLE(IntrusiveRedBlackTreeImpl); + private: template <class, class, class> friend class ::Common::IntrusiveRedBlackTree; - using RootType = RBHead<IntrusiveRedBlackTreeNode>; - RootType root; +private: + using RootType = freebsd::RBHead<IntrusiveRedBlackTreeNode>; + +private: + RootType m_root; public: template <bool Const> @@ -81,149 +89,150 @@ public: IntrusiveRedBlackTreeImpl::reference>; private: - pointer node; + pointer m_node; public: - explicit Iterator(pointer n) : node(n) {} + constexpr explicit Iterator(pointer n) : m_node(n) {} - bool operator==(const Iterator& rhs) const { - return this->node == rhs.node; + constexpr bool operator==(const Iterator& rhs) const { + return m_node == rhs.m_node; } - bool operator!=(const Iterator& rhs) const { + constexpr bool operator!=(const Iterator& rhs) const { return !(*this == rhs); } - pointer operator->() const { - return this->node; + constexpr pointer operator->() const { + return m_node; } - reference operator*() const { - return *this->node; + constexpr reference operator*() const { + return *m_node; } - Iterator& operator++() { - this->node = GetNext(this->node); + constexpr Iterator& operator++() { + m_node = GetNext(m_node); return *this; } - Iterator& operator--() { - this->node = GetPrev(this->node); + constexpr Iterator& operator--() { + m_node = GetPrev(m_node); return *this; } - Iterator operator++(int) { + constexpr Iterator operator++(int) { const Iterator it{*this}; ++(*this); return it; } - Iterator operator--(int) { + constexpr Iterator operator--(int) { const Iterator it{*this}; --(*this); return it; } - operator Iterator<true>() const { - return Iterator<true>(this->node); + constexpr operator Iterator<true>() const { + return Iterator<true>(m_node); } }; private: - // Define accessors using RB_* functions. - bool EmptyImpl() const { - return root.IsEmpty(); + constexpr bool EmptyImpl() const { + return m_root.IsEmpty(); } - IntrusiveRedBlackTreeNode* GetMinImpl() const { - return RB_MIN(const_cast<RootType*>(&root)); + constexpr IntrusiveRedBlackTreeNode* GetMinImpl() const { + return freebsd::RB_MIN(const_cast<RootType&>(m_root)); } - IntrusiveRedBlackTreeNode* GetMaxImpl() const { - return RB_MAX(const_cast<RootType*>(&root)); + constexpr IntrusiveRedBlackTreeNode* GetMaxImpl() const { + return freebsd::RB_MAX(const_cast<RootType&>(m_root)); } - IntrusiveRedBlackTreeNode* RemoveImpl(IntrusiveRedBlackTreeNode* node) { - return RB_REMOVE(&root, node); + constexpr IntrusiveRedBlackTreeNode* RemoveImpl(IntrusiveRedBlackTreeNode* node) { + return freebsd::RB_REMOVE(m_root, node); } public: - static IntrusiveRedBlackTreeNode* GetNext(IntrusiveRedBlackTreeNode* node) { - return RB_NEXT(node); + static constexpr IntrusiveRedBlackTreeNode* GetNext(IntrusiveRedBlackTreeNode* node) { + return freebsd::RB_NEXT(node); } - static IntrusiveRedBlackTreeNode* GetPrev(IntrusiveRedBlackTreeNode* node) { - return RB_PREV(node); + static constexpr IntrusiveRedBlackTreeNode* GetPrev(IntrusiveRedBlackTreeNode* node) { + return freebsd::RB_PREV(node); } - static const IntrusiveRedBlackTreeNode* GetNext(const IntrusiveRedBlackTreeNode* node) { + static constexpr IntrusiveRedBlackTreeNode const* GetNext( + IntrusiveRedBlackTreeNode const* node) { return static_cast<const IntrusiveRedBlackTreeNode*>( GetNext(const_cast<IntrusiveRedBlackTreeNode*>(node))); } - static const IntrusiveRedBlackTreeNode* GetPrev(const IntrusiveRedBlackTreeNode* node) { + static constexpr IntrusiveRedBlackTreeNode const* GetPrev( + IntrusiveRedBlackTreeNode const* node) { return static_cast<const IntrusiveRedBlackTreeNode*>( GetPrev(const_cast<IntrusiveRedBlackTreeNode*>(node))); } public: - constexpr IntrusiveRedBlackTreeImpl() {} + constexpr IntrusiveRedBlackTreeImpl() = default; // Iterator accessors. - iterator begin() { + constexpr iterator begin() { return