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CirculatorsT.hh
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48 
49 #ifndef OPENMESH_CIRCULATORS_HH
50 #define OPENMESH_CIRCULATORS_HH
51 //=============================================================================
52 //
53 // Vertex and Face circulators for PolyMesh/TriMesh
54 //
55 //=============================================================================
56 
57 
58 
59 //== INCLUDES =================================================================
60 
61 #include <OpenMesh/Core/System/config.h>
62 #include <cassert>
63 #include <cstddef>
64 #include <iterator>
65 
66 //== NAMESPACES ===============================================================
67 
68 namespace OpenMesh {
69 namespace Iterators {
70 
71 template<class Mesh, class CenterEntityHandle, bool CW>
73  public:
74  static void increment(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter);
75  static void decrement(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter);
76 };
77 
78 template<class Mesh>
79 class GenericCirculator_CenterEntityFnsT<Mesh, typename Mesh::VertexHandle, true> {
80  public:
81  inline static void increment(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
82  heh = mesh->cw_rotated_halfedge_handle(heh);
83  if (heh == start) ++lap_counter;
84  }
85  inline static void decrement(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
86  if (heh == start) --lap_counter;
87  heh = mesh->ccw_rotated_halfedge_handle(heh);
88  }
89 };
90 
91 template<class Mesh>
92 class GenericCirculator_CenterEntityFnsT<Mesh, typename Mesh::FaceHandle, true> {
93  public:
94  inline static void increment(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
95  heh = mesh->next_halfedge_handle(heh);
96  if (heh == start) ++lap_counter;
97  }
98  inline static void decrement(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
99  if (heh == start) --lap_counter;
100  heh = mesh->prev_halfedge_handle(heh);
101  }
102 };
103 
105 // CCW
106 
107 template<class Mesh>
108 class GenericCirculator_CenterEntityFnsT<Mesh, typename Mesh::VertexHandle, false> {
109  public:
110  inline static void increment(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
111  heh = mesh->ccw_rotated_halfedge_handle(heh);
112  if (heh == start) ++lap_counter;
113  }
114  inline static void decrement(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
115  if (heh == start) --lap_counter;
116  heh = mesh->cw_rotated_halfedge_handle(heh);
117  }
118 };
119 
120 template<class Mesh>
121 class GenericCirculator_CenterEntityFnsT<Mesh, typename Mesh::FaceHandle, false> {
122  public:
123  inline static void increment(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
124  heh = mesh->prev_halfedge_handle(heh);
125  if (heh == start) ++lap_counter;
126  }
127  inline static void decrement(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
128  if (heh == start) --lap_counter;
129  heh = mesh->next_halfedge_handle(heh);
130  }
131 };
133 
134 template<class Mesh, class CenterEntityHandle, class ValueHandle>
136  public:
137  //inline static bool isDereferenciable(const Mesh *mesh, const typename Mesh::HalfedgeHandle &heh, const typename Mesh::HalfedgeHandle &start, const int &lap_counter);
138 };
139 
140 template<class Mesh>
141 class GenericCirculator_DereferenciabilityCheckT<Mesh, typename Mesh::FaceHandle, typename Mesh::FaceHandle> {
142  public:
143  inline static bool isDereferenciable(const Mesh *mesh, const typename Mesh::HalfedgeHandle &heh) {
144  return mesh->face_handle(mesh->opposite_halfedge_handle(heh)).is_valid();
145  }
146 };
147 
148 template<class Mesh>
149 class GenericCirculator_DereferenciabilityCheckT<Mesh, typename Mesh::VertexHandle, typename Mesh::FaceHandle> {
150  public:
