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/*===========================================================================*\
 *                                                                           *
 *                               OpenMesh                                    *
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 *      Copyright (C) 2001-2010 by Computer Graphics Group, RWTH Aachen      *
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 *                           www.openmesh.org                                *
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 *---------------------------------------------------------------------------* 
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 *  This file is part of OpenMesh.                                           *
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 *  If other files instantiate templates or use macros                       *
 *  or inline functions from this file, or you compile this file and         *
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/*===========================================================================*\
 *                                                                           *             
 *   $Revision$                                                         *
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 *                                                                           *
\*===========================================================================*/
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#ifndef OPENMESH_CIRCULATORS_HH
#define OPENMESH_CIRCULATORS_HH
//=============================================================================
//
//  Vertex and Face circulators for PolyMesh/TriMesh
//
//=============================================================================



//== INCLUDES =================================================================

#include <OpenMesh/Core/System/config.h>
#include <assert.h>


//== NAMESPACES ===============================================================

namespace OpenMesh {
namespace Iterators {


//== FORWARD DECLARATIONS =====================================================


template <class Mesh> class VertexVertexIterT;
template <class Mesh> class VertexIHalfedgeIterT;
template <class Mesh> class VertexOHalfedgeIterT;
template <class Mesh> class VertexEdgeIterT;
template <class Mesh> class VertexFaceIterT;

template <class Mesh> class ConstVertexVertexIterT;
template <class Mesh> class ConstVertexIHalfedgeIterT;
template <class Mesh> class ConstVertexOHalfedgeIterT;
template <class Mesh> class ConstVertexEdgeIterT;
template <class Mesh> class ConstVertexFaceIterT;

template <class Mesh> class FaceVertexIterT;
template <class Mesh> class FaceHalfedgeIterT;
template <class Mesh> class FaceEdgeIterT;
template <class Mesh> class FaceFaceIterT;

template <class Mesh> class ConstFaceVertexIterT;
template <class Mesh> class ConstFaceHalfedgeIterT;
template <class Mesh> class ConstFaceEdgeIterT;
template <class Mesh> class ConstFaceFaceIterT;



//== CLASS DEFINITION =========================================================

	      
/** \class VertexVertexIterT CirculatorsT.hh <OpenMesh/Mesh/Iterators/CirculatorsT.hh>
    Circulator.
*/

template <class Mesh>
class VertexVertexIterT
{
 public:


  //--- Typedefs ---

  typedef typename Mesh::HalfedgeHandle   HalfedgeHandle;

  typedef typename Mesh::Vertex           value_type;
  typedef typename Mesh::VertexHandle         value_handle;

#if 0
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  typedef std::bidirectional_iterator_tag   iterator_category;
  typedef ptrdiff_t                         difference_type;
  typedef const Mesh&                       mesh_ref;
  typedef const Mesh*                       mesh_ptr;
  typedef const typename Mesh::Vertex&      reference;
  typedef const typename Mesh::Vertex*      pointer;
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#else
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  typedef std::bidirectional_iterator_tag   iterator_category;
  typedef ptrdiff_t                         difference_type;
  typedef Mesh&                             mesh_ref;
  typedef Mesh*                             mesh_ptr;
  typedef typename Mesh::Vertex&            reference;
  typedef typename Mesh::Vertex*            pointer;
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#endif



  /// Default constructor
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  VertexVertexIterT() : mesh_(0), lap_counter_(0) {}
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  /// Construct with mesh and a typename Mesh::VertexHandle
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  VertexVertexIterT(mesh_ref _mesh, typename Mesh::VertexHandle _start, bool _end = false) :
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    mesh_(&_mesh), 
    start_(_mesh.halfedge_handle(_start)),
    heh_(start_),
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    lap_counter_(_end)
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  {  ; }


  /// Construct with mesh and start halfedge
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  VertexVertexIterT(mesh_ref _mesh, HalfedgeHandle _heh, bool _end = false) :
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    mesh_(&_mesh),
    start_(_heh),
    heh_(_heh),
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    lap_counter_(_end)
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  {  ; }


  /// Copy constructor
  VertexVertexIterT(const VertexVertexIterT& _rhs) :
    mesh_(_rhs.mesh_),
    start_(_rhs.start_),
    heh_(_rhs.heh_),
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    lap_counter_(_rhs.lap_counter_)
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  {  ; }


  /// Assignment operator
  VertexVertexIterT& operator=(const VertexVertexIterT<Mesh>& _rhs)
  {
    mesh_   = _rhs.mesh_;
    start_  = _rhs.start_;
    heh_    = _rhs.heh_;
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    lap_counter_ = _rhs.lap_counter_;
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    return *this;
  }


#if 0
  /// construct from non-const circulator type
  VertexVertexIterT(const VertexVertexIterT<Mesh>& _rhs) :
    mesh_(_rhs.mesh_),
    start_(_rhs.start_),
    heh_(_rhs.heh_),
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    lap_counter_(_rhs.lap_counter_)
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  {  ; }


  /// assign from non-const circulator
  VertexVertexIterT& operator=(const VertexVertexIterT<Mesh>& _rhs)
  {
    mesh_   = _rhs.mesh_;
    start_  = _rhs.start_;
    heh_    = _rhs.heh_;
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    lap_counter_ = _rhs.lap_counter_;
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    return *this;
  }
#else
  friend class ConstVertexVertexIterT<Mesh>;
#endif  


  /// Equal ?
  bool operator==(const VertexVertexIterT& _rhs) const {
    return ((mesh_   == _rhs.mesh_) &&
	    (start_  == _rhs.start_) &&
	    (heh_    == _rhs.heh_) &&
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	    (lap_counter_ == _rhs.lap_counter_));
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  }


