hkArray.h

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#pragma once
 
#include "RE/H/hkContainerAllocators.h"
 
namespace RE
{
    template <class T>
    class hkArrayBase
    {
    public:
        using value_type = T;
        using size_type = std::int32_t;
        using reference = value_type&;
        using const_reference = const value_type&;
        using iterator = T*;
        using const_iterator = const T*;
 
        reference operator[](size_type a_pos)
        {
            assert(a_pos >= 0 && a_pos < size());
            return data()[a_pos];
        }
 
        const_reference operator[](size_type a_pos) const
        {
            assert(a_pos >= 0 && a_pos < size());
            return data()[a_pos];
        }
 
        T* data()
        {
            return _data;
        }
 
        [[nodiscard]] const T* data() const
        {
            return _data;
        }
 
        reference front()
        {
            return operator[](0);
        }
 
        [[nodiscard]] const_reference front() const
        {
            return operator[](0);
        }
 
        reference back()
        {
            return operator[](size() - 1);
        }
 
        [[nodiscard]] const_reference back() const
        {
            return operator[](size() - 1);
        }
 
        iterator begin()
        {
            return empty() ? iterator{} : std::addressof(data()[0]);
        }
 
        [[nodiscard]] const_iterator begin() const
        {
            return empty() ? const_iterator{} : std::addressof(data()[0]);
        }
 
        [[nodiscard]] const_iterator cbegin() const
        {
            return begin();
        }
 
        iterator end()
        {
            return empty() ? iterator{} : std::addressof(data()[size()]);
        }
 
        [[nodiscard]] const_iterator end() const
        {
            return empty() ? const_iterator{} : std::addressof(data()[size()]);
        }
 
        [[nodiscard]] const_iterator cend() const
        {
            return end();
        }
 
        [[nodiscard]] bool empty() const
        {
            return size() == 0;
        }
 
        [[nodiscard]] size_type size() const noexcept
        {
            return _size;
        }
 
        void reserve(size_type a_newCap)
        {
            assert(a_newCap <= kCapacityMask);
            if (a_newCap <= capacity()) {
                return;
            }
 
            auto      allocator = hkContainerHeapAllocator::GetSingleton();
            size_type newSize = a_newCap * sizeof(T);
            T*        newMem = static_cast<T*>(allocator->BufAlloc(newSize));
            if (_data) {
                size_type oldSize = size() * sizeof(T);
                std::memcpy(newMem, _data, oldSize);
                if ((_capacityAndFlags & kDontDeallocFlag) == 0) {
                    allocator->BufFree(_data, oldSize);
                }
            }
 
            _data = newMem;
            _capacityAndFlags &= ~kCapacityMask;
            _capacityAndFlags |= a_newCap & kCapacityMask;
        }
 
        [[nodiscard]] size_type capacity() const noexcept
        {
            return _capacityAndFlags & kCapacityMask;
        }
 
        void push_back(const T& a_value)
        {
            if (size() == capacity()) {
                reserve(static_cast<size_type>(std::ceil(size() * GROWTH_FACTOR)));
            }
            _data[_size++] = a_value;
        }
 
        void resize(size_type a_count)
        {
            assert(a_count > 0 && a_count <= kCapacityMask);
            if (a_count == size()) {
                return;
            }
 
            if (a_count < size()) {  // if shrink
                for (size_type i = a_count; i < size(); ++i) {
                    _data[i].~T();
                }
            }
 
            auto      allocator = hkContainerHeapAllocator::GetSingleton();
            size_type newSize = a_count * sizeof(T);
            T*        newMem = static_cast<T*>(allocator->BufAlloc(newSize));
            if (_data) {
                size_type oldSize = size() * sizeof(T);
                std::memcpy(newMem, _data, (std::min)(oldSize, newSize));
                if ((_capacityAndFlags & kDontDeallocFlag) == 0) {
                    allocator->BufFree(_data, oldSize);
                }
            }
 
            if (a_count > size()) {  // if grow
                for (size_type i = size(); i < a_count; ++i) {
                    new (&newMem[i]) T{};
                }
            }
 
            _data = newMem;
            _size = a_count;
            _capacityAndFlags &= ~kCapacityMask;
            _capacityAndFlags |= a_count & kCapacityMask;
        }
 
        enum : std::uint32_t
        {
            kCapacityMask = 0x3FFFFFFF,
            kFlagMask = 0xC0000000,
            kDontDeallocFlag = (std::uint32_t)1 << 31
        };
 
        static constexpr float GROWTH_FACTOR = 1.5;  // NOT PART OF NATIVE TYPE
 
        T*           _data;              // 00
        std::int32_t _size;              // 08
        std::int32_t _capacityAndFlags;  // 0C
    };
    static_assert(sizeof(hkArrayBase<void*>) == 0x10);
 
    template <class T, class Allocator = void>
    class hkArray : public hkArrayBase<T>
    {
    public:
    };
    static_assert(sizeof(hkArray<void*>) == 0x10);
 
    template <class T, std::size_t N, class Allocator = void>
    class hkInplaceArray : public hkArray<T, Allocator>
    {
    public:
        T storage[N];  // 10
    };
}