ReferenceCount.h

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//Luke Lenhart (2008)
//See /docs/License.txt for details on how this code may be used.

#ifndef REFERENCECOUNT_H_INCLUDED
#define REFERENCECOUNT_H_INCLUDED

#include "Types.h"

namespace MPMA
{
    template <typename DataType>
    class ReferenceCountedData
    {
    public:
        ReferenceCountedData();

        virtual ~ReferenceCountedData();

        ReferenceCountedData(const ReferenceCountedData &other);
        ReferenceCountedData& operator=(const ReferenceCountedData &other);

        inline bool SharesDataWith(const ReferenceCountedData<DataType> &o)
            { return referencedData==o.referencedData; }

    protected:
        inline DataType& Data()
            { return referencedData->data; }
        inline const DataType& Data() const
            { return referencedData->data; }

        inline nuint ReferenceCount() const
            { return referencedData->count; }

        inline bool IsOnlyReference() const
            { return ReferenceCount()==1; }

        void CreateNewData();

    private:
        struct ReferencedData
        {
                        volatile nuint count;
            DataType data;
        };

        ReferencedData *referencedData;

        //releases a reference and frees the data if needed
        void ReleaseReference();
    };
}

//include template and inline implementations
#ifndef REFERENCECOUNT_INCLUDE_INLINE
    #define REFERENCECOUNT_INCLUDE_INLINE
    #include "ReferenceCount.cpp"
#endif

#endif //REFERENCECOUNT_H_INCLUDED