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1 phase, coordinate enumerated neighbourhood operation with two extra images

Pseudo code of the operation:

NeighbourhoodOp(Dst, Src, Ext, Ext2, Ngb)
{
    foreach d, s, e, e2 in Dst, Src, Ext, Ext2 {
        Ngb.init(s.x, s.y, Src(s), Ext(e), Ext2(e2));
        foreach n in Ngb.begin() .. Ngb.end()
            Ngb.next(n.x, n.y, Src(s + n), Ext(e + n), Ext2(e2 + n));
        Dst(d) = ngb.result();
    }
}

The requirements on the NgbT template parameter expressed as class definition are:

template<class DstValT, class SrcValT, class ExtValT, class Ext2ValT>
class NgbT
{
public:

    typedef HxTagCnum       IteratorCategory;
    typedef HxTag1Phase     PhaseCategory;

    typedef HxCnum              CnumType;

                      NgbT(HxTagList& tags);
                      ~NgbT();

    HxSizes           size();

    CnumType          begin();
    CnumType          end();

    void              init(int ix, int iy, SrcValT v1, ExtValT v2, Ext2ValT v3);
    void              next(int nx, int ny, SrcValT v1, ExtValT v2, Ext2ValT v3);
    DstValT           result() const;

    static HxString   className();
};

The Requirements on CnumType expressed as a class definition are:

class CnumType
{
public:
                                CnumType();
                                CnumType(const CnumType& rhs);
    CnumType&                   operator=(const CnumType& rhs);
    int                         x();
    int                         y();
    int                         z();
    void                        inc();
    bool                        operator!=(const CnumType& rhs);
};

Example(s):

• instantiation : <none>, usage : <none>

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Return to patterns.

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