BSTArray.h

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#pragma once
 
#include "RE/M/MemoryManager.h"
 
namespace RE
{
    class ScrapHeap;
 
    class BSTArrayBase
    {
    public:
        using size_type = std::uint32_t;
 
        class IAllocatorFunctor
        {
        public:
            inline static constexpr auto RTTI = RTTI_BSTArrayBase__IAllocatorFunctor;
 
            // add
            virtual bool Allocate(std::uint32_t a_num, std::uint32_t a_elemSize) = 0;                                                                                                             // 00
            virtual bool Reallocate(std::uint32_t a_minNewSizeInItems, std::uint32_t a_frontCopyCount, std::uint32_t a_shiftCount, std::uint32_t a_backCopyCount, std::uint32_t a_elemSize) = 0;  // 01
            virtual void Deallocate() = 0;                                                                                                                                                        // 02
 
            virtual ~IAllocatorFunctor() = default;  // 03
 
            TES_HEAP_REDEFINE_NEW();
        };
        static_assert(sizeof(IAllocatorFunctor) == 0x8);
 
        constexpr BSTArrayBase() noexcept = default;
        constexpr BSTArrayBase(const BSTArrayBase&) noexcept = default;
        constexpr BSTArrayBase(BSTArrayBase&&) noexcept = default;
 
        inline ~BSTArrayBase() noexcept { _size = 0; }
 
        BSTArrayBase& operator=(const BSTArrayBase&) noexcept = default;
        BSTArrayBase& operator=(BSTArrayBase&&) noexcept = default;
 
        [[nodiscard]] constexpr bool      empty() const noexcept { return _size == 0; }
        [[nodiscard]] constexpr size_type size() const noexcept { return _size; }
 
    protected:
        constexpr void set_size(size_type a_size) noexcept { _size = a_size; }
 
    private:
        // members
        std::uint32_t _size{ 0 };  // 0
    };
    static_assert(sizeof(BSTArrayBase) == 0x4);
 
    class BSTArrayHeapAllocator
    {
    public:
        using size_type = std::uint32_t;
 
        constexpr BSTArrayHeapAllocator() noexcept = default;
 
        inline BSTArrayHeapAllocator(const BSTArrayHeapAllocator& a_rhs)
        {
            if (a_rhs.data()) {
                _capacity = a_rhs.capacity();
                _data = allocate(capacity());
                std::memcpy(data(), a_rhs.data(), capacity());
            }
        }
 
        constexpr BSTArrayHeapAllocator(BSTArrayHeapAllocator&& a_rhs) noexcept :
            _data(a_rhs.data()),
            _capacity(a_rhs.capacity())
        {
            a_rhs._data = nullptr;
            a_rhs._capacity = 0;
        }
 
        inline ~BSTArrayHeapAllocator()
        {
            deallocate(data());
            _data = nullptr;
            _capacity = 0;
        }
 
        inline BSTArrayHeapAllocator& operator=(const BSTArrayHeapAllocator& a_rhs)
        {
            if (this != std::addressof(a_rhs)) {
                deallocate(data());
                _data = nullptr;
                _capacity = 0;
 
                if (a_rhs.data()) {
                    _capacity = a_rhs.capacity();
                    _data = allocate(capacity());
                    std::memcpy(data(), a_rhs.data(), capacity());
                }
            }
            return *this;
        }
 
        inline BSTArrayHeapAllocator& operator=(BSTArrayHeapAllocator&& a_rhs)
        {
            if (this != std::addressof(a_rhs)) {
                deallocate(data());
                _data = a_rhs.data();
                _capacity = a_rhs.capacity();
 
                a_rhs._data = nullptr;
                a_rhs._capacity = 0;
            }
            return *this;
        }
 
        TES_HEAP_REDEFINE_NEW();
 
        [[nodiscard]] constexpr void*       data() noexcept { return _data; }
        [[nodiscard]] constexpr const void* data() const noexcept { return _data; }
 