151  inline static bool isDereferenciable(const Mesh *mesh, const typename Mesh::HalfedgeHandle &heh) {
152  return mesh->face_handle(heh).is_valid();
153  }
154 };
155 
156 template<class Mesh, class CenterEntityHandle, class ValueHandle, bool CW = true>
158  public:
159  inline static bool is_valid(const typename Mesh::HalfedgeHandle &heh, const int lap_counter) {
160  return ( heh.is_valid() && (lap_counter == 0 ) );
161  }
162  inline static void init(const Mesh*, typename Mesh::HalfedgeHandle&, typename Mesh::HalfedgeHandle&, int&) {};
163  inline static void increment(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
165  }
166  inline static void decrement(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
168  }
169 };
170 
171 template<class Mesh, class CenterEntityHandle, bool CW>
172 class GenericCirculator_ValueHandleFnsT<Mesh, CenterEntityHandle, typename Mesh::FaceHandle, CW> {
173  public:
175 
176  inline static bool is_valid(const typename Mesh::HalfedgeHandle &heh, const int lap_counter) {
177  return ( heh.is_valid() && (lap_counter == 0));
178  }
179  inline static void init(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
180  if (heh.is_valid() && !GenericCirculator_DereferenciabilityCheck::isDereferenciable(mesh, heh) && lap_counter == 0 )
181  increment(mesh, heh, start, lap_counter);
182  };
183  inline static void increment(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
184  do {
186  } while (is_valid(heh, lap_counter) && !GenericCirculator_DereferenciabilityCheck::isDereferenciable(mesh, heh));
187  }
188  inline static void decrement(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
189  do {
191  } while (is_valid(heh, lap_counter) && !GenericCirculator_DereferenciabilityCheck::isDereferenciable(mesh, heh));
192  }
193 };
194 
195 template<class Mesh>
197  public:
198  typedef const Mesh* mesh_ptr;
199  typedef const Mesh& mesh_ref;
200 
201  public:
202  GenericCirculatorBaseT() : mesh_(0), lap_counter_(0) {}
203 
204  GenericCirculatorBaseT(mesh_ref mesh, HalfedgeHandle heh, bool end = false) :
205  mesh_(&mesh), start_(heh), heh_(heh), lap_counter_(static_cast<int>(end && heh.is_valid())) {}
206 
208  mesh_(rhs.mesh_), start_(rhs.start_), heh_(rhs.heh_), lap_counter_(rhs.lap_counter_) {}
209 
210  inline typename Mesh::FaceHandle toFaceHandle() const {
211  return mesh_->face_handle(heh_);
212  }
213 
214  inline typename Mesh::FaceHandle toOppositeFaceHandle() const {
215  return mesh_->face_handle(toOppositeHalfedgeHandle());
216  }
217 
218  inline typename Mesh::EdgeHandle toEdgeHandle() const {
219  return mesh_->edge_handle(heh_);
220  }
221 
222  inline typename Mesh::HalfedgeHandle toHalfedgeHandle() const {
223  return heh_;
224  }
225 
226  inline typename Mesh::HalfedgeHandle toOppositeHalfedgeHandle() const {
227  return mesh_->opposite_halfedge_handle(heh_);
228  }
229 
230  inline typename Mesh::VertexHandle toVertexHandle() const {
231  return mesh_->to_vertex_handle(heh_);
232  }
233 
234  inline GenericCirculatorBaseT &operator=(const GenericCirculatorBaseT &rhs) {
235  mesh_ = rhs.mesh_;
236  start_ = rhs.start_;
237  heh_ = rhs.heh_;
238  lap_counter_ = rhs.lap_counter_;
239  return *this;
240  }
241 
242  inline bool operator==(const GenericCirculatorBaseT &rhs) const {
243  return mesh_ == rhs.mesh_ && start_ == rhs.start_ && heh_ == rhs.heh_ && lap_counter_ == rhs.lap_counter_;
244  }
245 
246  inline bool operator!=(const GenericCirculatorBaseT &rhs) const {
247  return !operator==(rhs);
248  }
249 
250  protected:
251  mesh_ptr mesh_;
252  typename Mesh::HalfedgeHandle start_, heh_;
253  int lap_counter_;
254 };
255 
256 template<class Mesh, class CenterEntityHandle, class ValueHandle,
257  ValueHandle (GenericCirculatorBaseT<Mesh>::*Handle2Value)() const, bool CW = true >
