/usr/include/dolfin/mesh/MeshEntity.h is in libdolfin-dev 2016.2.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// This file is part of DOLFIN.
//
// DOLFIN is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// DOLFIN is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with DOLFIN. If not, see <http://www.gnu.org/licenses/>.
//
// Modified by Andre Massing, 2009.
// Modified by Garth N. Wells, 2012.
//
// First added: 2006-05-11
// Last changed: 2014-07-02
#ifndef __MESH_ENTITY_H
#define __MESH_ENTITY_H
#include <cmath>
#include <iostream>
#include <dolfin/geometry/Point.h>
#include "Mesh.h"
namespace dolfin
{
//class Mesh;
class Point;
/// A MeshEntity represents a mesh entity associated with
/// a specific topological dimension of some _Mesh_.
class MeshEntity
{
public:
/// Default Constructor
MeshEntity() : _mesh(0), _dim(0), _local_index(0) {}
/// Constructor
///
/// *Arguments*
/// mesh (_Mesh_)
/// The mesh.
/// dim (std::size_t)
/// The topological dimension.
/// index (std::size_t)
/// The index.
MeshEntity(const Mesh& mesh, std::size_t dim, std::size_t index);
/// Destructor
virtual ~MeshEntity();
/// Initialize mesh entity with given data
///
/// *Arguments*
/// mesh (_Mesh_)
/// The mesh.
/// dim (std::size_t)
/// The topological dimension.
/// index (std::size_t)
/// The index.
void init(const Mesh& mesh, std::size_t dim, std::size_t index);
/// Comparison Operator
///
/// *Arguments*
/// another (_MeshEntity_)
/// Another mesh entity
///
/// *Returns*
/// bool
/// True if the two mesh entities are equal.
bool operator==(const MeshEntity& e) const
{
return (_mesh == e._mesh && _dim == e._dim
&& _local_index == e._local_index);
}
/// Comparison Operator
///
/// *Arguments*
/// another (MeshEntity)
/// Another mesh entity.
///
/// *Returns*
/// bool
/// True if the two mesh entities are NOT equal.
bool operator!=(const MeshEntity& e) const
{ return !operator==(e); }
/// Return mesh associated with mesh entity
///
/// *Returns*
/// _Mesh_
/// The mesh.
const Mesh& mesh() const
{ return *_mesh; }
/// Return topological dimension
///
/// *Returns*
/// std::size_t
/// The dimension.
std::size_t dim() const
{ return _dim; }
/// Return index of mesh entity
///
/// *Returns*
/// std::size_t
/// The index.
std::size_t index() const
{ return _local_index; }
/// Return global index of mesh entity
///
/// *Returns*
/// std::size_t
/// The global index. Set to
/// std::numerical_limits<std::size_t>::max() if global index
/// has not been computed
std::int64_t global_index() const
{
const std::vector<std::int64_t>& global_indices
= _mesh->topology().global_indices(_dim);
if (global_indices.empty())
return -1;
return global_indices[_local_index];
}
/// Return local number of incident mesh entities of given
/// topological dimension
///
/// *Arguments*
/// dim (std::size_t)
/// The topological dimension.
///
/// *Returns*
/// std::size_t
/// The number of local incident MeshEntity objects of given
/// dimension.
std::size_t num_entities(std::size_t dim) const
{ return _mesh->topology()(_dim, dim).size(_local_index); }
/// Return global number of incident mesh entities of given
/// topological dimension
///
/// *Arguments*
/// dim (std::size_t)
/// The topological dimension.
///
/// *Returns*
/// std::size_t
/// The number of global incident MeshEntity objects of given
/// dimension.
std::size_t num_global_entities(std::size_t dim) const
{ return _mesh->topology()(_dim, dim).size_global(_local_index); }
/// Return array of indices for incident mesh entities of given
/// topological dimension
///
/// *Arguments*
/// dim (std::size_t)
/// The topological dimension.
///
/// *Returns*
/// std::size_t
/// The index for incident mesh entities of given dimension.
const unsigned int* entities(std::size_t dim) const
{
const unsigned int* initialized_mesh_entities
= _mesh->topology()(_dim, dim)(_local_index);
dolfin_assert(initialized_mesh_entities);
return initialized_mesh_entities;
}
/// Return unique mesh ID
///
/// *Returns*
/// std::size_t
/// The unique mesh ID.
std::size_t mesh_id() const
{ return _mesh->id(); }
/// Check if given entity is incident
///
/// *Arguments*
/// entity (_MeshEntity_)
/// The entity.
///
/// *Returns*
/// bool
/// True if the given entity is incident
bool incident(const MeshEntity& entity) const;
/// Compute local index of given incident entity (error if not
/// found)
///
/// *Arguments*
/// entity (_MeshEntity_)
/// The mesh entity.
///
/// *Returns*
/// std::size_t
/// The local index of given entity.
std::size_t index(const MeshEntity& entity) const;
/// Compute midpoint of cell
///
/// *Returns*
/// _Point_
/// The midpoint of the cell.
Point midpoint() const;
/// Determine whether an entity is a 'ghost' from another
/// process
bool is_ghost() const
{ return (_local_index >= _mesh->topology().ghost_offset(_dim)); }
/// Return set of sharing processes
std::set<unsigned int> sharing_processes() const
{
const std::map<std::int32_t, std::set<unsigned int>>& sharing_map
= _mesh->topology().shared_entities(_dim);
const auto map_it = sharing_map.find(_local_index);
if (map_it == sharing_map.end())
return std::set<unsigned int>();
else
return map_it->second;
}
/// Determine if an entity is shared or not
bool is_shared() const
{
if (_mesh->topology().have_shared_entities(_dim))
{
const std::map<std::int32_t, std::set<unsigned int>>& sharing_map
= _mesh->topology().shared_entities(_dim);
return (sharing_map.find(_local_index) != sharing_map.end());
}
return false;
}
/// Get ownership of this entity - only really valid for cells
unsigned int owner() const;
// Note: Not a subclass of Variable for efficiency!
/// Return informal string representation (pretty-print)
///
/// *Arguments*
/// verbose (bool)
/// Flag to turn on additional output.
///
/// *Returns*
/// std::string
/// An informal representation of the function space.
std::string str(bool verbose) const;
protected:
// Friends
friend class MeshEntityIterator;
template<typename T> friend class MeshEntityIteratorBase;
friend class SubsetIterator;
// The mesh
Mesh const * _mesh;
// Topological dimension
std::size_t _dim;
// Local index of entity within topological dimension
std::size_t _local_index;
};
}
#endif
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