        [[nodiscard]] constexpr size_type capacity() const noexcept { return _capacity; }
 
    protected:
        inline void* allocate(std::size_t a_size)
        {
            const auto mem = malloc(a_size);
            if (!mem) {
                stl::report_and_fail("out of memory"sv);
            } else {
                std::memset(mem, 0, a_size);
                return mem;
            }
        }
 
        inline void deallocate(void* a_ptr) { free(a_ptr); }
 
        constexpr void set_allocator_traits(void* a_data, std::uint32_t a_capacity, std::size_t) noexcept
        {
            _data = a_data;
            _capacity = a_capacity;
        }
 
    private:
        // members
        void*         _data{ nullptr };  // 00
        std::uint32_t _capacity{ 0 };    // 08
    };
    static_assert(sizeof(BSTArrayHeapAllocator) == 0x10);
 
    template <std::uint32_t N>
    class BSTSmallArrayHeapAllocator
    {
    public:
        using size_type = std::uint32_t;
 
        constexpr BSTSmallArrayHeapAllocator() noexcept :
            _capacity(0),
            _local(1)
        {}
 
        inline BSTSmallArrayHeapAllocator(const BSTSmallArrayHeapAllocator& a_rhs) :
            _capacity(0),
            _local(1)
        {
            copy(a_rhs);
        }
 
        inline BSTSmallArrayHeapAllocator(BSTSmallArrayHeapAllocator&& a_rhs) :
            _capacity(0),
            _local(1)
        {
            copy(std::move(a_rhs));
        }
 
        inline ~BSTSmallArrayHeapAllocator() { release(); }
 
        inline BSTSmallArrayHeapAllocator& operator=(const BSTSmallArrayHeapAllocator& a_rhs)
        {
            if (this != std::addressof(a_rhs)) {
                copy(a_rhs);
            }
            return *this;
        }
 
        inline BSTSmallArrayHeapAllocator& operator=(BSTSmallArrayHeapAllocator&& a_rhs)
        {
            if (this != std::addressof(a_rhs)) {
                copy(std::move(a_rhs));
            }
            return *this;
        }
 
        TES_HEAP_REDEFINE_NEW();
 
        [[nodiscard]] constexpr void*       data() noexcept { return local() ? _data.local : _data.heap; }
        [[nodiscard]] constexpr const void* data() const noexcept { return local() ? _data.local : _data.heap; }
 
        [[nodiscard]] constexpr size_type capacity() const noexcept { return _capacity; }
 
    protected:
        void* allocate(std::size_t a_size)
        {
            if (a_size > N) {
                const auto mem = malloc(a_size);
                if (!mem) {
                    stl::report_and_fail("out of memory"sv);
                } else {
                    std::memset(mem, 0, a_size);
                    return mem;
                }
            } else {
                return _data.local;
            }
        }
 
        void deallocate(void* a_ptr)
        {
            if (a_ptr != _data.local) {
                free(a_ptr);
            }
        }
 
        constexpr void set_allocator_traits(void* a_data, std::uint32_t a_capacity, std::size_t a_typeSize) noexcept
        {
            _capacity = a_capacity;
            if (a_capacity * a_typeSize > N) {
                _local = 0;
                _data.heap = a_data;
            }
        }
 
    private:
        union Data
        {
            void* heap;
            char  local[N]{ 0 };
        };
 
        inline void copy(const BSTSmallArrayHeapAllocator& a_rhs)
        {
            release();
 
            _capacity = a_rhs._capacity;
            _local = a_rhs._local;
 
            if (!local()) {
                const auto mem = malloc(capacity());
                if (!mem) {
                    stl::report_and_fail("out of memory"sv);
                } else {
                    _data.heap = mem;
                }
            }
 
            std::memcpy(data(), a_rhs.data(), capacity());
        }
 
        inline void copy(BSTSmallArrayHeapAllocator&& a_rhs)
        {
            release();
 
            _capacity = a_rhs._capacity;
            _local = a_rhs._local;
            std::memmove(data(), a_rhs.data(), capacity());
 
            std::memset(a_rhs.data(), 0, a_rhs.capacity());
            a_rhs._capacity = N;
            a_rhs._local = 1;
        }
 
        [[nodiscard]] constexpr bool local() const noexcept { return _local != 0; }
 
        inline void release()
        {
            if (!local()) {
                free(_data.heap);
            }
 
            std::memset(data(), 0, capacity());
            _capacity = N;
            _local = 1;
        }
 