259  public:
260  typedef std::ptrdiff_t difference_type;
261  typedef ValueHandle value_type;
262  typedef const value_type& reference;
263  typedef const value_type* pointer;
264  typedef std::bidirectional_iterator_tag iterator_category;
265 
266  typedef typename GenericCirculatorBaseT<Mesh>::mesh_ptr mesh_ptr;
267  typedef typename GenericCirculatorBaseT<Mesh>::mesh_ref mesh_ref;
269 
270  public:
271  GenericCirculatorT() {}
272  GenericCirculatorT(mesh_ref mesh, CenterEntityHandle start, bool end = false) :
273  GenericCirculatorBaseT<Mesh>(mesh, mesh.halfedge_handle(start), end) {
274 
275  GenericCirculator_ValueHandleFns::init(this->mesh_, this->heh_, this->start_, this->lap_counter_);
276  }
277  GenericCirculatorT(mesh_ref mesh, HalfedgeHandle heh, bool end = false) :
278  GenericCirculatorBaseT<Mesh>(mesh, heh, end) {
279 
280  GenericCirculator_ValueHandleFns::init(this->mesh_, this->heh_, this->start_, this->lap_counter_);
281  }
283 
287 
288  GenericCirculatorT& operator++() {
289  assert(this->mesh_);
290  GenericCirculator_ValueHandleFns::increment(this->mesh_, this->heh_, this->start_, this->lap_counter_);
291  return *this;
292  }
293  GenericCirculatorT& operator--() {
294  assert(this->mesh_);
295  GenericCirculator_ValueHandleFns::decrement(this->mesh_, this->heh_, this->start_, this->lap_counter_);
296  return *this;
297  }
298 
301  assert(this->mesh_);
302  GenericCirculatorT cpy(*this);
303  ++(*this);
304  return cpy;
305  }
306 
309  assert(this->mesh_);
310  GenericCirculatorT cpy(*this);
311  --(*this);
312  return cpy;
313  }
314 
316  value_type operator*() const {
317 #ifndef NDEBUG
318  assert(this->heh_.is_valid());
319  value_type res = (this->*Handle2Value)();
320  assert(res.is_valid());
321  return res;
322 #else
323  return (this->*Handle2Value)();
324 #endif
325  }
326 
335  pointer operator->() const {
336  pointer_deref_value = **this;
337  return &pointer_deref_value;
338  }
339 
340  GenericCirculatorT &operator=(const GenericCirculatorT &rhs) {
342  return *this;
343  };
344 
345  bool operator==(const GenericCirculatorT &rhs) const {
346  return GenericCirculatorBaseT<Mesh>::operator==(rhs);
347  }
348 
349  bool operator!=(const GenericCirculatorT &rhs) const {
350  return GenericCirculatorBaseT<Mesh>::operator!=(rhs);
351  }
352 
353  bool is_valid() const {
354  return GenericCirculator_ValueHandleFns::is_valid(this->heh_, this->lap_counter_);
355  }
356 
357  template<typename STREAM>
358  friend STREAM &operator<< (STREAM &s, const GenericCirculatorT &self) {
359  return s << self.mesh_ << ", " << self.start_.idx() << ", " << self.heh_.idx() << ", " << self.lap_counter_;
360  }
361 
362  private:
363  mutable value_type pointer_deref_value;
364 };
365 
370 // OLD CIRCULATORS
371 // deprecated circulators, will be removed soon
372 // if you remove these circulators and go to the old ones, PLEASE ENABLE FOLLOWING UNITTESTS:
373 //
374 // OpenMeshTrimeshCirculatorVertexIHalfEdge.VertexIHalfEdgeIterCheckInvalidationAtEnds
375 // OpenMeshTrimeshCirculatorVertexEdge.VertexEdgeIterCheckInvalidationAtEnds
376 // OpenMeshTrimeshCirculatorVertexVertex.VertexVertexIterCheckInvalidationAtEnds
377 // OpenMeshTrimeshCirculatorVertexOHalfEdge.VertexOHalfEdgeIterCheckInvalidationAtEnds
378 // OpenMeshTrimeshCirculatorVertexFace.VertexFaceIterCheckInvalidationAtEnds
379 // OpenMeshTrimeshCirculatorVertexFace.VertexFaceIterWithoutHolesDecrement
380 // OpenMeshTrimeshCirculatorFaceEdge.FaceEdgeIterCheckInvalidationAtEnds
381 // OpenMeshTrimeshCirculatorFaceFace.FaceFaceIterCheckInvalidationAtEnds
382 // OpenMeshTrimeshCirculatorFaceHalfEdge.FaceHalfedgeIterWithoutHolesIncrement
383 // OpenMeshTrimeshCirculatorFaceVertex.FaceVertexIterCheckInvalidationAtEnds
