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#ifndef __HMESH_VERTEXCIRCULATOR_H__
#define __HMESH_VERTEXCIRCULATOR_H__

#include "HalfEdgeHandle.h"

namespace HMesh
{
    // forward declaration
    class VertexHandle;
    class FaceHandle;

    class VertexCirculator
    {
    public:
        /// Construct circulator from vertex handle
        VertexCirculator(const VertexHandle& v);
        /// Construct circulator from halfedge handle
        VertexCirculator(const HalfEdgeHandle& h);

        /// Get current halfedge
            HalfEdgeHandle halfedge() const;
        /// Get opposite halfedge of the current halfedge, i.e. the one pointing towards us.
                HalfEdgeHandle opp_halfedge() const;
        /// Get vertex pointed to by current halfedge
        VertexHandle vertex() const;
        /// Get the face of the current halfedge.
                FaceHandle face() const;

        /// Prefix increment
        void operator++();
        /// Postfix increment
        void operator++(int);

        /// Has circulator come full circle?
                bool end();

        /// Number of steps = valency.
                size_t no_steps();
    private:
        /// The last halfedge in circle
        HalfEdgeHandle last;
        /// Current halfedge in circle
        HalfEdgeHandle he;
        /// Steps taken in circle
        size_t steps;
    };

}

#endif __HMESH_VERTEXCIRCULATOR_H__