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// Copyright (C) 2006-2008 Anders Logg.
// Licensed under the GNU LGPL Version 2.1.
//
// Modified by Johan Hoffman, 2007.
//
// First added: 2006-05-22
// Last changed: 2008-05-21
#ifndef __MESH_FUNCTION_H
#define __MESH_FUNCTION_H
#include <dolfin/common/types.h>
#include <dolfin/io/File.h>
#include "MeshEntity.h"
#include <dolfin/main/MPI.h>
#include "MPIMeshCommunicator.h"
namespace dolfin
{
class MPIManager;
/// A MeshFunction is a function that can be evaluated at a set of
/// mesh entities. A MeshFunction is discrete and is only defined
/// at the set of mesh entities of a fixed topological dimension.
/// A MeshFunction may for example be used to store a global
/// numbering scheme for the entities of a (parallel) mesh, marking
/// sub domains or boolean markers for mesh refinement.
template <class T> class MeshFunction
{
public:
/// Create empty mesh function
MeshFunction() : _values(0), _mesh(0), _dim(0), _size(0) {}
/// Create empty mesh function on given mesh
MeshFunction(Mesh& mesh) : _values(0), _mesh(&mesh), _dim(0), _size(0) {}
/// Create mesh function on given mesh of given dimension
MeshFunction(Mesh& mesh, uint dim) : _values(0), _mesh(&mesh), _dim(0), _size(0)
{
init(dim);
}
/// Create function from data file
MeshFunction(Mesh& mesh, const std::string filename) : _values(0), _mesh(&mesh), _dim(0), _size(0)
{
File file(filename);
file >> *this;
}
/// Destructor
~MeshFunction()
{
delete [] _values;
}
/// Return mesh associated with mesh function
inline Mesh& mesh() { dolfin_assert(_mesh); return *_mesh; }
/// Return topological dimension
inline uint dim() const { return _dim; }
/// Return size (number of entities)
inline uint size() const { return _size; }
/// Return array of values
inline const T* values() const { return _values; }
/// Return array of values
inline T* values() { return _values; }
/// Return value at given entity
inline T& operator() (MeshEntity& entity)
{
// FIXME: Removed temporarily, to get parallel assembly working
//dolfin_assert(&entity.mesh() == _mesh);
dolfin_assert(_values);
dolfin_assert(entity.dim() == _dim);
dolfin_assert(entity.index() < _size);
return _values[entity.index()];
}
/// Return value at given entity
inline const T& operator() (MeshEntity& entity) const
{
dolfin_assert(_values);
dolfin_assert(&entity.mesh() == _mesh);
dolfin_assert(entity.dim() == _dim);
dolfin_assert(entity.index() < _size);
return _values[entity.index()];
}
/// Set all values to given value
const MeshFunction<T>& operator= (const T& value)
{
dolfin_assert(_values);
for (uint i = 0; i < _size; i++)
_values[i] = value;
return *this;
}
/// Initialize mesh function for given topological dimension
void init(uint dim)
{
if (!_mesh)
error("Mesh has not been specified, unable to initialize mesh function.");
_mesh->init(dim);
init(*_mesh, dim, _mesh->size(dim));
}
/// Initialize mesh function for given topological dimension of given size
void init(uint dim, uint size)
{
if (!_mesh)
error("Mesh has not been specified, unable to initialize mesh function.");
_mesh->init(dim);
init(*_mesh, dim, size);
}
/// Initialize mesh function for given topological dimension
void init(Mesh& mesh, uint dim)
{
mesh.init(dim);
init(mesh, dim, mesh.size(dim));
}
/// Initialize mesh function for given topological dimension of given size
void init(Mesh& mesh, uint dim, uint size)
{
// Initialize mesh for entities of given dimension
mesh.init(dim);
dolfin_assert(mesh.size(dim) == size);
// Initialize data
_mesh = &mesh;
_dim = dim;
_size = size;
delete [] _values;
_values = new T[size];
std::fill(_values, _values + size, static_cast<T>(0));
}
/// Get value at given entity
inline T get(const MeshEntity& entity) const
{
dolfin_assert(_values);
dolfin_assert(&entity.mesh() == _mesh);
dolfin_assert(entity.dim() == _dim);
dolfin_assert(entity.index() < _size);
return _values[entity.index()];
}
/// Get value at given entity
inline T get(uint index) const
{
dolfin_assert(_values);
dolfin_assert(index < _size);
return _values[index];
}
/// Set value at given entity
inline void set(const MeshEntity& entity, const T& value)
{
dolfin_assert(_values);
dolfin_assert(&entity.mesh() == _mesh);
dolfin_assert(entity.dim() == _dim);
dolfin_assert(entity.index() < _size);
_values[entity.index()] = value;
}
/// Set value at given entity
inline void set(uint index, const T& value)
{
dolfin_assert(_values);
dolfin_assert(index < _size);
_values[index] = value;
}
/// Display mesh function data
void disp() const
{
cout << "Mesh function data" << endl;
cout << "------------------" << endl;
begin("");
cout << "Topological dimension: " << _dim << endl;
cout << "Number of values: " << _size << endl;
cout << endl;
for (uint i = 0; i < _size; i++)
cout << "(" << _dim << ", " << i << "): " << _values[i] << endl;
end();
}
private:
friend class MPIMeshCommunicator;
/// Values at the set of mesh entities
T* _values;
/// The mesh
Mesh* _mesh;
/// Topological dimension
uint _dim;
/// Number of mesh entities
uint _size;
};
}
#endif
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