        // members
        std::uint32_t _capacity: 31;  // 00
        std::uint32_t _local: 1;      // 00
        Data          _data;          // 08
    };
 
    class BSScrapArrayAllocator
    {
    public:
        using size_type = std::uint32_t;
 
        constexpr BSScrapArrayAllocator() noexcept = default;
 
        inline BSScrapArrayAllocator(const BSScrapArrayAllocator& a_rhs) :
            _capacity(a_rhs._capacity)
        {
            if (capacity() > 0) {
                _data = allocate(capacity());
                std::memcpy(data(), a_rhs.data(), capacity());
            }
        }
 
        constexpr BSScrapArrayAllocator(BSScrapArrayAllocator&& a_rhs) noexcept :
            _allocator(a_rhs._allocator),
            _data(a_rhs._data),
            _capacity(a_rhs._capacity)
        {
            a_rhs._allocator = nullptr;
            a_rhs._data = nullptr;
            a_rhs._capacity = 0;
        }
 
        ~BSScrapArrayAllocator();
 
        inline BSScrapArrayAllocator& operator=(const BSScrapArrayAllocator& a_rhs)
        {
            if (this != std::addressof(a_rhs)) {
                if (_data) {
                    deallocate(_data);
                    _data = nullptr;
                }
 
                _capacity = a_rhs.capacity();
                if (capacity() > 0) {
                    _data = allocate(capacity());
                    std::memcpy(data(), a_rhs.data(), capacity());
                }
            }
            return *this;
        }
 
        inline BSScrapArrayAllocator& operator=(BSScrapArrayAllocator&& a_rhs)
        {
            if (this != std::addressof(a_rhs)) {
                if (_data) {
                    deallocate(_data);
                }
 
                _allocator = a_rhs._allocator;
                _data = a_rhs._data;
                _capacity = a_rhs._capacity;
 
                a_rhs._allocator = nullptr;
                a_rhs._data = nullptr;
                a_rhs._capacity = 0;
            }
            return *this;
        }
 
        TES_HEAP_REDEFINE_NEW();
 
        [[nodiscard]] constexpr void*       data() noexcept { return _data; }
        [[nodiscard]] constexpr const void* data() const noexcept { return _data; }
 
        [[nodiscard]] constexpr size_type capacity() const noexcept { return _capacity; }
 
    protected:
        void* allocate(std::size_t a_size);
        void  deallocate(void* a_ptr);
 
        constexpr void set_allocator_traits(void* a_data, std::uint32_t a_capacity, std::size_t) noexcept
        {
            _data = a_data;
            _capacity = a_capacity;
        }
 
    private:
        // members
        ScrapHeap* _allocator{ nullptr };  // 00
        void*      _data{ nullptr };       // 08
        size_type  _capacity{ 0 };         // 10
    };
    static_assert(sizeof(BSScrapArrayAllocator) == 0x18);
 
    template <class T, class Allocator = BSTArrayHeapAllocator>
    class BSTArray :
        public Allocator,
        public BSTArrayBase
    {
    public:
        using allocator_type = Allocator;
        using size_type = typename BSTArrayBase::size_type;
        using value_type = T;
        using pointer = value_type*;
        using const_pointer = const value_type*;
        using reference = value_type&;
        using const_reference = const value_type&;
        using iterator = pointer;
        using const_iterator = const_pointer;
 
        BSTArray() = default;
 
        inline BSTArray(const BSTArray& a_rhs)
        {
            const auto newCapacity = a_rhs.capacity();
            if (newCapacity == 0) {
                return;
            }
 
            const auto newSize = a_rhs.size();
            const auto newData = allocate(newCapacity);
            for (size_type i = 0; i < newSize; ++i) {
                std::construct_at(newData + i, a_rhs[i]);
            }
 
            set_allocator_traits(newData, newCapacity);
            set_size(newSize);
        }
 
        BSTArray(BSTArray&&) = default;
 
        explicit inline BSTArray(size_type a_count)
        {
            if (a_count == 0) {
                return;
            }
 
            const auto newCapacity = a_count;
            const auto newSize = a_count;
            const auto newData = allocate(newCapacity);
            for (size_type i = 0; i < newSize; ++i) {
                std::construct_at(newData + i);
            }
 
            set_allocator_traits(newData, newCapacity);
            set_size(newSize);
        }
 
        inline ~BSTArray() { release(); }
 
        inline BSTArray& operator=(const BSTArray& a_rhs)
        {
            if (this != std::addressof(a_rhs)) {
                clear();
 
                const auto newCapacity = a_rhs.capacity();
                change_capacity(newCapacity);
 
                const auto newSize = a_rhs.size();
                set_size(newSize);
 
                const auto newData = data();
                for (size_type i = 0; i < newSize; ++i) {
                    std::construct_at(newData + i, a_rhs[i]);
                }
            }
            return *this;
        }
 