iterator(this->GetMinImpl()); } - const_iterator begin() const { + constexpr const_iterator begin() const { return const_iterator(this->GetMinImpl()); } - iterator end() { + constexpr iterator end() { return iterator(static_cast<IntrusiveRedBlackTreeNode*>(nullptr)); } - const_iterator end() const { + constexpr const_iterator end() const { return const_iterator(static_cast<const IntrusiveRedBlackTreeNode*>(nullptr)); } - const_iterator cbegin() const { + constexpr const_iterator cbegin() const { return this->begin(); } - const_iterator cend() const { + constexpr const_iterator cend() const { return this->end(); } - iterator iterator_to(reference ref) { - return iterator(&ref); + constexpr iterator iterator_to(reference ref) { + return iterator(std::addressof(ref)); } - const_iterator iterator_to(const_reference ref) const { - return const_iterator(&ref); + constexpr const_iterator iterator_to(const_reference ref) const { + return const_iterator(std::addressof(ref)); } // Content management. - bool empty() const { + constexpr bool empty() const { return this->EmptyImpl(); } - reference back() { + constexpr reference back() { return *this->GetMaxImpl(); } - const_reference back() const { + constexpr const_reference back() const { return *this->GetMaxImpl(); } - reference front() { + constexpr reference front() { return *this->GetMinImpl(); } - const_reference front() const { + constexpr const_reference front() const { return *this->GetMinImpl(); } - iterator erase(iterator it) { + constexpr iterator erase(iterator it) { auto cur = std::addressof(*it); auto next = GetNext(cur); this->RemoveImpl(cur); @@ -234,16 +243,16 @@ public: } // namespace impl template <typename T> -concept HasLightCompareType = requires { - { std::is_same<typename T::LightCompareType, void>::value } -> std::convertible_to<bool>; +concept HasRedBlackKeyType = requires { + { std::is_same<typename T::RedBlackKeyType, 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); + consteval auto* GetRedBlackKeyType() { + if constexpr (HasRedBlackKeyType<T>) { + return static_cast<typename T::RedBlackKeyType*>(nullptr); } else { return static_cast<Default*>(nullptr); } @@ -252,16 +261,17 @@ namespace impl { } // namespace impl template <typename T, typename Default> -using LightCompareType = std::remove_pointer_t<decltype(impl::GetLightCompareType<T, Default>())>; +using RedBlackKeyType = std::remove_pointer_t<decltype(impl::GetRedBlackKeyType<T, Default>())>; template <class T, class Traits, class Comparator> class IntrusiveRedBlackTree { + YUZU_NON_COPYABLE(IntrusiveRedBlackTree); public: using ImplType = impl::IntrusiveRedBlackTreeImpl; private: - ImplType impl{}; + ImplType m_impl; public: template <bool Const> @@ -277,9 +287,9 @@ public: 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&; + using key_type = RedBlackKeyType<Comparator, value_type>; + using const_key_pointer = const key_type*; + using const_key_reference = const key_type&; template <bool Const> class Iterator { @@ -298,183 +308,201 @@ public: IntrusiveRedBlackTree::reference>; private: - ImplIterator iterator; + ImplIterator m_impl; private: - explicit Iterator(ImplIterator it) : iterator(it) {} + constexpr explicit Iterator(ImplIterator it) : m_impl(it) {} - explicit Iterator(typename std::conditional<Const, ImplType::const_iterator, - ImplType::iterator>::type::pointer ptr) - : iterator(ptr) {} + constexpr explicit Iterator(typename ImplIterator::pointer p) : m_impl(p) {} - ImplIterator GetImplIterator() const { - return this->iterator; + constexpr ImplIterator GetImplIterator() const { + return m_impl; } public: - bool operator==(const Iterator& rhs) const { - return this->iterator == rhs.iterator; + constexpr bool operator==(const Iterator& rhs) const { + return m_impl == rhs.m_impl; } - bool operator!=(const Iterator& rhs) const { + constexpr bool operator!