OpenMesh: OpenMesh/Core/Mesh/IteratorsT.hh Source File

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IteratorsT.hh
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47 \*===========================================================================*/
48
49 #ifndef OPENMESH_ITERATORS_HH
50 #define OPENMESH_ITERATORS_HH
51
52 //=============================================================================
53 //
54 // Iterators for PolyMesh/TriMesh
55 //
56 //=============================================================================
57
58
59
60 //== INCLUDES =================================================================
61
62 #include <OpenMesh/Core/System/config.h>
63 #include <OpenMesh/Core/Mesh/Status.hh>
64 #include <cassert>
65 #include <cstddef>
66 #include <iterator>
67
68
69 //== NAMESPACES ===============================================================
70
71 namespace OpenMesh {
72 namespace Iterators {
73
74
75 //== FORWARD DECLARATIONS =====================================================
76
77
78 template <class Mesh> class ConstVertexIterT;
79 template <class Mesh> class VertexIterT;
80 template <class Mesh> class ConstHalfedgeIterT;
81 template <class Mesh> class HalfedgeIterT;
82 template <class Mesh> class ConstEdgeIterT;
83 template <class Mesh> class EdgeIterT;
84 template <class Mesh> class ConstFaceIterT;
85 template <class Mesh> class FaceIterT;
86
87
88 template <class Mesh, class ValueHandle, class MemberOwner, bool (MemberOwner::*PrimitiveStatusMember)() const, size_t (MemberOwner::*PrimitiveCountMember)() const>
89 class GenericIteratorT {
90 public:
91 //--- Typedefs ---
92
93 typedef ValueHandle value_handle;
94 typedef value_handle value_type;
95 typedef std::bidirectional_iterator_tag iterator_category;
96 typedef std::ptrdiff_t difference_type;
97 typedef const value_type& reference;
98 typedef const value_type* pointer;
99 typedef const Mesh* mesh_ptr;
100 typedef const Mesh& mesh_ref;
101
103 GenericIteratorT()
104 : mesh_(0), skip_bits_(0)
105 {}
106
108 GenericIteratorT(mesh_ref _mesh, value_handle _hnd, bool _skip=false)
109 : mesh_(&_mesh), hnd_(_hnd), skip_bits_(0)
110 {
111 if (_skip) enable_skipping();
112 }
113
115 reference operator*() const {
116 return hnd_;
117 }
118
120 pointer operator->() const {
121 return &hnd_;
122 }
123
129 DEPRECATED("This function clutters your code. Use dereferencing operators -> and * instead.")
130 value_handle handle() const {
131 return hnd_;
132 }
133
140 DEPRECATED("Implicit casts of iterators are unsafe. Use dereferencing operators -> and * instead.")
141 operator value_handle() const {
142 return hnd_;
143 }
144
146 bool operator==(const GenericIteratorT& _rhs) const {
147 return ((mesh_ == _rhs.mesh_) && (hnd_ == _rhs.hnd_));
148 }
149
151 bool operator!=(const GenericIteratorT& _rhs) const {
152 return !operator==(_rhs);
153 }
154
156 GenericIteratorT& operator++() {
157 hnd_.__increment();
158 if (skip_bits_)
159 skip_fwd();
160 return *this;
161 }
162
164 GenericIteratorT operator++(int) {
165 GenericIteratorT cpy(*this);
166 ++(*this);
167 return cpy;
168 }
169
170 #if ((defined(_MSC_VER) && (_MSC_VER >= 1800)) || __cplusplus > 199711L || defined(__GXX_EXPERIMENTAL_CXX0X__)) && !defined(OPENMESH_VECTOR_LEGACY)
171 template<class T = value_handle>
172 auto operator+=(int amount) ->
173 typename std::enable_if<
174 sizeof(decltype(std::declval<T>().__increment(amount))) >= 0,
175 GenericIteratorT&>::type {
176 static_assert(std::is_same<T, value_handle>::value,
177 "Template parameter must not deviate from default.");
178 if (skip_bits_)
179 throw std::logic_error("Skipping iterators do not support "
180 "random access.");
181 hnd_.__increment(amount);
182 return *this;
183 }
184
185 template<class T = value_handle>
186 auto operator+(int rhs) ->
187 typename std::enable_if<
188 sizeof(decltype(std::declval<T>().__increment(rhs), void (), int {})) >= 0,
189 GenericIteratorT>::type {
190 static_assert(std::is_same<T, value_handle>::value,
191 "Template parameter must not deviate from default.");
192 if (skip_bits_)
193 throw std::logic_error("Skipping iterators do not support "
194 "random access.");
195 GenericIteratorT result = *this;
196 result.hnd_.__increment(rhs);
197 return result;
198 }
199 #endif
200
202 GenericIteratorT& operator--() {
203 hnd_.__decrement();
204 if (skip_bits_)
205 skip_bwd();
206 return *this;
207 }
208
210 GenericIteratorT operator--(int) {
211 GenericIteratorT cpy(*this);
212 --(*this);
213 return cpy;
214 }
215
217 void enable_skipping() {
218 if (mesh_ && (mesh_->*PrimitiveStatusMember)()) {
219 Attributes::StatusInfo status;
220 status.set_deleted(true);
221 status.set_hidden(true);
222 skip_bits_ = status.bits();
223 skip_fwd();
224 } else
225 skip_bits_ = 0;
226 }
227
229 void disable_skipping() {
230 skip_bits_ = 0;
231 }
232
233 private:
234
235 void skip_fwd() {
236 assert(mesh_ && skip_bits_);
237 while ((hnd_.idx() < (signed) (mesh_->*PrimitiveCountMember)())
238 && (mesh_->status(hnd_).bits() & skip_bits_))
239 hnd_.__increment();
240 }
241
242 void skip_bwd() {
243 assert(mesh_ && skip_bits_);
244 while ((hnd_.idx() >= 0) && (mesh_->status(hnd_).bits() & skip_bits_))
245 hnd_.__decrement();
246 }
247
248 protected:
249 mesh_ptr mesh_;
250 value_handle hnd_;
251 unsigned int skip_bits_;
252 };
253
254 //=============================================================================
255 } // namespace Iterators
256 } // namespace OpenMesh
257 //=============================================================================
258 #endif
259 //=============================================================================
OpenMesh::Attributes::StatusInfo
Add status information to a base class.