        BSTArray& operator=(BSTArray&& a_rhs)
        {
            if (this != std::addressof(a_rhs)) {
                release();
 
                const auto newCapacity = a_rhs.capacity();
                const auto newSize = a_rhs.size();
                const auto newData = a_rhs.data();
 
                set_allocator_traits(newData, newCapacity);
                a_rhs.set_allocator_traits(0, 0);
 
                set_size(newSize);
                a_rhs.set_size(0);
            }
            return *this;
        }
 
        TES_HEAP_REDEFINE_NEW();
 
        [[nodiscard]] constexpr reference operator[](size_type a_pos) noexcept
        {
            assert(a_pos < size());
            return data()[a_pos];
        }
 
        [[nodiscard]] constexpr const_reference operator[](size_type a_pos) const noexcept
        {
            assert(a_pos < size());
            return data()[a_pos];
        }
 
        [[nodiscard]] constexpr reference       front() noexcept { return operator[](0); }
        [[nodiscard]] constexpr const_reference front() const noexcept { return operator[](0); }
 
        [[nodiscard]] constexpr reference       back() noexcept { return operator[](size() - 1); }
        [[nodiscard]] constexpr const_reference back() const noexcept { return operator[](size() - 1); }
 
        [[nodiscard]] constexpr pointer       data() noexcept { return static_cast<pointer>(allocator_type::data()); }
        [[nodiscard]] constexpr const_pointer data() const noexcept { return static_cast<const_pointer>(allocator_type::data()); }
 
        [[nodiscard]] constexpr iterator       begin() noexcept { return empty() ? nullptr : data(); }
        [[nodiscard]] constexpr const_iterator begin() const noexcept { return empty() ? nullptr : data(); }
        [[nodiscard]] constexpr const_iterator cbegin() const noexcept { return begin(); }
 
        [[nodiscard]] constexpr iterator       end() noexcept { return empty() ? nullptr : data() + size(); }
        [[nodiscard]] constexpr const_iterator end() const noexcept { return empty() ? nullptr : data() + size(); }
        [[nodiscard]] constexpr const_iterator cend() const noexcept { return end(); }
 
        [[nodiscard]] constexpr bool empty() const noexcept { return BSTArrayBase::empty(); }
 
        [[nodiscard]] constexpr size_type size() const noexcept { return BSTArrayBase::size(); }
 
        inline void reserve(size_type a_newCap)
        {
            if (a_newCap > capacity()) {
                change_capacity(a_newCap);
            }
        }
 
        [[nodiscard]] constexpr size_type capacity() const noexcept { return allocator_type::capacity(); }
 
        inline void shrink_to_fit()
        {
            const auto newCapacity = size();
            if (newCapacity != capacity()) {
                change_capacity(newCapacity);
            }
        }
 
        inline void clear()
        {
            if (!empty()) {
                change_size(0);
            }
        }
 
        inline iterator insert(const_iterator a_pos, const T& a_value)
        {
            return emplace(a_pos, a_value);
        }
 
        inline iterator insert(const_iterator a_pos, T&& a_value)
        {
            return emplace(a_pos, std::move(a_value));
        }
 
        template <class... Args>
        inline iterator emplace(const_iterator a_pos, Args&&... a_args)
        {
            if (a_pos == end()) {
                return std::addressof(emplace_back(std::forward<Args>(a_args)...));
            }
 
            const auto offset = a_pos - begin();
            const auto oldSize = size();
            const auto newSize = oldSize + 1;
 
            if (oldSize == capacity()) {
                const auto newCapacity = calculate_growth(newSize);
                const auto newData = allocate(newCapacity);
                const auto oldData = data();
                if (oldData) {
                    if (offset != 0) {
                        const auto bytesToCopy = offset * sizeof(value_type);
                        std::memcpy(newData, oldData, bytesToCopy);
                    }
                    const auto bytesToCopy = (oldSize - offset) * sizeof(value_type);
                    std::memcpy(newData + offset + 1, oldData + offset, bytesToCopy);
                    deallocate(oldData);
                }
                set_allocator_traits(newData, newCapacity);
            } else {
                const auto bytesToMove = (oldSize - offset) * sizeof(value_type);
                std::memmove(data() + offset + 1, data() + offset, bytesToMove);
            }
 