=(const Iterator& rhs) const { return !(*this == rhs); } - pointer operator->() const { - return Traits::GetParent(std::addressof(*this->iterator)); + constexpr pointer operator->() const { + return Traits::GetParent(std::addressof(*m_impl)); } - reference operator*() const { - return *Traits::GetParent(std::addressof(*this->iterator)); + constexpr reference operator*() const { + return *Traits::GetParent(std::addressof(*m_impl)); } - Iterator& operator++() { - ++this->iterator; + constexpr Iterator& operator++() { + ++m_impl; return *this; } - Iterator& operator--() { - --this->iterator; + constexpr Iterator& operator--() { + --m_impl; return *this; } - Iterator operator++(int) { + constexpr Iterator operator++(int) { const Iterator it{*this}; - ++this->iterator; + ++m_impl; return it; } - Iterator operator--(int) { + constexpr Iterator operator--(int) { const Iterator it{*this}; - --this->iterator; + --m_impl; return it; } - operator Iterator<true>() const { - return Iterator<true>(this->iterator); + constexpr operator Iterator<true>() const { + return Iterator<true>(m_impl); } }; private: - static int CompareImpl(const IntrusiveRedBlackTreeNode* lhs, - const IntrusiveRedBlackTreeNode* rhs) { + static constexpr 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)); + static constexpr int CompareKeyImpl(const_key_reference key, + const IntrusiveRedBlackTreeNode* rhs) { + return Comparator::Compare(key, *Traits::GetParent(rhs)); } // Define accessors using RB_* functions. - IntrusiveRedBlackTreeNode* InsertImpl(IntrusiveRedBlackTreeNode* node) { - return RB_INSERT(&impl.root, node, CompareImpl); + constexpr IntrusiveRedBlackTreeNode* InsertImpl(IntrusiveRedBlackTreeNode* node) { + return freebsd::RB_INSERT(m_impl.m_root, node, CompareImpl); } - IntrusiveRedBlackTreeNode* FindImpl(const IntrusiveRedBlackTreeNode* node) const { - return RB_FIND(const_cast<ImplType::RootType*>(&impl.root), - const_cast<IntrusiveRedBlackTreeNode*>(node), CompareImpl); + constexpr IntrusiveRedBlackTreeNode* FindImpl(IntrusiveRedBlackTreeNode const* node) const { + return freebsd::RB_FIND(const_cast<ImplType::RootType&>(m_impl.m_root), + const_cast<IntrusiveRedBlackTreeNode*>(node), CompareImpl); } - IntrusiveRedBlackTreeNode* NFindImpl(const IntrusiveRedBlackTreeNode* node) const { - return RB_NFIND(const_cast<ImplType::RootType*>(&impl.root), - const_cast<IntrusiveRedBlackTreeNode*>(node), CompareImpl); + constexpr IntrusiveRedBlackTreeNode* NFindImpl(IntrusiveRedBlackTreeNode const* node) const { + return freebsd::RB_NFIND(const_cast<ImplType::RootType&>(m_impl.m_root), + const_cast<IntrusiveRedBlackTreeNode*>(node), CompareImpl); } - IntrusiveRedBlackTreeNode* FindLightImpl(const_light_pointer lelm) const { - return RB_FIND_LIGHT(const_cast<ImplType::RootType*>(&impl.root), - static_cast<const void*>(lelm), LightCompareImpl); + constexpr IntrusiveRedBlackTreeNode* FindKeyImpl(const_key_reference key) const { + return freebsd::RB_FIND_KEY(const_cast<ImplType::RootType&>(m_impl.m_root), key, + CompareKeyImpl); } - IntrusiveRedBlackTreeNode* NFindLightImpl(const_light_pointer lelm) const { - return RB_NFIND_LIGHT(const_cast<ImplType::RootType*>(&impl.root), - static_cast<const void*>(lelm), LightCompareImpl); + constexpr IntrusiveRedBlackTreeNode* NFindKeyImpl(const_key_reference key) const { + return freebsd::RB_NFIND_KEY(const_cast<ImplType::RootType&>(m_impl.m_root), key, + CompareKeyImpl); + } + + constexpr IntrusiveRedBlackTreeNode* FindExistingImpl( + IntrusiveRedBlackTreeNode const* node) const { + return freebsd::RB_FIND_EXISTING(const_cast<ImplType::RootType&>(m_impl.m_root), + const_cast<IntrusiveRedBlackTreeNode*>(node), CompareImpl); + } + + constexpr IntrusiveRedBlackTreeNode* FindExistingKeyImpl(const_key_reference key) const { + return freebsd::RB_FIND_EXISTING_KEY(const_cast<ImplType::RootType&>(m_impl.m_root), key, + CompareKeyImpl); } public: constexpr IntrusiveRedBlackTree() = default; // Iterator accessors. - iterator begin() { - return iterator(this->impl.begin()); + constexpr iterator begin() { + return iterator(m_impl.begin()); } - const_iterator begin() const { - return const_iterator(this->impl.begin()); + constexpr const_iterator begin() const { + return const_iterator(m_impl.begin()); } - iterator end() { - return iterator(this->impl.end()); + constexpr iterator end() { + return iterator(m_impl.end()); } - const_iterator end() const { - return const_iterator(this->impl.end()); + constexpr const_iterator end() const { + return const_iterator(m_impl.end()); } - const_iterator cbegin() const { + constexpr const_iterator cbegin() const { return this->begin(); } - const_iterator cend() const { + constexpr const_iterator cend() const { return this->end(); } - iterator iterator_to(reference ref) { - return iterator(this->impl.iterator_to(*Traits::GetNode(std::addressof(ref)))); + constexpr iterator iterator_to(reference ref) { + return iterator(m_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)))); + constexpr const_iterator iterator_to(const_reference ref) const { + return const_iterator(m_impl.iterator_to(*Traits::GetNode(std::addressof(ref)))); } // Content management. - bool empty() const { - return this->impl.empty(); + constexpr bool empty() const { + return m_impl.empty(); } - reference back() { - return *Traits::GetParent(std::addressof(this->impl.back())); + constexpr reference back() { + return *Traits::GetParent(std::addressof(m_impl.back())); } - const_reference back() const { - return *Traits::GetParent(std::addressof(this->impl.back())); + constexpr const_reference back() const { + return *Traits::GetParent(std::addressof(m_impl.back())); } - reference front() { - return *Traits::GetParent(std::addressof(this->impl.front())); + constexpr reference front() { + return *Traits::GetParent(std::addressof(m_impl.front())); } - const_reference front() const { - return *Traits::GetParent(std::addressof(this->impl.front())); + constexpr const_reference front() const { + return *Traits::GetParent(std::addressof(m_impl.front())); } - iterator erase(iterator it) { - return iterator(this->impl.erase(it.GetImplIterator())); + constexpr iterator erase(iterator it) { + return iterator(m_impl.erase(it.GetImplIterator())); } - iterator insert(reference ref) { + constexpr iterator insert(reference ref) { ImplType::pointer node = Traits::GetNode(std::addressof(ref)); this->InsertImpl(node); return iterator(node); } - iterator find(const_reference ref) const { + constexpr iterator find(const_reference ref) const { return iterator(this->FindImpl(Traits::GetNode(std::addressof(ref)))); } - iterator nfind(const_reference ref) const { + constexpr 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))); + constexpr iterator find_key(const_key_reference ref) const { + return iterator(this->FindKeyImpl(ref)); + } + + constexpr iterator nfind_key(const_key_reference ref) const { + return iterator(this->NFindKeyImpl(ref)); + } + + constexpr iterator find_existing(const_reference ref) const { + return iterator(this->FindExistingImpl(Traits::GetNode(std::addressof(ref)))); } - iterator nfind_light(const_light_reference ref) const { - return iterator(this->NFindLightImpl(std::addressof(ref))); + constexpr iterator find_existing_key(const_key_reference ref) const { + return iterator(this->FindExistingKeyImpl(ref)); } }; -template <auto T, class Derived = impl::GetParentType<T>> +template <auto T, class Derived = Common::impl::GetParentType<T>> class IntrusiveRedBlackTreeMemberTraits; template <class Parent, IntrusiveRedBlackTreeNode Parent::*Member, class Derived> @@ -498,19 +526,16 @@ private: return std::addressof(parent->*Member); } - static constexpr Derived* GetParent(IntrusiveRedBlackTreeNode* node) { - return