384 // OpenMeshTrimeshCirculatorFaceHalfEdge.FaceHalfedgeIterCheckInvalidationAtEnds
385 //
386 
387 template<class Mesh, class CenterEntityHandle, class ValueHandle>
389  public:
390  inline static bool is_valid(const typename Mesh::HalfedgeHandle &heh,const typename Mesh::HalfedgeHandle &start, const int lap_counter) {
391  return ( heh.is_valid() && ((start != heh) || (lap_counter == 0 )) );
392  }
393  inline static void init(const Mesh*, typename Mesh::HalfedgeHandle&, typename Mesh::HalfedgeHandle&, int&) {};
394  inline static void increment(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
396  }
397  inline static void decrement(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
399  }
400 };
401 
402 template<class Mesh, class CenterEntityHandle>
404  public:
406 
407  inline static bool is_valid(const typename Mesh::HalfedgeHandle &heh, const typename Mesh::HalfedgeHandle &start, const int lap_counter) {
408  return ( heh.is_valid() && ((start != heh) || (lap_counter == 0 )));
409  }
410  inline static void init(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
411  if (heh.is_valid() && !GenericCirculator_DereferenciabilityCheck::isDereferenciable(mesh, heh) && lap_counter == 0 )
412  increment(mesh, heh, start, lap_counter);
413  };
414  inline static void increment(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
415  do {
417  } while (is_valid(heh, start, lap_counter) && !GenericCirculator_DereferenciabilityCheck::isDereferenciable(mesh, heh));
418  }
419  inline static void decrement(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
420  do {
422  } while (is_valid(heh, start, lap_counter) && !GenericCirculator_DereferenciabilityCheck::isDereferenciable(mesh, heh));
423  }
424 };
425 
426 template<class Mesh, class CenterEntityHandle, class ValueHandle,
427  ValueHandle (GenericCirculatorBaseT<Mesh>::*Handle2Value)() const>
429  public:
430  typedef std::ptrdiff_t difference_type;
431  typedef ValueHandle value_type;
432  typedef const value_type& reference;
433  typedef const value_type* pointer;
434  typedef std::bidirectional_iterator_tag iterator_category;
435 
436  typedef typename GenericCirculatorBaseT<Mesh>::mesh_ptr mesh_ptr;
437  typedef typename GenericCirculatorBaseT<Mesh>::mesh_ref mesh_ref;
439 
440  public:
442  GenericCirculatorT_DEPRECATED(mesh_ref mesh, CenterEntityHandle start, bool end = false) :
443  GenericCirculatorBaseT<Mesh>(mesh, mesh.halfedge_handle(start), end) {
444 
445  GenericCirculator_ValueHandleFns::init(this->mesh_, this->heh_, this->start_, this->lap_counter_);
446  }
447  GenericCirculatorT_DEPRECATED(mesh_ref mesh, HalfedgeHandle heh, bool end = false) :
448  GenericCirculatorBaseT<Mesh>(mesh, heh, end) {
449 
450  GenericCirculator_ValueHandleFns::init(this->mesh_, this->heh_, this->start_, this->lap_counter_);
451  }
453 
454  GenericCirculatorT_DEPRECATED& operator++() {
455  assert(this->mesh_);
456  GenericCirculator_ValueHandleFns::increment(this->mesh_, this->heh_, this->start_, this->lap_counter_);
457  return *this;
458  }
459 #ifndef NO_DECREMENT_DEPRECATED_WARNINGS
460 #define DECREMENT_DEPRECATED_WARNINGS_TEXT "The current decrement operator has the unintended behavior that it stays\
461  valid when iterating below the start and will visit the first entity\
462  twice before getting invalid. Furthermore it gets valid again, if you\
463  increment at the end.\
464  When you are sure that you don't iterate below the start anywhere in\
465  your code or rely on this behaviour, you can disable this warning by\
466  setting the define NO_DECREMENT_DEPRECATED_WARNINGS at the command line (or enable it via the\
467  cmake flags).\
468  To be save, you can use the CW/CCW circulator definitions, which behave\
469  the same as the original ones, without the previously mentioned issues."