  /// Not equal ?
  bool operator!=(const VertexVertexIterT& _rhs) const {
    return !operator==(_rhs);
  }


  /// Pre-Increment (next cw target)
  VertexVertexIterT& operator++() { 
    assert(mesh_);
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    heh_=mesh_->cw_rotated_halfedge_handle(heh_);
    if(heh_ == start_) lap_counter_++;
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    return *this;
  }


  /// Pre-Decrement (next ccw target)
  VertexVertexIterT& operator--() { 
    assert(mesh_);
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    if(heh_ == start_) lap_counter_--;
    heh_=mesh_->ccw_rotated_halfedge_handle(heh_);
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    return *this;
  }


  /** Get the current halfedge. There are \c Vertex*Iters and \c
      Face*Iters.  For both the current state is defined by the
      current halfedge. This is what this method returns. 
  */
  HalfedgeHandle current_halfedge_handle() const {
    return heh_;
  }


  /// Return the handle of the current target.
  typename Mesh::VertexHandle handle() const {
    assert(mesh_);
    return mesh_->to_vertex_handle(heh_);; 
  }


  /// Cast to the handle of the current target.
  operator typename Mesh::VertexHandle() const {
    assert(mesh_);
    return mesh_->to_vertex_handle(heh_);; 
  }
    

  ///  Return a reference to the current target.
  reference operator*() const { 
    assert(mesh_);
    return mesh_->deref(handle());
  }


  /// Return a pointer to the current target.
  pointer operator->() const {
    assert(mesh_);
    return &mesh_->deref(handle());
  }


  /** Returns whether the circulator is still valid.
      After one complete round around a vertex/face the circulator becomes
      invalid, i.e. this function will return \c false. Nevertheless you
      can continue circulating. This method just tells you whether you
      have completed the first round.
   */
  operator bool() const {
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    return heh_.is_valid() && ((start_ != heh_) || (lap_counter_ == 0));
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  }


protected:

  mesh_ptr         mesh_;
  HalfedgeHandle   start_, heh_;
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  int              lap_counter_;
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};



//== CLASS DEFINITION =========================================================

	      
/** \class ConstVertexVertexIterT CirculatorsT.hh <OpenMesh/Mesh/Iterators/CirculatorsT.hh>
    Circulator.
*/

template <class Mesh>
class ConstVertexVertexIterT
{
 public:


  //--- Typedefs ---

  typedef typename Mesh::HalfedgeHandle   HalfedgeHandle;

  typedef typename Mesh::Vertex           value_type;
  typedef typename Mesh::VertexHandle         value_handle;

#if 1
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  typedef std::bidirectional_iterator_tag   iterator_category;
  typedef ptrdiff_t                         difference_type;
  typedef const Mesh&                       mesh_ref;
  typedef const Mesh*                       mesh_ptr;
  typedef const typename Mesh::Vertex&      reference;
  typedef const typename Mesh::Vertex*      pointer;
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#else
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  typedef std::bidirectional_iterator_tag   iterator_category;
  typedef ptrdiff_t                         difference_type;
  typedef Mesh&                             mesh_ref;
  typedef Mesh*                             mesh_ptr;
  typedef typename Mesh::Vertex&            reference;
  typedef typename Mesh::Vertex*            pointer;
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#endif



  /// Default constructor
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  ConstVertexVertexIterT() : mesh_(0), lap_counter_(0) {}
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  /// Construct with mesh and a typename Mesh::VertexHandle
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  ConstVertexVertexIterT(mesh_ref _mesh, typename Mesh::VertexHandle _start, bool _end = false) :
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    mesh_(&_mesh), 
    start_(_mesh.halfedge_handle(_start)),
    heh_(start_),
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    lap_counter_(_end)
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  {  ; }


  /// Construct with mesh and start halfedge
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  ConstVertexVertexIterT(mesh_ref _mesh, HalfedgeHandle _heh, bool _end = false) :
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    mesh_(&_mesh),
    start_(_heh),
    heh_(_heh),
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    lap_counter_(_end)
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  {  ; }


  /// Copy constructor
  ConstVertexVertexIterT(const ConstVertexVertexIterT& _rhs) :
    mesh_(_rhs.mesh_),
    start_(_rhs.start_),
    heh_(_rhs.heh_),
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    lap_counter_(_rhs.lap_counter_)
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  {  ; }


  /// Assignment operator
  ConstVertexVertexIterT& operator=(const ConstVertexVertexIterT<Mesh>& _rhs)
  {
    mesh_   = _rhs.mesh_;
    start_  = _rhs.start_;
    heh_    = _rhs.heh_;
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    lap_counter_ = _rhs.lap_counter_;
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    return *this;
  }


#if 1
  /// construct from non-const circulator type
  ConstVertexVertexIterT(const VertexVertexIterT<Mesh>& _rhs) :
    mesh_(_rhs.mesh_),
    start_(_rhs.start_),
    heh_(_rhs.heh_),
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    lap_counter_(_rhs.lap_counter_)
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  {  ; }


  /// assign from non-const circulator
  ConstVertexVertexIterT& operator=(const VertexVertexIterT<Mesh>& _rhs)
  {
    mesh_   = _rhs.mesh_;
    start_  = _rhs.start_;
    heh_    = _rhs.heh_;
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    lap_counter_ = _rhs.lap_counter_;
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    return *this;
  }
#else
  friend class ConstVertexVertexIterT<Mesh>;
#endif  


  /// Equal ?
  bool operator==(const ConstVertexVertexIterT& _rhs) const {
    return ((mesh_   == _rhs.mesh_) &&
	    (start_  == _rhs.start_) &&
	    (heh_    == _rhs.heh_) &&
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	    (lap_counter_ == _rhs.lap_counter_));
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  }


