OpenMesh
Handles.hh
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41 
42 
43 
44 #ifndef OPENMESH_HANDLES_HH
45 #define OPENMESH_HANDLES_HH
46 
47 
48 //== INCLUDES =================================================================
49 
50 #include <OpenMesh/Core/System/config.h>
51 #include <ostream>
52 
53 
54 //== NAMESPACES ===============================================================
55 
56 namespace OpenMesh {
57 
58 //== CLASS DEFINITION =========================================================
59 
60 
63 {
64 public:
65 
66  explicit BaseHandle(int _idx=-1) : idx_(_idx) {}
67 
69  int idx() const { return idx_; }
70 
72  bool is_valid() const { return idx_ >= 0; }
73 
75  void reset() { idx_=-1; }
77  void invalidate() { idx_ = -1; }
78 
79  bool operator==(const BaseHandle& _rhs) const {
80  return (this->idx_ == _rhs.idx_);
81  }
82 
83  bool operator!=(const BaseHandle& _rhs) const {
84  return (this->idx_ != _rhs.idx_);
85  }
86 
87  bool operator<(const BaseHandle& _rhs) const {
88  return (this->idx_ < _rhs.idx_);
89  }
90 
91 
92  // this is to be used only by the iterators
93  void __increment() { ++idx_; }
94  void __decrement() { --idx_; }
95 
96  void __increment(int amount) { idx_ += amount; }
97  void __decrement(int amount) { idx_ -= amount; }
98 
99 private:
100 
101  int idx_;
102 };
103 
104 // this is used by boost::unordered_set/map
105 inline size_t hash_value(const BaseHandle& h) { return h.idx(); }
106 
107 //-----------------------------------------------------------------------------
108 
110 inline std::ostream& operator<<(std::ostream& _os, const BaseHandle& _hnd)
111 {
112  return (_os << _hnd.idx());
113 }
114 
115 
116 //-----------------------------------------------------------------------------
117 
118 
120 struct VertexHandle : public BaseHandle
121 {
122  explicit VertexHandle(int _idx=-1) : BaseHandle(_idx) {}
123 };
124 
125 
127 struct HalfedgeHandle : public BaseHandle
128 {
129  explicit HalfedgeHandle(int _idx=-1) : BaseHandle(_idx) {}
130 };
131 
132 
134 struct EdgeHandle : public BaseHandle
135 {
136  explicit EdgeHandle(int _idx=-1) : BaseHandle(_idx) {}
137 };
138 
139 
141 struct FaceHandle : public BaseHandle
142 {
143  explicit FaceHandle(int _idx=-1) : BaseHandle(_idx) {}
144 };
145 
146 
147 //=============================================================================
148 } // namespace OpenMesh
149 //=============================================================================
150 
151 #ifdef OM_HAS_HASH
152 #include <functional>
153 namespace std {
154 
155 #if defined(_MSVC_VER)
156 # pragma warning(push)
157 # pragma warning(disable:4099) // For VC++ it is class hash
158 #endif
159 
160 
161 template <>
162 struct hash<OpenMesh::BaseHandle >
163 {
164  typedef OpenMesh::BaseHandle argument_type;
165  typedef std::size_t result_type;
166 
167  std::size_t operator()(const OpenMesh::BaseHandle& h) const
168  {
169  return h.idx();
170  }
171 };
172 
173 template <>
174 struct hash<OpenMesh::VertexHandle >
175 {
176  typedef OpenMesh::VertexHandle argument_type;
177  typedef std::size_t result_type;
178 
179  std::size_t operator()(const OpenMesh::VertexHandle& h) const
180  {
181  return h.idx();
182  }
183 };
184 
185 template <>
186 struct hash<OpenMesh::HalfedgeHandle >
187 {
188 
189  typedef OpenMesh::HalfedgeHandle argument_type;
190  typedef std::size_t result_type;
191 
192  std::size_t operator()(const OpenMesh::HalfedgeHandle& h) const
193  {
194  return h.idx();
195  }
196 };
197 
198 template <>
199 struct hash<OpenMesh::EdgeHandle >
200 {
201 
202  typedef OpenMesh::EdgeHandle argument_type;
203  typedef std::size_t result_type;
204 
205  std::size_t operator()(const OpenMesh::EdgeHandle& h) const
206  {
207  return h.idx();
208  }
209 };
210 
211 template <>
212 struct hash<OpenMesh::FaceHandle >
213 {
214 
215  typedef OpenMesh::FaceHandle argument_type;
216  typedef std::size_t result_type;
217 
218  std::size_t operator()(const OpenMesh::FaceHandle& h) const
219  {
220  return h.idx();
221  }
222 };
223 
224 #if defined(_MSVC_VER)
225 # pragma warning(pop)
226 #endif
227 
228 }
229 #endif // OM_HAS_HASH
230 
231 
232 #endif // OPENMESH_HANDLES_HH
233 //=============================================================================
void invalidate()
reset handle to be invalid
Definition: Handles.hh:77
auto operator<<(std::ostream &os, const VectorT< Scalar, DIM > &_vec) -> typename std::enable_if< sizeof(decltype(os<< _vec[0])) >=0
output a vector by printing its space-separated compontens
Handle for a halfedge entity.
Definition: Handles.hh:127
Handle for a vertex entity.
Definition: Handles.hh:120
Handle for a edge entity.
Definition: Handles.hh:134
STL namespace.
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition: MeshItems.hh:59
void reset()
reset handle to be invalid
Definition: Handles.hh:75
Handle for a face entity.
Definition: Handles.hh:141
int idx() const
Get the underlying index of this handle.
Definition: Handles.hh:69
bool is_valid() const
The handle is valid iff the index is not negative.
Definition: Handles.hh:72
Base class for all handle types.
Definition: Handles.hh:62

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