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namespace HMesh
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namespace HMesh
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{
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{
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    class HalfEdgeWalker
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    class HalfEdgeWalker
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    {
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    {
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    public:
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    public:
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        /// construct from kernel and a halfedge
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        HalfEdgeWalker(const ConnectivityKernel& _ck, HalfEdgeID _current);
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        HalfEdgeWalker(const ConnectivityKernel& _ck, HalfEdgeID _current);
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        /// returned walker has made one step to the next halfedge
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        HalfEdgeWalker next() const;
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        HalfEdgeWalker next() const;
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        /// returned walker has made one step to the previous halfedge
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        HalfEdgeWalker prev() const;
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        HalfEdgeWalker prev() const;
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        /// returned walker has made one step to the opposite halfedge
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        HalfEdgeWalker opp() const;
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        HalfEdgeWalker opp() const;
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        /// returned walker has circulated vertex clockwise one step
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        HalfEdgeWalker circulate_vertex_cw() const;
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        HalfEdgeWalker circulate_vertex_cw() const;
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        /// returned walker has circulated vertex counterclockwise one step
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        HalfEdgeWalker circulate_vertex_ccw() const;
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        HalfEdgeWalker circulate_vertex_ccw() const;
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        /// returned walker has circulated face clockwise one step
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        HalfEdgeWalker circulate_face_cw() const;
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        HalfEdgeWalker circulate_face_cw() const;
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        /// returned walker has circulated face counterclockwise one step
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        HalfEdgeWalker circulate_face_ccw() const;
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        HalfEdgeWalker circulate_face_ccw() const;
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        /// test if the walker has reached its initial halfedge
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        bool full_circle() const;
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        bool full_circle() const;
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        /// number of steps taken
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        int no_steps() const;
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        int no_steps() const;
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        /// get ID of vertex pointed to by current halfedge of walker
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        VertexID vertex() const;
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        VertexID vertex() const;
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        /// get ID of face owning current halfedge of walker
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        FaceID face() const;
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        FaceID face() const;
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        /// get ID of current halfedge of walker
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        HalfEdgeID halfedge() const;
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        HalfEdgeID halfedge() const;
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        /// assignment operator
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        HalfEdgeWalker operator =(const HalfEdgeWalker& w);
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        HalfEdgeWalker operator =(const HalfEdgeWalker& w);
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    private:
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    private:
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        const ConnectivityKernel* ck;
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        const ConnectivityKernel* ck;
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        HalfEdgeID last;
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        HalfEdgeID last;