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[cnng0315 <>]

I would like to add some extra info to point, so I derived from CGAL::Point_2
like the code below. but with the custom point, the snap_rounding algorithm
gives error result compared with the standard point.

        template<class Gt,typename Info>
        class Point_With_Info : public Gt::Point_2
        {
                // Private types
        private:

                typedef typename Gt::Point_2  Base;

                // Public types
        public:

                typedef Gt Geom_traits; ///< Geometric traits class
                typedef typename Geom_traits::FT FT;
                typedef typename Geom_traits::RT RT;
                typedef typename Geom_traits::Point_2  Point;  ///< typedef to
Geom_traits::Point_3

                // Public methods
        public:

                /// Point is (0,0,0) by default.
                /// Normal is (0,0,0) by default.
                Point_With_Info()
                        : Base()
                {
                }
                Point_With_Info(FT x, FT y)
                        : Base(x,y)
                {
                }
                Point_With_Info(FT x, FT y,const Info& tmp)
                        : Base(x,y),info(tmp)
                {
                }
                //Point_With_Info(RT hx, RT hy)
                //      : Base(hx,hy)
                //{
                //}
                Point_With_Info(const Point& point,const Info& tmp)
                        : Base(point),info(tmp)
                {
                }
                Point_With_Info(const Point& point)
                        : Base(point)
                {
                }

                /// Copy constructor
                Point_With_Info(const Point_With_Info& pwn)
                        : Base(pwn),info(pwn.info)
                {
                }
                template <class K,typename Info>
                Point_With_Info(const Point_With_Info<K,Info>& pwn)
                        : Base(pwn),info(pwn.info)
                {
                }
                /// Operator =()
                Point_With_Info& operator=(const Point_With_Info& pwn)
                {
                        Base::operator=(pwn);
                        info = pwn.info;
                        return *this;
                }

                /// Gets/sets position.
                const Point& position() const { return *this; }
                Point&       position()       { return *this; }
                // Data
                        
                Info info;
        };


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