470 
471  DEPRECATED( DECREMENT_DEPRECATED_WARNINGS_TEXT )
472 #endif // NO_DECREMENT_DEPRECATED_WARNINGS
473  GenericCirculatorT_DEPRECATED& operator--() {
474  assert(this->mesh_);
475  GenericCirculator_ValueHandleFns::decrement(this->mesh_, this->heh_, this->start_, this->lap_counter_);
476  return *this;
477  }
478 
481  assert(this->mesh_);
483  ++(*this);
484  return cpy;
485  }
486 
488 #ifndef NO_DECREMENT_DEPRECATED_WARNINGS
489  DEPRECATED( DECREMENT_DEPRECATED_WARNINGS_TEXT )
490 #undef DECREMENT_DEPRECATED_WARNINGS_TEXT
491 #endif //NO_DECREMENT_DEPRECATED_WARNINGS
493  assert(this->mesh_);
495  --(*this);
496  return cpy;
497  }
498 
500  value_type operator*() const {
501 #ifndef NDEBUG
502  assert(this->heh_.is_valid());
503  value_type res = (this->*Handle2Value)();
504  assert(res.is_valid());
505  return res;
506 #else
507  return (this->*Handle2Value)();
508 #endif
509  }
510 
519  pointer operator->() const {
520  pointer_deref_value = **this;
521  return &pointer_deref_value;
522  }
523 
526  return *this;
527  };
528 
529  bool operator==(const GenericCirculatorT_DEPRECATED &rhs) const {
530  return GenericCirculatorBaseT<Mesh>::operator==(rhs);
531  }
532 
533  bool operator!=(const GenericCirculatorT_DEPRECATED &rhs) const {
534  return GenericCirculatorBaseT<Mesh>::operator!=(rhs);
535  }
536 
537  bool is_valid() const {
538  return GenericCirculator_ValueHandleFns::is_valid(this->heh_,this->start_, this->lap_counter_);
539  }
540 
541  DEPRECATED("current_halfedge_handle() is an implementation detail and should not be accessed from outside the iterator class.")
547  const HalfedgeHandle &current_halfedge_handle() const {
548  return this->heh_;
549  }
550 
551  DEPRECATED("Do not use this error prone implicit cast. Compare to end-iterator or use is_valid(), instead.")
557  operator bool() const {
558  return is_valid();
559  }
560 
566  DEPRECATED("This function clutters your code. Use dereferencing operators -> and * instead.")
567  value_type handle() const {
568  return **this;
569  }
570 
577  DEPRECATED("Implicit casts of iterators are unsafe. Use dereferencing operators -> and * instead.")
578  operator value_type() const {
579  return **this;
580  }
581 
582  template<typename STREAM>
583  friend STREAM &operator<< (STREAM &s, const GenericCirculatorT_DEPRECATED &self) {
584  return s << self.mesh_ << ", " << self.start_.idx() << ", " << self.heh_.idx() << ", " << self.lap_counter_;
585  }
586 
587  private:
588  mutable value_type pointer_deref_value;
589 };
590 
591 } // namespace Iterators
592 } // namespace OpenMesh
593 
594 #endif
value_type operator*() const
Standard dereferencing operator.
Definition: CirculatorsT.hh:316
pointer operator->() const
Pointer dereferentiation.
Definition: CirculatorsT.hh:519
GenericCirculatorT operator++(int)
Post-increment.
Definition: CirculatorsT.hh:300
GenericCirculatorT_DEPRECATED operator--(int)
Post-decrement.
Definition: CirculatorsT.hh:492
bool is_valid() const
The handle is valid iff the index is not equal to -1.
Definition: Handles.hh:77
GenericCirculatorT operator--(int)
Post-decrement.
Definition: CirculatorsT.hh:308
std::ostream & operator<<(std::ostream &_os, const BaseHandle &_hnd)
Write handle _hnd to stream _os.
Definition: Handles.hh:113
Handle for a vertex entity.
Definition: Handles.hh:123
pointer operator->() const
Pointer dereferentiation.
Definition: CirculatorsT.hh:335
Definition: CirculatorsT.hh:258
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition: MeshItems.hh:64
Handle for a halfedge entity.
Definition: Handles.hh:130
value_type operator*() const
Standard dereferencing operator.
Definition: CirculatorsT.hh:500
GenericCirculatorT_DEPRECATED operator++(int)
Post-increment.
Definition: CirculatorsT.hh:480
Definition: CirculatorsT.hh:196
Handle for a face entity.
Definition: Handles.hh:144

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