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#include <algorithm>
#include <bobcat/refcount>

namespace FBB
{

template<typename Data>
class AutoPtr
{
    class RefData: public RefCount
    {
        Data *d_data;
        size_t d_size;      // 0: single pointer, otherwise array

        public:
            RefData();
            RefData(Data *d_data, size_t size);
            RefData(RefData const &other) = delete;

            virtual ~RefData();

            Data *get(int idx);
            Data *releaseOne();                     // Return one allocated
                                                    // copy, lose share count
            Data *releaseAll();                     // Return allocated data
                                                    // lose all shares
            void reset(Data *data, size_t size = 0);// reset to data[size]
                                                    // or data if size == 0
        private:
            virtual RefCount *clone() const;
            void destroy();
    };

    RefData *d_data;
    int d_base;         // base is used with arrays. It provides a base 
                        // location from where index operations start to
                        // count. 

    public:
        AutoPtr();                      // Default constructor

        explicit AutoPtr(Data *data);   // Receive one allocated Data element

        AutoPtr(Data *data, size_t size);   // Array of n Data elements
        AutoPtr(AutoPtr &other);            // Copy constructor
        AutoPtr(AutoPtr &&other);           // Move constructor

        ~AutoPtr();

        AutoPtr &operator=(AutoPtr &other);

        Data &operator*();

        Data *operator->();
        Data *get();                    // same as operator->

        Data *release();                // lose one reference count
        Data *releaseAll();             // lose all references

        void reset(Data *data, size_t size = 0);    // lose one reference, 
                                                    // reassign data[size] or
                                                    // data if size == 0

        void resetAll(Data *data, size_t size = 0); // new data[size] or data
                                                    // if size == 0
        Data &operator[](int idx);

        AutoPtr &operator+=(int idx);
        AutoPtr &operator-=(int idx);
        AutoPtr operator+(int idx);
        AutoPtr operator-(int idx);

    private:
        void destroy();
        void copy(AutoPtr &other);    
};

// RefData members:

template<typename Data>
AutoPtr<Data>::RefData::RefData()
:
    d_data(0),
    d_size(0)
{}

template<typename Data>
AutoPtr<Data>::RefData::RefData(Data *data, size_t size)
:
    d_data(data),
    d_size(size)
{}

template<typename Data>
inline AutoPtr<Data>::RefData::~RefData()
{
    destroy();
}

template<typename Data>
RefCount *AutoPtr<Data>::RefData::clone() const
{
    Data *data;

    if (!d_size)
        data = new Data(*d_data);
    else
    {
        data = new Data[d_size];
        std::copy(d_data, d_data + d_size, data);
    }

    return new RefData(d_data, d_size);
}

template<typename Data>
inline Data *AutoPtr<Data>::RefData::get(int idx)
{
    return d_data + idx;
}

template<typename Data>
Data *AutoPtr<Data>::RefData::releaseOne()
{
    Data *ret;
    if (refcount() == 1)
    {
        ret = d_data;
        d_data = 0;
    }
    else
    {
        if (!d_size)
            ret = new Data(*d_data);
        else
        {
            ret = new Data[d_size];
            for (size_t idx = 0; idx < d_size; ++idx)
                ret[idx] = d_data[idx];
        }
    }
    release();
    return ret;
}

template<typename Data>
Data *AutoPtr<Data>::RefData::releaseAll()
{
    Data *ret = d_data;
    d_data = 0;
    release();

    return ret;
}

template<typename Data>
void AutoPtr<Data>::RefData::reset(Data *data, size_t size)
{
    destroy();
    d_data = data;
    d_size = size;
}

template<typename Data>
void AutoPtr<Data>::RefData::destroy()
{
    if (d_size == 0)
        delete d_data;
    else
        delete [] d_data;       // maybe add facility for double pointers, 
                                // which will delete the individual data 
                                // elements?
}

// AutoPtr members

template<typename Data>         // Default constructor
AutoPtr<Data>::AutoPtr()
:
    d_data(new RefData()),
    d_base(0)
{}

template<typename Data>         // One data element
AutoPtr<Data>::AutoPtr(Data *data)
:
    d_data(new RefData(data, 0)),
    d_base(0)
{}

template<typename Data>         // Array of `size' data elements
AutoPtr<Data>::AutoPtr(Data *data, size_t size)
:
    d_data(new RefData(data, size)),
    d_base(0)
{}

template<typename Data>         // Copy constructor
inline AutoPtr<Data>::AutoPtr(AutoPtr &other)
{
    copy(other);
}

template<typename Data>         // Move constructor
inline AutoPtr<Data>::AutoPtr(AutoPtr &&tmp)
:
    d_data(tmp.d_datao),
    d_base(tmp.d_base)
{
    tmp.d_data = 0;
}

template<typename Data>         // destructor
inline AutoPtr<Data>::~AutoPtr()
{
    if (d_data)
        destroy();
}

template<typename Data>         // Assignment operator
AutoPtr<Data> &AutoPtr<Data>::operator=(AutoPtr &other)
{
    if (this != &other)
    {
        destroy();
        copy(other);
    }
    return *this;
}

template<typename Data>         // Dereference operator
inline Data &AutoPtr<Data>::operator*()
{
    return *d_data->get(d_base);
}


template<typename Data>         // Pointer operator
inline Data *AutoPtr<Data>::operator->()
{
    return d_data->get(d_base);
}

template<typename Data>         // get() member
inline Data *AutoPtr<Data>::get()
{
    return d_data->get(d_base);
}

template<typename Data>         // lose one share count, return alloc. copy
inline Data *AutoPtr<Data>::release()
{
    return d_data->releaseOne();
}

template<typename Data>         // lose all shares, return alloc. data
inline Data *AutoPtr<Data>::releaseAll()
{
    return d_data->releaseAll();
}

template<typename Data>         // lose one share count, point to alloc. copy
void AutoPtr<Data>::reset(Data *data, size_t size)
{
    d_data->release();
    d_data = new RefData(data, size);
    d_base = 0;
}

template<typename Data>         // redefine data for all sharing objects
void AutoPtr<Data>::resetAll(Data *data, size_t size)
{
    d_data->reset(data, size);
    d_base = 0;
}


template<typename Data>
void AutoPtr<Data>::copy(AutoPtr &other)
{
    d_data = RefData::share(other.d_data);
    d_base = other.d_base;
}

template<typename Data>
inline void AutoPtr<Data>::destroy()
{
    d_data->release();
}

template<typename Data>
inline Data &AutoPtr<Data>::operator[](int idx)
{
    return *d_data->get(d_base + idx);
}

template<typename Data>
AutoPtr<Data> &AutoPtr<Data>::operator+=(int idx)
{
    d_base += idx;
    return *this;
}

template<typename Data>
inline AutoPtr<Data> AutoPtr<Data>::operator+(int idx)
{
    return AutoPtr<Data>(*this) += idx;
}

template<typename Data>
inline AutoPtr<Data> operator+(int idx, AutoPtr<Data> &rhs)
{
    return AutoPtr<Data>(rhs) += idx;
}

template<typename Data>
inline AutoPtr<Data> &AutoPtr<Data>::operator-=(int idx)
{
    return *this += -idx;
}

template<typename Data>
inline AutoPtr<Data> AutoPtr<Data>::operator-(int idx)
{
    return AutoPtr<Data>(*this) -= idx;
}

} // FBB