            set_size(newSize);
            auto& elem = data()[offset];
 
            std::construct_at(std::addressof(elem), std::forward<Args>(a_args)...);
            return std::addressof(elem);
        }
 
        inline iterator erase(const_iterator a_pos)
        {
            auto                    pos = const_cast<iterator>(a_pos);
            std::optional<iterator> result;
            if (pos != begin()) {
                result = pos - 1;
            }
 
            for (auto prev = pos++; pos != cend(); prev = pos++) {
                *prev = std::move(*pos);
            }
            pop_back();
 
            return result ? *result + 1 : begin();
        }
 
        inline void push_back(const value_type& a_value) { emplace_back(a_value); }
        inline void push_back(value_type&& a_value) { emplace_back(std::move(a_value)); }
 
        template <class... Args>
        inline reference emplace_back(Args&&... a_args)
        {
            if (size() == capacity()) {
                grow_capacity();
            }
 
            set_size(size() + 1);
            auto& elem = back();
            std::construct_at(std::addressof(elem), std::forward<Args>(a_args)...);
            return elem;
        }
 
        inline void pop_back()
        {
            assert(!empty());
            std::destroy_at(std::addressof(back()));
            set_size(size() - 1);
        }
 
        inline void resize(size_type a_count)
        {
            if (a_count != size()) {
                change_size(a_count);
            }
        }
 
        inline void resize(size_type a_count, const value_type& a_value)
        {
            if (a_count != size()) {
                change_size(a_count, a_value);
            }
        }
 
    private:
        static constexpr size_type DF_CAP = 4;           // beth default
        static constexpr float     GROWTH_FACTOR = 2.0;  // not part of native type
 
        [[nodiscard]] inline pointer allocate(size_type a_num)
        {
            return static_cast<pointer>(allocator_type::allocate(a_num * sizeof(value_type)));
        }
 
        inline void deallocate(void* a_ptr) { allocator_type::deallocate(a_ptr); }
 
        constexpr void set_allocator_traits(void* a_data, size_type a_capacity) noexcept
        {
            allocator_type::set_allocator_traits(a_data, a_capacity, sizeof(value_type));
        }
 
        constexpr void set_size(size_type a_size) noexcept { BSTArrayBase::set_size(a_size); }
 
        inline void change_capacity(size_type a_newCapacity)
        {
            const auto newData = a_newCapacity > 0 ? allocate(a_newCapacity) : nullptr;
            const auto oldData = data();
            if (oldData) {
                const auto oldCapacity = capacity();
                if (newData) {
                    const auto bytesToCopy = std::min(oldCapacity, a_newCapacity) * sizeof(value_type);
                    std::memcpy(newData, oldData, bytesToCopy);
                }
                deallocate(oldData);
            }
            set_allocator_traits(newData, a_newCapacity);
        }
 
        template <class... Args>
        inline void change_size(size_type a_newSize, Args&&... a_args)
        {
            if (a_newSize > capacity()) {
                grow_capacity(a_newSize);
            }
 
            const auto oldSize = size();
            if (a_newSize > oldSize) {
                for (size_type i = oldSize; i < a_newSize; ++i) {
                    std::construct_at(data() + i, std::forward<Args>(a_args)...);
                }
            } else {
                for (size_type i = a_newSize; i < oldSize; ++i) {
                    std::destroy_at(data() + i);
                }
            }
 
            set_size(a_newSize);
        }
 
        inline void grow_capacity() { grow_capacity(capacity()); }
 
        inline void grow_capacity(size_type a_hint)
        {
            const auto cap = calculate_growth(a_hint);
            change_capacity(cap);
        }
 