  /// Not equal ?
  bool operator!=(const ConstVertexVertexIterT& _rhs) const {
    return !operator==(_rhs);
  }


  /// Pre-Increment (next cw target)
  ConstVertexVertexIterT& operator++() { 
    assert(mesh_);
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    heh_=mesh_->cw_rotated_halfedge_handle(heh_);
    if(heh_ == start_) lap_counter_++;
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    return *this;
  }


  /// Pre-Decrement (next ccw target)
  ConstVertexVertexIterT& operator--() { 
    assert(mesh_);
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    if(heh_ == start_) lap_counter_--;
    heh_=mesh_->ccw_rotated_halfedge_handle(heh_);
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    return *this;
  }


  /** Get the current halfedge. There are \c Vertex*Iters and \c
      Face*Iters.  For both the current state is defined by the
      current halfedge. This is what this method returns. 
  */
  HalfedgeHandle current_halfedge_handle() const {
    return heh_;
  }


  /// Return the handle of the current target.
  typename Mesh::VertexHandle handle() const {
    assert(mesh_);
    return mesh_->to_vertex_handle(heh_);; 
  }


  /// Cast to the handle of the current target.
  operator typename Mesh::VertexHandle() const {
    assert(mesh_);
    return mesh_->to_vertex_handle(heh_);; 
  }
    

  ///  Return a reference to the current target.
  reference operator*() const { 
    assert(mesh_);
    return mesh_->deref(handle());
  }


  /// Return a pointer to the current target.
  pointer operator->() const { 
    assert(mesh_);
    return &mesh_->deref(handle());
  }


  /** Returns whether the circulator is still valid.
      After one complete round around a vertex/face the circulator becomes
      invalid, i.e. this function will return \c false. Nevertheless you
      can continue circulating. This method just tells you whether you
      have completed the first round.
   */
  operator bool() const { 
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    return heh_.is_valid() && ((start_ != heh_) || (lap_counter_ == 0));
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  }


protected:

  mesh_ptr         mesh_;
  HalfedgeHandle   start_, heh_;
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  int              lap_counter_;
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};



//== CLASS DEFINITION =========================================================


/** \class VertexOHalfedgeIterT CirculatorsT.hh <OpenMesh/Mesh/Iterators/CirculatorsT.hh>
    Circulator.
*/

template <class Mesh>
class VertexOHalfedgeIterT
{
 public:


  //--- Typedefs ---

  typedef typename Mesh::HalfedgeHandle   HalfedgeHandle;

  typedef typename Mesh::Halfedge           value_type;
  typedef typename Mesh::HalfedgeHandle         value_handle;

#if 0
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  typedef std::bidirectional_iterator_tag   iterator_category;
  typedef ptrdiff_t                         difference_type;
  typedef const Mesh&                       mesh_ref;
  typedef const Mesh*                       mesh_ptr;
  typedef const typename Mesh::Halfedge&    reference;
  typedef const typename Mesh::Halfedge*    pointer;
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#else
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  typedef std::bidirectional_iterator_tag   iterator_category;
  typedef ptrdiff_t                         difference_type;
  typedef Mesh&                             mesh_ref;
  typedef Mesh*                             mesh_ptr;
  typedef typename Mesh::Halfedge&          reference;
  typedef typename Mesh::Halfedge*          pointer;
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#endif



  /// Default constructor
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  VertexOHalfedgeIterT() : mesh_(0), lap_counter_(false) {}
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  /// Construct with mesh and a typename Mesh::VertexHandle
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  VertexOHalfedgeIterT(mesh_ref _mesh, typename Mesh::VertexHandle _start, bool _end = false) :
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    mesh_(&_mesh), 
    start_(_mesh.halfedge_handle(_start)),
    heh_(start_),
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    lap_counter_(_end)
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  {  ; }


  /// Construct with mesh and start halfedge
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  VertexOHalfedgeIterT(mesh_ref _mesh, HalfedgeHandle _heh, bool _end = false) :
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    mesh_(&_mesh),
    start_(_heh),
    heh_(_heh),
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    lap_counter_(_end)
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  {  ; }


  /// Copy constructor
  VertexOHalfedgeIterT(const VertexOHalfedgeIterT& _rhs) :
    mesh_(_rhs.mesh_),
    start_(_rhs.start_),
    heh_(_rhs.heh_),
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    lap_counter_(_rhs.lap_counter_)
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  {  ; }


  /// Assignment operator
  VertexOHalfedgeIterT& operator=(const VertexOHalfedgeIterT<Mesh>& _rhs)
  {
    mesh_   = _rhs.mesh_;
    start_  = _rhs.start_;
    heh_    = _rhs.heh_;
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    lap_counter_ = _rhs.lap_counter_;
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    return *this;
  }


#if 0
  /// construct from non-const circulator type
  VertexOHalfedgeIterT(const VertexOHalfedgeIterT<Mesh>& _rhs) :
    mesh_(_rhs.mesh_),
    start_(_rhs.start_),
    heh_(_rhs.heh_),
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    lap_counter_(_rhs.lap_counter_)
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  {  ; }


  /// assign from non-const circulator
  VertexOHalfedgeIterT& operator=(const VertexOHalfedgeIterT<Mesh>& _rhs)
  {
    mesh_   = _rhs.mesh_;
    start_  = _rhs.start_;
    heh_    = _rhs.heh_;
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    lap_counter_ = _rhs.lap_counter_;
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    return *this;
  }
#else
  friend class ConstVertexOHalfedgeIterT<Mesh>;
#endif  


