PolyVoxCore/include/PolyVoxCore/Array.inl

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Copyright (c) 2005-2009 David Williams

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Permission is granted to anyone to use this software for any purpose,
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*******************************************************************************/

namespace PolyVox
{
    template <uint32_t noOfDims, typename ElementType>
    Array<noOfDims, ElementType>::Array()
        :m_pDimensions(0)
        ,m_pOffsets(0)
        ,m_uNoOfElements(0)
        ,m_pElements(0)
    {
    }

    template <uint32_t noOfDims, typename ElementType>
    Array<noOfDims, ElementType>::Array(const uint32_t (&pDimensions)[noOfDims])
        :m_pDimensions(0)
        ,m_pOffsets(0)
        ,m_uNoOfElements(0)
        ,m_pElements(0)
    {
        resize(pDimensions);
    }

    template <uint32_t noOfDims, typename ElementType>
    Array<noOfDims, ElementType>::~Array()
    {
        deallocate();
    }

    template <uint32_t noOfDims, typename ElementType>
    SubArray<noOfDims-1, ElementType> Array<noOfDims, ElementType>::operator[](uint32_t uIndex)
    {
        assert(uIndex<m_pDimensions[0]);
        return
            SubArray<noOfDims-1, ElementType>(&m_pElements[uIndex*m_pOffsets[0]],
            m_pDimensions+1, m_pOffsets+1);
    }

    template <uint32_t noOfDims, typename ElementType>
    const SubArray<noOfDims-1, ElementType> Array<noOfDims, ElementType>::operator[](uint32_t uIndex) const
    {
        assert(uIndex<m_pDimensions[0]);
        return
            SubArray<noOfDims-1, ElementType>(&m_pElements[uIndex*m_pOffsets[0]],
            m_pDimensions+1, m_pOffsets+1);
    }

    template <uint32_t noOfDims, typename ElementType>
    uint32_t Array<noOfDims, ElementType>::getNoOfElements(void) const
    {
        return m_uNoOfElements;
    }

    template <uint32_t noOfDims, typename ElementType>
    ElementType* Array<noOfDims, ElementType>::getRawData(void) const
    {
        return m_pElements;
    }

    template <uint32_t noOfDims, typename ElementType>
    void Array<noOfDims, ElementType>::resize(const uint32_t (&pDimensions)[noOfDims])
    {
        deallocate();

        m_pDimensions = new uint32_t[noOfDims];
        m_pOffsets = new uint32_t[noOfDims];

        // Calculate all the information you need to use the array
        m_uNoOfElements = 1;
        for (uint32_t i = 0; i<noOfDims; i++)
        {
            assert(pDimensions[i] != 0);

            m_uNoOfElements *= pDimensions[i];
            m_pDimensions[i] = pDimensions[i];
            m_pOffsets[i] = 1;
            for (uint32_t k=noOfDims-1; k>i; k--)
            {
                m_pOffsets[i] *= pDimensions[k];
            }
        }
        // Allocate new elements, let exception propagate
        m_pElements = new ElementType[m_uNoOfElements];
    }

    template <uint32_t noOfDims, typename ElementType>
    void Array<noOfDims, ElementType>::swap(Array<noOfDims, ElementType>& rhs)
    {
        //Implement this function without temporary 'Array'
        //objects, as the destructors will free the memory...
        uint32_t* m_pTempDimensions = m_pDimensions;
        uint32_t* m_pTempOffsets = m_pOffsets;
        uint32_t m_uTempNoOfElements = m_uNoOfElements;
        ElementType* m_pTempElements = m_pElements;

        m_pDimensions = rhs.m_pDimensions;
        m_pOffsets = rhs.m_pOffsets;
        m_uNoOfElements = rhs.m_uNoOfElements;
        m_pElements = rhs.m_pElements;

        rhs.m_pDimensions = m_pTempDimensions;
        rhs.m_pOffsets = m_pTempOffsets;
        rhs.m_uNoOfElements = m_uTempNoOfElements;
        rhs.m_pElements = m_pTempElements;
    }

