NearestNeighbor.h

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#ifndef GfxTL__NEARESTNEIGHBOR_HEADER__
#define GfxTL__NEARESTNEIGHBOR_HEADER__
 
namespace GfxTL
{
 
    template< class ScalarT, class IndexT = size_t >
    struct NN
    {
        typedef ScalarT ScalarType;
        typedef IndexT IndexType;
        ScalarType sqrDist;
        IndexType index;
        NN() {}
        NN(ScalarType d, IndexType i)
            : sqrDist(d)
            , index(i)
        {}
        bool operator<(const NN& nn) const
        {
            return sqrDist < nn.sqrDist;
        }
        bool operator>(const NN& nn) const
        {
            return sqrDist > nn.sqrDist;
        }
        bool operator<=(const NN& nn) const
        {
            return sqrDist <= nn.sqrDist;
        }
        bool operator>=(const NN& nn) const
        {
            return sqrDist >= nn.sqrDist;
        }
        bool operator==(const NN& nn) const
        {
            return sqrDist == nn.sqrDist && index == nn.index;
        }
        bool operator!=(const NN& nn) const
        {
            return sqrDist != nn.sqrDist || index != nn.index;
        }
        operator IndexType() const
        {
            return index;
        }
        operator IndexType& ()
        {
            return index;
        }
        operator ScalarType() const
        {
            return sqrDist;
        }
    };
 
};
 
#endif