  /// Equal ?
  bool operator==(const VertexOHalfedgeIterT& _rhs) const {
    return ((mesh_   == _rhs.mesh_) &&
	    (start_  == _rhs.start_) &&
	    (heh_    == _rhs.heh_) &&
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	    (lap_counter_ == _rhs.lap_counter_));
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  }


  /// Not equal ?
  bool operator!=(const VertexOHalfedgeIterT& _rhs) const {
    return !operator==(_rhs);
  }


  /// Pre-Increment (next cw target)
  VertexOHalfedgeIterT& operator++() { 
    assert(mesh_);
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    heh_=mesh_->cw_rotated_halfedge_handle(heh_);
    if(heh_ == start_) lap_counter_++;
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    return *this;
  }


  /// Pre-Decrement (next ccw target)
  VertexOHalfedgeIterT& operator--() { 
    assert(mesh_);
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    if(heh_ == start_) lap_counter_--;
    heh_=mesh_->ccw_rotated_halfedge_handle(heh_);
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    return *this;
  }


  /** Get the current halfedge. There are \c Vertex*Iters and \c
      Face*Iters.  For both the current state is defined by the
      current halfedge. This is what this method returns. 
  */
  HalfedgeHandle current_halfedge_handle() const {
    return heh_;
  }


  /// Return the handle of the current target.
  typename Mesh::HalfedgeHandle handle() const {
    assert(mesh_);
    return heh_; 
  }


  /// Cast to the handle of the current target.
  operator typename Mesh::HalfedgeHandle() const {
    assert(mesh_);
    return heh_; 
  }
    

  ///  Return a reference to the current target.
  reference operator*() const {
    assert(mesh_);
    return mesh_->deref(handle());
  }


  /// Return a pointer to the current target.
  pointer operator->() const { 
    assert(mesh_);
    return &mesh_->deref(handle());
  }


  /** Returns whether the circulator is still valid.
      After one complete round around a vertex/face the circulator becomes
      invalid, i.e. this function will return \c false. Nevertheless you
      can continue circulating. This method just tells you whether you
      have completed the first round.
   */
  operator bool() const { 
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    return heh_.is_valid() && ((start_ != heh_) || (lap_counter_ == 0));
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  }


protected:

  mesh_ptr         mesh_;
  HalfedgeHandle   start_, heh_;
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  int              lap_counter_;
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};



//== CLASS DEFINITION =========================================================

	      
/** \class ConstVertexOHalfedgeIterT CirculatorsT.hh <OpenMesh/Mesh/Iterators/CirculatorsT.hh>
    Circulator.
*/

template <class Mesh>
class ConstVertexOHalfedgeIterT
{
 public:


  //--- Typedefs ---

  typedef typename Mesh::HalfedgeHandle   HalfedgeHandle;

  typedef typename Mesh::Halfedge           value_type;
  typedef typename Mesh::HalfedgeHandle         value_handle;

#if 1
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  typedef std::bidirectional_iterator_tag   iterator_category;
  typedef ptrdiff_t                         difference_type;
  typedef const Mesh&                       mesh_ref;
  typedef const Mesh*                       mesh_ptr;
  typedef const typename Mesh::Halfedge&    reference;
  typedef const typename Mesh::Halfedge*    pointer;
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#else
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  typedef std::bidirectional_iterator_tag   iterator_category;
  typedef ptrdiff_t                         difference_type;
  typedef Mesh&                             mesh_ref;
  typedef Mesh*                             mesh_ptr;
  typedef typename Mesh::Halfedge&          reference;
  typedef typename Mesh::Halfedge*          pointer;
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#endif



  /// Default constructor
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  ConstVertexOHalfedgeIterT() : mesh_(0), lap_counter_(false) {}
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  /// Construct with mesh and a typename Mesh::VertexHandle
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  ConstVertexOHalfedgeIterT(mesh_ref _mesh, typename Mesh::VertexHandle _start, bool _end = false) :
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    mesh_(&_mesh), 
    start_(_mesh.halfedge_handle(_start)),
    heh_(start_),
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    lap_counter_(_end)
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  {  ; }


  /// Construct with mesh and start halfedge
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  ConstVertexOHalfedgeIterT(mesh_ref _mesh, HalfedgeHandle _heh, bool _end = false) :
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    mesh_(&_mesh),
    start_(_heh),
    heh_(_heh),
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    lap_counter_(_end)
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  {  ; }


  /// Copy constructor
  ConstVertexOHalfedgeIterT(const ConstVertexOHalfedgeIterT& _rhs) :
    mesh_(_rhs.mesh_),
    start_(_rhs.start_),
    heh_(_rhs.heh_),
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    lap_counter_(_rhs.lap_counter_)
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  {  ; }


  /// Assignment operator
  ConstVertexOHalfedgeIterT& operator=(const ConstVertexOHalfedgeIterT<Mesh>& _rhs)
  {
    mesh_   = _rhs.mesh_;
    start_  = _rhs.start_;
    heh_    = _rhs.heh_;
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    lap_counter_ = _rhs.lap_counter_;
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    return *this;
  }


#if 1
  /// construct from non-const circulator type
  ConstVertexOHalfedgeIterT(const VertexOHalfedgeIterT<Mesh>& _rhs) :
    mesh_(_rhs.mesh_),
    start_(_rhs.start_),
    heh_(_rhs.heh_),
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    lap_counter_(_rhs.lap_counter_)
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  {  ; }


  /// assign from non-const circulator
  ConstVertexOHalfedgeIterT& operator=(const VertexOHalfedgeIterT<Mesh>& _rhs)
  {
    mesh_   = _rhs.mesh_;
    start_  = _rhs.start_;
    heh_    = _rhs.heh_;
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    lap_counter_ = _rhs.lap_counter_;
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    return *this;
  }
#else
  friend class ConstVertexOHalfedgeIterT<Mesh>;
#endif  