Definition: Status.hh:99
OpenMesh::Iterators::GenericIteratorT::operator++
GenericIteratorT & operator++()
Standard pre-increment operator.
Definition: IteratorsT.hh:156
OpenMesh::Iterators::EdgeIterT
Definition: IteratorsT.hh:83
OpenMesh::Iterators::ConstHalfedgeIterT
Definition: IteratorsT.hh:80
OpenMesh::Iterators::GenericIteratorT::operator*
reference operator*() const
Standard dereferencing operator.
Definition: IteratorsT.hh:115
OpenMesh::Iterators::GenericIteratorT::disable_skipping
void disable_skipping()
Turn on skipping: automatically skip deleted/hidden elements.
Definition: IteratorsT.hh:229
OpenMesh::Iterators::ConstEdgeIterT
Definition: IteratorsT.hh:82
OpenMesh::Iterators::ConstFaceIterT
Definition: IteratorsT.hh:84
OpenMesh::Iterators::GenericIteratorT::GenericIteratorT
GenericIteratorT(mesh_ref _mesh, value_handle _hnd, bool _skip=false)
Construct with mesh and a target handle.
Definition: IteratorsT.hh:108
OpenMesh
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition: MeshItems.hh:64
OpenMesh::Iterators::GenericIteratorT::operator++
GenericIteratorT operator++(int)
Standard post-increment operator.
Definition: IteratorsT.hh:164
OpenMesh::Iterators::GenericIteratorT::handle
value_handle handle() const
Get the handle of the item the iterator refers to.
Definition: IteratorsT.hh:130
OpenMesh::Iterators::GenericIteratorT::operator==
bool operator==(const GenericIteratorT &_rhs) const
Are two iterators equal? Only valid if they refer to the same mesh!
Definition: IteratorsT.hh:146
OpenMesh::Attributes::StatusInfo::set_hidden
void set_hidden(bool _b)
set hidden
Definition: Status.hh:128
OpenMesh::Attributes::StatusInfo::set_deleted
void set_deleted(bool _b)
set deleted
Definition: Status.hh:110
OpenMesh::Iterators::GenericIteratorT::operator--
GenericIteratorT operator--(int)
Standard post-decrement operator.
Definition: IteratorsT.hh:210
OpenMesh::Iterators::GenericIteratorT
Definition: IteratorsT.hh:89
OpenMesh::Iterators::GenericIteratorT::GenericIteratorT
GenericIteratorT()
Default constructor.
Definition: IteratorsT.hh:103
OpenMesh::Iterators::VertexIterT
Definition: IteratorsT.hh:79
OpenMesh::Iterators::FaceIterT
Definition: IteratorsT.hh:85
OpenMesh::Iterators::GenericIteratorT::operator->
pointer operator->() const
Standard pointer operator.
Definition: IteratorsT.hh:120
OpenMesh::Iterators::GenericIteratorT::enable_skipping
void enable_skipping()
Turn on skipping: automatically skip deleted/hidden elements.
Definition: IteratorsT.hh:217
OpenMesh::Iterators::GenericIteratorT::operator!=
bool operator!=(const GenericIteratorT &_rhs) const
Not equal?
Definition: IteratorsT.hh:151
OpenMesh::Iterators::GenericIteratorT::operator--
GenericIteratorT & operator--()
Standard pre-decrement operator.
Definition: IteratorsT.hh:202
OpenMesh::Attributes::StatusInfo::bits
unsigned int bits() const
return whole status
Definition: Status.hh:156
OpenMesh::Iterators::HalfedgeIterT
Definition: IteratorsT.hh:81
OpenMesh::Iterators::ConstVertexIterT
Definition: IteratorsT.hh:78