        [[nodiscard]] inline size_type calculate_growth(size_type a_hint)
        {
            return a_hint > 0 ? static_cast<size_type>(std::ceil(static_cast<float>(a_hint) * GROWTH_FACTOR)) : DF_CAP;
        }
 
        inline void release()
        {
            clear();
            change_capacity(0);
        }
    };
 
    template <class T, std::uint32_t N = 1>
    using BSTSmallArray = BSTArray<T, BSTSmallArrayHeapAllocator<sizeof(T) * N>>;
 
    template <class T>
    using BSScrapArray = BSTArray<T, BSScrapArrayAllocator>;
 
    template <class T>
    class BSStaticArray
    {
    public:
        using value_type = T;
        using size_type = std::uint32_t;
        using pointer = value_type*;
        using const_pointer = const value_type*;
        using reference = value_type&;
        using const_reference = const value_type&;
        using iterator = pointer;
        using const_iterator = const_pointer;
 
        [[nodiscard]] constexpr reference operator[](size_type a_pos) noexcept
        {
            assert(a_pos < _size);
            return _data[a_pos];
        }
 
        [[nodiscard]] constexpr const_reference operator[](size_type a_pos) const noexcept
        {
            assert(a_pos < _size);
            return _data[a_pos];
        }
 
        [[nodiscard]] constexpr reference       front() noexcept { return operator[](0); }
        [[nodiscard]] constexpr const_reference front() const noexcept { return operator[](0); }
 
        [[nodiscard]] constexpr reference       back() noexcept { return operator[](size() - 1); }
        [[nodiscard]] constexpr const_reference back() const noexcept { return operator[](size() - 1); }
 
        [[nodiscard]] constexpr pointer       data() noexcept { return _data; }
        [[nodiscard]] constexpr const_pointer data() const noexcept { return _data; }
 
        [[nodiscard]] constexpr iterator       begin() noexcept { return empty() ? nullptr : data(); }
        [[nodiscard]] constexpr const_iterator begin() const noexcept { return empty() ? nullptr : data(); }
        [[nodiscard]] constexpr const_iterator cbegin() const noexcept { return begin(); }
 
        [[nodiscard]] constexpr iterator       end() noexcept { return empty() ? nullptr : data() + size(); }
        [[nodiscard]] constexpr const_iterator end() const noexcept { return empty() ? nullptr : data() + size(); }
        [[nodiscard]] constexpr const_iterator cend() const noexcept { return end(); }
 
        [[nodiscard]] constexpr bool empty() const noexcept { return size() == 0; }
 
        [[nodiscard]] constexpr size_type size() const noexcept { return _size; }
 
    private:
        // members
        pointer       _data{ nullptr };  // 00
        std::uint32_t _size{ 0 };        // 08
    };
 
    template <class T>
    class BSTSmallSharedArray
    {
    public:
        using value_type = T;
        using size_type = std::uint32_t;
        using pointer = value_type*;
        using const_pointer = const value_type*;
        using reference = value_type&;
        using const_reference = const value_type&;
        using iterator = pointer;
        using const_iterator = const_pointer;
 
        [[nodiscard]] inline reference operator[](size_type a_pos) noexcept
        {
            assert(a_pos < _size);
            return data()[a_pos];
        }
 
        [[nodiscard]] inline const_reference operator[](size_type a_pos) const noexcept
        {
            assert(a_pos < _size);
            return data()[a_pos];
        }
 
        [[nodiscard]] inline pointer data() noexcept
        {
            return size() > 1 ? _data.heap : std::addressof(_data.local);
        }
 
        [[nodiscard]] inline const_pointer data() const noexcept
        {
            return size() > 1 ? _data.heap : std::addressof(_data.local);
        }
 
        [[nodiscard]] inline iterator       begin() noexcept { return data(); }
        [[nodiscard]] inline const_iterator begin() const noexcept { return data(); }
        [[nodiscard]] inline const_iterator cbegin() const noexcept { return begin(); }
 
        [[nodiscard]] inline iterator       end() noexcept { return data() + size(); }
        [[nodiscard]] inline const_iterator end() const noexcept { return data() + size(); }
        [[nodiscard]] inline const_iterator cend() const noexcept { return end(); }
 
        [[nodiscard]] constexpr bool empty() const noexcept { return size() != 0; }
 
        [[nodiscard]] constexpr size_type size() const noexcept { return _size; }
 
    private:
        union Data
        {
            ~Data(){};
 
            pointer    heap{ 0 };
            value_type local;
        };
 
        // members
        std::uint32_t _size{ 0 };  // 00
        Data          _data;       // 08
    };
}