  /// Equal ?
  bool operator==(const ConstVertexOHalfedgeIterT& _rhs) const {
    return ((mesh_   == _rhs.mesh_) &&
	    (start_  == _rhs.start_) &&
	    (heh_    == _rhs.heh_) &&
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	    (lap_counter_ == _rhs.lap_counter_));
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  }


  /// Not equal ?
  bool operator!=(const ConstVertexOHalfedgeIterT& _rhs) const {
    return !operator==(_rhs);
  }


  /// Pre-Increment (next cw target)
  ConstVertexOHalfedgeIterT& operator++() { 
    assert(mesh_);
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    heh_=mesh_->cw_rotated_halfedge_handle(heh_);
    if(heh_ == start_) lap_counter_++;
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    return *this;
  }


  /// Pre-Decrement (next ccw target)
  ConstVertexOHalfedgeIterT& operator--() { 
    assert(mesh_);
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    if(heh_ == start_) lap_counter_--;
    heh_=mesh_->ccw_rotated_halfedge_handle(heh_);
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    return *this;
  }


  /** Get the current halfedge. There are \c Vertex*Iters and \c
      Face*Iters.  For both the current state is defined by the
      current halfedge. This is what this method returns. 
  */
  HalfedgeHandle current_halfedge_handle() const {
    return heh_;
  }


  /// Return the handle of the current target.
  typename Mesh::HalfedgeHandle handle() const {
    assert(mesh_);
    return heh_; 
  }


  /// Cast to the handle of the current target.
  operator typename Mesh::HalfedgeHandle() const {
    assert(mesh_);
    return heh_; 
  }
    

  ///  Return a reference to the current target.
  reference operator*() const { 
    assert(mesh_);
    return mesh_->deref(handle());
  }


  /// Return a pointer to the current target.
  pointer operator->() const { 
    assert(mesh_);
    return &mesh_->deref(handle());
  }


  /** Returns whether the circulator is still valid.
      After one complete round around a vertex/face the circulator becomes
      invalid, i.e. this function will return \c false. Nevertheless you
      can continue circulating. This method just tells you whether you
      have completed the first round.
   */
  operator bool() const { 
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    return heh_.is_valid() && ((start_ != heh_) || (lap_counter_ == 0));
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  }


protected:

  mesh_ptr         mesh_;
  HalfedgeHandle   start_, heh_;
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  int              lap_counter_;
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};



//== CLASS DEFINITION =========================================================

	      
/** \class VertexIHalfedgeIterT CirculatorsT.hh <OpenMesh/Mesh/Iterators/CirculatorsT.hh>
    Circulator.
*/

template <class Mesh>
class VertexIHalfedgeIterT
{
 public:


  //--- Typedefs ---

  typedef typename Mesh::HalfedgeHandle   HalfedgeHandle;

  typedef typename Mesh::Halfedge           value_type;
  typedef typename Mesh::HalfedgeHandle         value_handle;

#if 0
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  typedef std::bidirectional_iterator_tag   iterator_category;
  typedef ptrdiff_t                         difference_type;
  typedef const Mesh&                       mesh_ref;
  typedef const Mesh*                       mesh_ptr;
  typedef const typename Mesh::Halfedge&    reference;
  typedef const typename Mesh::Halfedge*    pointer;
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#else
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  typedef std::bidirectional_iterator_tag   iterator_category;
  typedef ptrdiff_t                         difference_type;
  typedef Mesh&                             mesh_ref;
  typedef Mesh*                             mesh_ptr;
  typedef typename Mesh::Halfedge&          reference;
  typedef typename Mesh::Halfedge*          pointer;
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#endif



  /// Default constructor
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  VertexIHalfedgeIterT() : mesh_(0), lap_counter_(false) {}
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  /// Construct with mesh and a typename Mesh::VertexHandle
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  VertexIHalfedgeIterT(mesh_ref _mesh, typename Mesh::VertexHandle _start, bool _end = false) :
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    mesh_(&_mesh), 
    start_(_mesh.halfedge_handle(_start)),
    heh_(start_),
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    lap_counter_(_end)
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  {  ; }


  /// Construct with mesh and start halfedge
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  VertexIHalfedgeIterT(mesh_ref _mesh, HalfedgeHandle _heh, bool _end = false) :
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    mesh_(&_mesh),
    start_(_heh),
    heh_(_heh),
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    lap_counter_(_end)
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  {  ; }


  /// Copy constructor
  VertexIHalfedgeIterT(const VertexIHalfedgeIterT& _rhs) :
    mesh_(_rhs.mesh_),
    start_(_rhs.start_),
    heh_(_rhs.heh_),
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    lap_counter_(_rhs.lap_counter_)
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  {  ; }


  /// Assignment operator
  VertexIHalfedgeIterT& operator=(const VertexIHalfedgeIterT<Mesh>& _rhs)
  {
    mesh_   = _rhs.mesh_;
    start_  = _rhs.start_;
    heh_    = _rhs.heh_;
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    lap_counter_ = _rhs.lap_counter_;
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    return *this;
  }


#if 0
  /// construct from non-const circulator type
  VertexIHalfedgeIterT(const VertexIHalfedgeIterT<Mesh>& _rhs) :
    mesh_(_rhs.mesh_),
    start_(_rhs.start_),
    heh_(_rhs.heh_),
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    lap_counter_(_rhs.lap_counter_)
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  {  ; }