GetParentPointer<Member, Derived>(node); + static Derived* GetParent(IntrusiveRedBlackTreeNode* node) { + return Common::GetParentPointer<Member, Derived>(node); } - static constexpr Derived const* GetParent(const IntrusiveRedBlackTreeNode* node) { - return GetParentPointer<Member, Derived>(node); + static Derived const* GetParent(IntrusiveRedBlackTreeNode const* node) { + return Common::GetParentPointer<Member, Derived>(node); } - -private: - static constexpr TypedStorage<Derived> DerivedStorage = {}; }; -template <auto T, class Derived = impl::GetParentType<T>> +template <auto T, class Derived = Common::impl::GetParentType<T>> class IntrusiveRedBlackTreeMemberTraitsDeferredAssert; template <class Parent, IntrusiveRedBlackTreeNode Parent::*Member, class Derived> @@ -521,11 +546,6 @@ public: 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; @@ -540,30 +560,36 @@ private: return std::addressof(parent->*Member); } - static constexpr Derived* GetParent(IntrusiveRedBlackTreeNode* node) { - return GetParentPointer<Member, Derived>(node); + static Derived* GetParent(IntrusiveRedBlackTreeNode* node) { + return Common::GetParentPointer<Member, Derived>(node); } - static constexpr Derived const* GetParent(const IntrusiveRedBlackTreeNode* node) { - return GetParentPointer<Member, Derived>(node); + static Derived const* GetParent(IntrusiveRedBlackTreeNode const* node) { + return Common::GetParentPointer<Member, Derived>(node); } }; template <class Derived> -class IntrusiveRedBlackTreeBaseNode : public IntrusiveRedBlackTreeNode { +class alignas(void*) IntrusiveRedBlackTreeBaseNode : public IntrusiveRedBlackTreeNode { public: + using IntrusiveRedBlackTreeNode::IntrusiveRedBlackTreeNode; + constexpr Derived* GetPrev() { - return static_cast<Derived*>(impl::IntrusiveRedBlackTreeImpl::GetPrev(this)); + return static_cast<Derived*>(static_cast<IntrusiveRedBlackTreeBaseNode*>( + impl::IntrusiveRedBlackTreeImpl::GetPrev(this))); } constexpr const Derived* GetPrev() const { - return static_cast<const Derived*>(impl::IntrusiveRedBlackTreeImpl::GetPrev(this)); + return static_cast<const Derived*>(static_cast<const IntrusiveRedBlackTreeBaseNode*>( + impl::IntrusiveRedBlackTreeImpl::GetPrev(this))); } constexpr Derived* GetNext() { - return static_cast<Derived*>(impl::IntrusiveRedBlackTreeImpl::GetNext(this)); + return static_cast<Derived*>(static_cast<IntrusiveRedBlackTreeBaseNode*>( + impl::IntrusiveRedBlackTreeImpl::GetNext(this))); } constexpr const Derived* GetNext() const { - return static_cast<const Derived*>(impl::IntrusiveRedBlackTreeImpl::GetNext(this)); + return static_cast<const Derived*>(static_cast<const IntrusiveRedBlackTreeBaseNode*>( + impl::IntrusiveRedBlackTreeImpl::GetNext(this))); } }; @@ -581,19 +607,22 @@ private: friend class impl::IntrusiveRedBlackTreeImpl; static constexpr IntrusiveRedBlackTreeNode* GetNode(Derived* parent) { - return static_cast<IntrusiveRedBlackTreeNode*>(parent); + return static_cast<IntrusiveRedBlackTreeNode*>( + static_cast<IntrusiveRedBlackTreeBaseNode<Derived>*>(parent)); } static constexpr IntrusiveRedBlackTreeNode const* GetNode(Derived const* parent) { - return static_cast<const IntrusiveRedBlackTreeNode*>(parent); + return static_cast<const IntrusiveRedBlackTreeNode*>( + static_cast<const IntrusiveRedBlackTreeBaseNode<Derived>*>(parent)); } static constexpr Derived* GetParent(IntrusiveRedBlackTreeNode* node) { - return static_cast<Derived*>(node); + return static_cast<Derived*>(static_cast<IntrusiveRedBlackTreeBaseNode<Derived>*>(node)); } - static constexpr Derived const* GetParent(const IntrusiveRedBlackTreeNode* node) { - return static_cast<const Derived*>(node); + static constexpr Derived const* GetParent(IntrusiveRedBlackTreeNode const* node) { + return static_cast<const Derived*>( + static_cast<const IntrusiveRedBlackTreeBaseNode<Derived>*>(node)); } }; |