/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/JetMETCorrections/InterpolationTables/interface/ArrayNDScanner.h

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#ifndef NPSTAT_ARRAYNDSCANNER_HH_
#define NPSTAT_ARRAYNDSCANNER_HH_

#include <vector>
#include <climits>

namespace npstat {
    class ArrayNDScanner
    {
    public:

        inline ArrayNDScanner(const unsigned* shape, const unsigned lenShape)
            {initialize(shape, lenShape);}

        inline ArrayNDScanner(const std::vector<unsigned>& shape)
            {initialize(shape.empty() ? static_cast<unsigned*>(0) : 
                        &shape[0], shape.size());}

        inline unsigned dim() const {return dim_;}

        inline unsigned long state() const {return state_;}

        inline unsigned long maxState() const {return maxState_;}

        inline bool isValid() const {return state_ < maxState_;}

        void getIndex(unsigned* index, unsigned indexBufferLen) const;

        inline void reset() {state_ = 0UL;}

        inline ArrayNDScanner& operator++()
            {if (state_ < maxState_) ++state_; return *this;}

        inline void operator++(int) {if (state_ < maxState_) ++state_;}

        inline void setState(const unsigned long state)
            {state_ = state <= maxState_ ? state : maxState_;}

    private:
        ArrayNDScanner();
        
        void initialize(const unsigned* shape, unsigned lenShape);

        unsigned long strides_[CHAR_BIT*sizeof(unsigned long)];
        unsigned long state_;
        unsigned long maxState_;
        unsigned dim_;
    };
}

#endif // NPSTAT_ARRAYSCANNER_HH_