  /// assign from non-const circulator
  VertexIHalfedgeIterT& operator=(const VertexIHalfedgeIterT<Mesh>& _rhs)
  {
    mesh_   = _rhs.mesh_;
    start_  = _rhs.start_;
    heh_    = _rhs.heh_;
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    lap_counter_ = _rhs.lap_counter_;
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    return *this;
  }
#else
  friend class ConstVertexIHalfedgeIterT<Mesh>;
#endif  


  /// Equal ?
  bool operator==(const VertexIHalfedgeIterT& _rhs) const {
    return ((mesh_   == _rhs.mesh_) &&
	    (start_  == _rhs.start_) &&
	    (heh_    == _rhs.heh_) &&
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	    (lap_counter_ == _rhs.lap_counter_));
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  }


  /// Not equal ?
  bool operator!=(const VertexIHalfedgeIterT& _rhs) const {
    return !operator==(_rhs);
  }


  /// Pre-Increment (next cw target)
  VertexIHalfedgeIterT& operator++() { 
    assert(mesh_);
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    heh_=mesh_->cw_rotated_halfedge_handle(heh_);
    if(heh_ == start_) lap_counter_++;
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    return *this;
  }


  /// Pre-Decrement (next ccw target)
  VertexIHalfedgeIterT& operator--() { 
    assert(mesh_);
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    if(heh_ == start_) lap_counter_--;
    heh_=mesh_->ccw_rotated_halfedge_handle(heh_);
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    return *this;
  }


  /** Get the current halfedge. There are \c Vertex*Iters and \c
      Face*Iters.  For both the current state is defined by the
      current halfedge. This is what this method returns. 
  */
  HalfedgeHandle current_halfedge_handle() const {
    return heh_;
  }


  /// Return the handle of the current target.
  typename Mesh::HalfedgeHandle handle() const {
    assert(mesh_);
    return mesh_->opposite_halfedge_handle(heh_); 
  }


  /// Cast to the handle of the current target.
  operator typename Mesh::HalfedgeHandle() const {
    assert(mesh_);
    return mesh_->opposite_halfedge_handle(heh_); 
  }
    

  ///  Return a reference to the current target.
  reference operator*() const { 
    assert(mesh_);
    return mesh_->deref(handle());
  }


  /// Return a pointer to the current target.
  pointer operator->() const { 
    assert(mesh_);
    return &mesh_->deref(handle());
  }


  /** Returns whether the circulator is still valid.
      After one complete round around a vertex/face the circulator becomes
      invalid, i.e. this function will return \c false. Nevertheless you
      can continue circulating. This method just tells you whether you
      have completed the first round.
   */
  operator bool() const { 
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    return heh_.is_valid() && ((start_ != heh_) || (lap_counter_ == 0));
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  }


protected:

  mesh_ptr         mesh_;
  HalfedgeHandle   start_, heh_;
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  int              lap_counter_;
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};



//== CLASS DEFINITION =========================================================


/** \class ConstVertexIHalfedgeIterT CirculatorsT.hh <OpenMesh/Mesh/Iterators/CirculatorsT.hh>
    Circulator.
*/

template <class Mesh>
class ConstVertexIHalfedgeIterT
{
 public:


  //--- Typedefs ---

  typedef typename Mesh::HalfedgeHandle   HalfedgeHandle;

  typedef typename Mesh::Halfedge           value_type;
  typedef typename Mesh::HalfedgeHandle         value_handle;

#if 1
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  typedef std::bidirectional_iterator_tag   iterator_category;
  typedef ptrdiff_t                         difference_type;
  typedef const Mesh&                       mesh_ref;
  typedef const Mesh*                       mesh_ptr;
  typedef const typename Mesh::Halfedge&    reference;
  typedef const typename Mesh::Halfedge*    pointer;
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#else
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  typedef std::bidirectional_iterator_tag   iterator_category;
  typedef ptrdiff_t                         difference_type;
  typedef Mesh&                             mesh_ref;
  typedef Mesh*                             mesh_ptr;
  typedef typename Mesh::Halfedge&          reference;
  typedef typename Mesh::Halfedge*          pointer;
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#endif



  /// Default constructor
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  ConstVertexIHalfedgeIterT() : mesh_(0), lap_counter_(false) {}
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  /// Construct with mesh and a typename Mesh::VertexHandle
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  ConstVertexIHalfedgeIterT(mesh_ref _mesh, typename Mesh::VertexHandle _start, bool _end = false) :
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    mesh_(&_mesh), 
    start_(_mesh.halfedge_handle(_start)),
    heh_(start_),
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    lap_counter_(_end)
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  {  ; }


  /// Construct with mesh and start halfedge
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  ConstVertexIHalfedgeIterT(mesh_ref _mesh, HalfedgeHandle _heh, bool _end = false) :
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    mesh_(&_mesh),
    start_(_heh),
    heh_(_heh),
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    lap_counter_(_end)
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  {  ; }


  /// Copy constructor
  ConstVertexIHalfedgeIterT(const ConstVertexIHalfedgeIterT& _rhs) :
    mesh_(_rhs.mesh_),
    start_(_rhs.start_),
    heh_(_rhs.heh_),
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    lap_counter_(_rhs.lap_counter_)
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  {  ; }


  /// Assignment operator
  ConstVertexIHalfedgeIterT& operator=(const ConstVertexIHalfedgeIterT<Mesh>& _rhs)
  {
    mesh_   = _rhs.mesh_;
    start_  = _rhs.start_;
    heh_    = _rhs.heh_;
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    lap_counter_ = _rhs.lap_counter_;
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    return *this;
  }


