DOLFIN
DOLFIN C++ interface
MeshEntity.h
1 // Copyright (C) 2006-2011 Anders Logg
2 //
3 // This file is part of DOLFIN.
4 //
5 // DOLFIN is free software: you can redistribute it and/or modify
6 // it under the terms of the GNU Lesser General Public License as published by
7 // the Free Software Foundation, either version 3 of the License, or
8 // (at your option) any later version.
9 //
10 // DOLFIN is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 // GNU Lesser General Public License for more details.
14 //
15 // You should have received a copy of the GNU Lesser General Public License
16 // along with DOLFIN. If not, see <http://www.gnu.org/licenses/>.
17 //
18 // Modified by Andre Massing, 2009.
19 // Modified by Garth N. Wells, 2012.
20 //
21 // First added: 2006-05-11
22 // Last changed: 2014-07-02
23 
24 #ifndef __MESH_ENTITY_H
25 #define __MESH_ENTITY_H
26 
27 #include <cmath>
28 #include <iostream>
29 
30 #include <dolfin/geometry/Point.h>
31 #include "Mesh.h"
32 
33 namespace dolfin
34 {
35 
36  //class Mesh;
37  class Point;
38 
41 
42  class MeshEntity
43  {
44  public:
45 
47  MeshEntity() : _mesh(0), _dim(0), _local_index(0) {}
48 
57  MeshEntity(const Mesh& mesh, std::size_t dim, std::size_t index);
58 
60  virtual ~MeshEntity();
61 
70  void init(const Mesh& mesh, std::size_t dim, std::size_t index);
71 
79  bool operator==(const MeshEntity& e) const
80  {
81  return (_mesh == e._mesh && _dim == e._dim
82  && _local_index == e._local_index);
83  }
84 
92  bool operator!=(const MeshEntity& e) const
93  { return !operator==(e); }
94 
99  const Mesh& mesh() const
100  { return *_mesh; }
101 
106  std::size_t dim() const
107  { return _dim; }
108 
113  std::size_t index() const
114  { return _local_index; }
115 
122  std::int64_t global_index() const
123  {
124  const std::vector<std::int64_t>& global_indices
125  = _mesh->topology().global_indices(_dim);
126  if (global_indices.empty())
127  return -1;
128  return global_indices[_local_index];
129  }
130 
140  std::size_t num_entities(std::size_t dim) const
141  { return _mesh->topology()(_dim, dim).size(_local_index); }
142 
152  std::size_t num_global_entities(std::size_t dim) const
153  { return _mesh->topology()(_dim, dim).size_global(_local_index); }
154 
163  const unsigned int* entities(std::size_t dim) const
164  {
165  const unsigned int* initialized_mesh_entities
166  = _mesh->topology()(_dim, dim)(_local_index);
167  dolfin_assert(initialized_mesh_entities);
168  return initialized_mesh_entities;
169  }
170 
175  std::size_t mesh_id() const
176  { return _mesh->id(); }
177 
185  bool incident(const MeshEntity& entity) const;
186 
195  std::size_t index(const MeshEntity& entity) const;
196 
201  Point midpoint() const;
202 
207  bool is_ghost() const
208  { return (_local_index >= _mesh->topology().ghost_offset(_dim)); }
209 
213  std::set<unsigned int> sharing_processes() const
214  {
215  const std::map<std::int32_t, std::set<unsigned int>>& sharing_map
216  = _mesh->topology().shared_entities(_dim);
217  const auto map_it = sharing_map.find(_local_index);
218  if (map_it == sharing_map.end())
219  return std::set<unsigned int>();
220  else
221  return map_it->second;
222  }
223 
227  bool is_shared() const
228  {
229  if (_mesh->topology().have_shared_entities(_dim))
230  {
231  const std::map<std::int32_t, std::set<unsigned int>>& sharing_map
232  = _mesh->topology().shared_entities(_dim);
233  return (sharing_map.find(_local_index) != sharing_map.end());
234  }
235  return false;
236  }
237 
241  unsigned int owner() const;
242 
243  // Note: Not a subclass of Variable for efficiency!
251  std::string str(bool verbose) const;
252 
253  protected:
254 
255  // Friends
256  friend class MeshEntityIterator;
257  template<typename T> friend class MeshEntityIteratorBase;
258  friend class SubsetIterator;
259 
260  // The mesh
261  Mesh const * _mesh;
262 
263  // Topological dimension
264  std::size_t _dim;
265 
266  // Local index of entity within topological dimension
267  std::size_t _local_index;
268 
269  };
270 
271 }
272 
273 #endif
std::int64_t global_index() const
Definition: MeshEntity.h:122
std::map< std::int32_t, std::set< unsigned int > > & shared_entities(unsigned int dim)
Definition: MeshTopology.cpp:186
bool operator==(const MeshEntity &e) const
Definition: MeshEntity.h:79
const Mesh & mesh() const
Definition: MeshEntity.h:99
Definition: SubsetIterator.h:41
bool have_shared_entities(unsigned int dim) const
Definition: MeshTopology.h:123
std::size_t index() const
Definition: MeshEntity.h:113
unsigned int owner() const
Definition: MeshEntity.cpp:146
Definition: adapt.h:29
bool is_ghost() const
Definition: MeshEntity.h:207
Definition: Point.h:40
std::size_t dim() const
Definition: MeshEntity.h:106
std::size_t id() const
Definition: Variable.h:68
std::size_t ghost_offset(std::size_t dim) const
Definition: MeshTopology.cpp:93
Point midpoint() const
Definition: MeshEntity.cpp:115
MeshTopology & topology()
Definition: Mesh.h:219
std::set< unsigned int > sharing_processes() const
Definition: MeshEntity.h:213
Definition: MeshEntityIterator.h:64
std::size_t num_entities(std::size_t dim) const
Definition: MeshEntity.h:140
std::size_t mesh_id() const
Definition: MeshEntity.h:175
std::size_t num_global_entities(std::size_t dim) const
Definition: MeshEntity.h:152
bool incident(const MeshEntity &entity) const
Definition: MeshEntity.cpp:69
void init(const Mesh &mesh, std::size_t dim, std::size_t index)
Definition: MeshEntity.cpp:39
Definition: MeshEntity.h:42
const unsigned int * entities(std::size_t dim) const
Definition: MeshEntity.h:163
virtual ~MeshEntity()
Destructor.
Definition: MeshEntity.cpp:64
std::string str(bool verbose) const
Definition: MeshEntity.cpp:162
bool operator!=(const MeshEntity &e) const
Definition: MeshEntity.h:92
MeshEntity()
Default Constructor.
Definition: MeshEntity.h:47
const std::vector< std::int64_t > & global_indices(std::size_t d) const
Definition: MeshTopology.h:107
bool is_shared() const
Definition: MeshEntity.h:227
Definition: Mesh.h:82
Base class for MeshEntityIterators.
Definition: MeshEntityIteratorBase.h:36