    template <uint32_t noOfDims, typename ElementType>
    uint32_t Array<noOfDims, ElementType>::getDimension(uint32_t uDimension)
    {
        assert(uDimension < noOfDims);
        return m_pDimensions[uDimension];
    }

    template <uint32_t noOfDims, typename ElementType>
    Array<noOfDims, ElementType>::Array(const Array<noOfDims, ElementType>& rhs)
        :m_pElements(0)
        ,m_pDimensions(0)
        ,m_pOffsets(0)
        ,m_uNoOfElements(0)
    {
        //Not implemented
        assert(false);
    }

    template <uint32_t noOfDims, typename ElementType>
    Array<noOfDims, ElementType>& Array<noOfDims, ElementType>::operator=(const Array<noOfDims, ElementType>& rhs)
    {
        //Not implemented
        assert(false);

        return *this;
    }

    template <uint32_t noOfDims, typename ElementType>
    void Array<noOfDims, ElementType>::deallocate(void)
    {
        delete[] m_pDimensions;
        m_pDimensions = 0;
        delete[] m_pOffsets;
        m_pOffsets = 0;
        delete[] m_pElements;
        m_pElements = 0;

        m_uNoOfElements = 0;
    }

    //****************************************************************************//
    // One dimensional specialisation begins here                                 //
    //****************************************************************************//

    template <typename ElementType>
    Array<1, ElementType>::Array()
        : m_pElements(0)
        ,m_pDimensions(0)
    {
    }

    template <typename ElementType>
    Array<1, ElementType>::Array(const uint32_t (&pDimensions)[1])
        : m_pElements(0)
        ,m_pDimensions(0)
    {
        resize(pDimensions);
    }

    template <typename ElementType>
    Array<1, ElementType>::~Array()
    {
        deallocate();
    }

    template <typename ElementType>
    ElementType& Array<1, ElementType>::operator[] (uint32_t uIndex)
    {
        assert(uIndex<m_pDimensions[0]);
        return m_pElements[uIndex];
    }

    template <typename ElementType>
    const ElementType& Array<1, ElementType>::operator[] (uint32_t uIndex) const
    {
        assert(uIndex<m_pDimensions[0]);
        return m_pElements[uIndex];
    }

    template <typename ElementType>
    uint32_t Array<1, ElementType>::getNoOfElements(void) const
    {
        return m_pDimensions[0];
    }

    template <typename ElementType>
    ElementType* Array<1, ElementType>::getRawData(void) const
    {
        return m_pElements;
    }

    template <typename ElementType>
    void Array<1, ElementType>::resize(const uint32_t (&pDimensions)[1])
    {
        deallocate();

        m_pDimensions = new uint32_t[1];
        m_pDimensions[0] = pDimensions[0];

        // Allocate new elements, let exception propagate
        m_pElements = new ElementType[m_pDimensions[0]];
    }

    template <typename ElementType>
    void Array<1, ElementType>::swap(Array<1, ElementType>& rhs)
    {
        //Implement this function without temporary 'Array'
        //objects, as the destructors will free the memory...
        uint32_t* m_pTempDimensions = m_pDimensions;
        ElementType* m_pTempElements = m_pElements;

        m_pDimensions = rhs.m_pDimensions;
        m_pElements = rhs.m_pElements;

        rhs.m_pDimensions = m_pTempDimensions;
        rhs.m_pElements = m_pTempElements;
    }

    template <typename ElementType>
    Array<1, ElementType>::Array(const Array<1, ElementType>& rhs)
        : m_pElements(0)
        ,m_pDimensions(0)
    {
        //Not implemented
        assert(false);
    }

    template <typename ElementType>
    Array<1, ElementType>& Array<1, ElementType>::operator=(const Array<1, ElementType>& rhs)
    {
        //Not implemented
        assert(false);

        return *this;
    }

    template <typename ElementType>
    void Array<1, ElementType>::deallocate(void)
    {
        delete[] m_pDimensions;
        m_pDimensions = 0;
        delete[] m_pElements;
        m_pElements = 0;
    }
}//namespace PolyVox