#if 1
  /// construct from non-const circulator type
  ConstVertexIHalfedgeIterT(const VertexIHalfedgeIterT<Mesh>& _rhs) :
    mesh_(_rhs.mesh_),
    start_(_rhs.start_),
    heh_(_rhs.heh_),
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    lap_counter_(_rhs.lap_counter_)
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  {  ; }


  /// assign from non-const circulator
  ConstVertexIHalfedgeIterT& operator=(const VertexIHalfedgeIterT<Mesh>& _rhs)
  {
    mesh_   = _rhs.mesh_;
    start_  = _rhs.start_;
    heh_    = _rhs.heh_;
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    lap_counter_ = _rhs.lap_counter_;
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    return *this;
  }
#else
  friend class ConstVertexIHalfedgeIterT<Mesh>;
#endif  


  /// Equal ?
  bool operator==(const ConstVertexIHalfedgeIterT& _rhs) const {
    return ((mesh_   == _rhs.mesh_) &&
	    (start_  == _rhs.start_) &&
	    (heh_    == _rhs.heh_) &&
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	    (lap_counter_ == _rhs.lap_counter_));
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  }


  /// Not equal ?
  bool operator!=(const ConstVertexIHalfedgeIterT& _rhs) const {
    return !operator==(_rhs);
  }


  /// Pre-Increment (next cw target)
  ConstVertexIHalfedgeIterT& operator++() { 
    assert(mesh_);
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    heh_=mesh_->cw_rotated_halfedge_handle(heh_);
    if(heh_ == start_) lap_counter_++;
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    return *this;
  }


  /// Pre-Decrement (next ccw target)
  ConstVertexIHalfedgeIterT& operator--() { 
    assert(mesh_);
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    if(heh_ == start_) lap_counter_--;
    heh_=mesh_->ccw_rotated_halfedge_handle(heh_);
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    return *this;
  }


  /** Get the current halfedge. There are \c Vertex*Iters and \c
      Face*Iters.  For both the current state is defined by the
      current halfedge. This is what this method returns. 
  */
  HalfedgeHandle current_halfedge_handle() const {
    return heh_;
  }


  /// Return the handle of the current target.
  typename Mesh::HalfedgeHandle handle() const {
    assert(mesh_);
    return mesh_->opposite_halfedge_handle(heh_); 
  }


  /// Cast to the handle of the current target.
  operator typename Mesh::HalfedgeHandle() const {
    assert(mesh_);
    return mesh_->opposite_halfedge_handle(heh_); 
  }
    

  ///  Return a reference to the current target.
  reference operator*() const { 
    assert(mesh_);
    return mesh_->deref(handle());
  }


  /// Return a pointer to the current target.
  pointer operator->() const { 
    assert(mesh_);
    return &mesh_->deref(handle());
  }


  /** Returns whether the circulator is still valid.
      After one complete round around a vertex/face the circulator becomes
      invalid, i.e. this function will return \c false. Nevertheless you
      can continue circulating. This method just tells you whether you
      have completed the first round.
   */
  operator bool() const { 
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    return heh_.is_valid() && ((start_ != heh_) || (lap_counter_ == 0));
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  }


protected:

  mesh_ptr         mesh_;
  HalfedgeHandle   start_, heh_;
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  int              lap_counter_;
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};



//== CLASS DEFINITION =========================================================

	      
/** \class VertexEdgeIterT CirculatorsT.hh <OpenMesh/Mesh/Iterators/CirculatorsT.hh>
    Circulator.
*/

template <class Mesh>
class VertexEdgeIterT
{
 public:


  //--- Typedefs ---

  typedef typename Mesh::HalfedgeHandle   HalfedgeHandle;

  typedef typename Mesh::Edge           value_type;
  typedef typename Mesh::EdgeHandle         value_handle;

#if 0
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  typedef std::bidirectional_iterator_tag   iterator_category;
  typedef ptrdiff_t                         difference_type;
  typedef const Mesh&                       mesh_ref;
  typedef const Mesh*                       mesh_ptr;
  typedef const typename Mesh::Edge&        reference;
  typedef const typename Mesh::Edge*        pointer;
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#else
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  typedef std::bidirectional_iterator_tag   iterator_category;
  typedef ptrdiff_t                         difference_type;
  typedef Mesh&                             mesh_ref;
  typedef Mesh*                             mesh_ptr;
  typedef typename Mesh::Edge&              reference;
  typedef typename Mesh::Edge*              pointer;
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#endif



  /// Default constructor
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  VertexEdgeIterT() : mesh_(0), lap_counter_(false) {}
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  /// Construct with mesh and a typename Mesh::VertexHandle
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  VertexEdgeIterT(mesh_ref _mesh, typename Mesh::VertexHandle _start, bool _end = false) :
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    mesh_(&_mesh), 
    start_(_mesh.halfedge_handle(_start)),
    heh_(start_),
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    lap_counter_(_end)
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  {  ; }


  /// Construct with mesh and start halfedge
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  VertexEdgeIterT(mesh_ref _mesh, HalfedgeHandle _heh, bool _end = false) :
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    mesh_(&_mesh),
    start_(_heh),
    heh_(_heh),
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    lap_counter_(_end)
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  {  ; }


  /// Copy constructor
  VertexEdgeIterT(const VertexEdgeIterT& _rhs) :
    mesh_(_rhs.mesh_),
    start_(_rhs.start_),
    heh_(_rhs.heh_),
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    lap_counter_(_rhs.lap_counter_)
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  {  ; }


  /// Assignment operator
  VertexEdgeIterT& operator=(const VertexEdgeIterT<Mesh>& _rhs)
  {
    mesh_   = _rhs.mesh_;
    start_  = _rhs.start_;
    heh_    = _rhs.heh_;
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    lap_counter_ = _rhs.lap_counter_;
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    return *this;
  }


#if 0
  /// construct from non-const circulator type
  VertexEdgeIterT(const VertexEdgeIterT<Mesh>& _rhs) :
    mesh_(_rhs.mesh_),
    start_(_rhs.start_),
    heh_(_rhs.heh_),
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    lap_counter_(_rhs.lap_counter_)
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  {  ; }


  /// assign from non-const circulator
  VertexEdgeIterT& operator=(const VertexEdgeIterT<Mesh>& _rhs)
  {
    mesh_   = _rhs.mesh_;
    start_  = _rhs.start_;
    heh_    = _rhs.heh_;
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    lap_counter_ = _rhs.lap_counter_;
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    return *this;
  }
#else
  friend class ConstVertexEdgeIterT<Mesh>;
#endif  


  /// Equal ?
  bool operator==(const VertexEdgeIterT& _rhs) const {
    return ((mesh_   == _rhs.mesh_) &&
	    (start_  == _rhs.start_) &&
	    (heh_    == _rhs.heh_) &&
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	    (lap_counter_ == _rhs.lap_counter_));
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  }


  /// Not equal ?
  bool operator!=(const VertexEdgeIterT& _rhs) const {
    return !operator==(_rhs);
  }


  /// Pre-Increment (next cw target)
  VertexEdgeIterT& operator++() { 
    assert(mesh_);
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    heh_=mesh_->cw_rotated_halfedge_handle(heh_);
    if(heh_ == start_) lap_counter_++;
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    return *this;
  }


  /// Pre-Decrement (next ccw target)
  VertexEdgeIterT& operator--() { 
    assert(mesh_);
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    if(heh_ == start_) lap_counter_--;
    heh_=mesh_->ccw_rotated_halfedge_handle(heh_);
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    return *this;
  }


  /** Get the current halfedge. There are \c Vertex*Iters and \c
      Face*Iters.  For both the current state is defined by the
      current halfedge. This is what this method returns. 
  */
  HalfedgeHandle current_halfedge_handle() const {
    return heh_;
  }


  /// Return the handle of the current target.
  typename Mesh::EdgeHandle handle() const {
    assert(mesh_);
    return mesh_->edge_handle(heh_); 
  }


  /// Cast to the handle of the current target.
  operator typename Mesh::EdgeHandle() const {
    assert(mesh_);
    return mesh_->edge_handle(heh_); 
  }
    

  ///  Return a reference to the current target.
  reference operator*() const { 
    assert(mesh_);
    return mesh_->deref(handle());
  }


  /// Return a pointer to the current target.
  pointer operator->() const { 
    assert(mesh_);
    return &mesh_->deref(handle());
  }


  /** Returns whether the circulator is still valid.
      After one complete round around a vertex/face the circulator becomes
      invalid, i.e. this function will return \c false. Nevertheless you
      can continue circulating. This method just tells you whether you
      have completed the first round.
   */
  operator bool() const { 
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    return heh_.is_valid() && ((start_ != heh_) || (lap_counter_ == 0));
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  }


protected:

  mesh_ptr         mesh_;
  HalfedgeHandle   start_, heh_;
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  int              lap_counter_;
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};



//== CLASS DEFINITION =========================================================

	      
/** \class ConstVertexEdgeIterT CirculatorsT.hh <OpenMesh/Mesh/Iterators/CirculatorsT.hh>
    Circulator.
*/

template <class Mesh>
class ConstVertexEdgeIterT
{
 public:


  //--- Typedefs ---

  typedef typename Mesh::HalfedgeHandle   HalfedgeHandle;

  typedef typename Mesh::Edge           value_type;
  typedef typename Mesh::EdgeHandle         value_handle;

#if 1
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  typedef std::bidirectional_iterator_tag   iterator_category;
  typedef ptrdiff_t                         difference_type;
  typedef const Mesh&                       mesh_ref;
  typedef const Mesh*                       mesh_ptr;
  typedef const typename Mesh::Edge&        reference;
  typedef const typename Mesh::Edge*        pointer;
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#else
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  typedef std::bidirectional_iterator_tag   iterator_category;
  typedef ptrdiff_t                         difference_type;
  typedef Mesh&                             mesh_ref;
  typedef Mesh*                             mesh_ptr;
  typedef typename Mesh::Edge&              reference;
  typedef typename Mesh::Edge*              pointer;
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#endif



  /// Default constructor
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  ConstVertexEdgeIterT() : mesh_(0), lap_counter_(false) {}
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  /// Construct with mesh and a typename Mesh::VertexHandle
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  ConstVertexEdgeIterT(mesh_ref _mesh, typename Mesh::VertexHandle _start, bool _end = false) :
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    mesh_(&_mesh), 
    start_(_mesh.halfedge_handle(_start)),
    heh_(start_),
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    lap_counter_(_end)
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  {  ; }


  /// Construct with mesh and start halfedge
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  ConstVertexEdgeIterT(mesh_ref _mesh, HalfedgeHandle _heh, bool _end = false) :
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    mesh_(&_mesh),
    start_(_heh),
    heh_(_heh),
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    lap_counter_(_end)
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  {  ; }


  /// Copy constructor
  ConstVertexEdgeIterT(const ConstVertexEdgeIterT& _rhs) :
    mesh_(_rhs.mesh_),
    start_(_rhs.start_),
    heh_(_rhs.heh_),
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    lap_counter_(_rhs.lap_counter_)
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  {  ; }


  /// Assignment operator
  ConstVertexEdgeIterT& operator=(const ConstVertexEdgeIterT<Mesh>& _rhs)
  {
    mesh_   = _rhs.mesh_;
    start_  = _rhs.start_;
    heh_    = _rhs.heh_;