/usr/include/dolfin/mesh/LocalMeshValueCollection.h is in libdolfin1.0-dev 1.0.0-1.
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 Anders Logg, 2008-2009.
//
// First added: 2008-11-28
// Last changed: 2011-03-25
//
// Modified by Anders Logg, 2008-2009.
// Modified by Kent-Andre Mardal, 2011.
#ifndef __LOCAL_MESH_VALUE_COLLECTION_H
#define __LOCAL_MESH_VALUE_COLLECTION_H
#include <map>
#include <utility>
#include <vector>
#include <dolfin/common/MPI.h>
#include <dolfin/common/types.h>
#include <dolfin/log/log.h>
namespace dolfin
{
template <typename T> class MeshValueCollection;
/// This class stores mesh data on a local processor corresponding
/// to a portion of a MeshValueCollection.
template <typename T>
class LocalMeshValueCollection
{
public:
/// Create local mesh data for given LocalMeshValueCollection
LocalMeshValueCollection(const MeshValueCollection<T>& values, uint dim);
/// Destructor
~LocalMeshValueCollection() {}
/// Return dimension of cell entity
uint dim () const
{ return _dim; }
/// Return data
const std::vector<std::pair<std::pair<uint, uint>, T> >& values() const
{ return _values; }
private:
/// Topological dimension
const uint _dim;
// MeshValueCollection values (cell_index, local_index), value))
std::vector<std::pair<std::pair<uint, uint>, T> > _values;
};
//---------------------------------------------------------------------------
// Implementation of LocalMeshValueCollection
//---------------------------------------------------------------------------
template <typename T>
LocalMeshValueCollection<T>::LocalMeshValueCollection(const MeshValueCollection<T>& values,
uint dim)
: _dim(dim)
{
// Prepare data
std::vector<std::vector<uint> > send_indices;
std::vector<std::vector<T> > send_v;
// Extract data on main process and split among processes
if (MPI::is_broadcaster())
{
// Get number of processes
const uint num_processes = MPI::num_processes();
send_indices.resize(num_processes);
send_v.resize(num_processes);
const std::map<std::pair<uint, uint>, T>& vals = values.values();
for (uint p = 0; p < num_processes; p++)
{
const std::pair<uint, uint> local_range = MPI::local_range(p, vals.size());
typename std::map<std::pair<uint, uint>, T>::const_iterator it = vals.begin();
std::advance(it, local_range.first);
for (uint i = local_range.first; i < local_range.second; ++i)
{
send_indices[p].push_back(it->first.first);
send_indices[p].push_back(it->first.second);
send_v[p].push_back(it->second);
std::advance(it, 1);
}
}
}
// Scatter data
std::vector<uint> indices;
std::vector<T> v;
MPI::scatter(send_indices, indices);
MPI::scatter(send_v, v);
dolfin_assert(2*v.size() == indices.size());
// Unpack
for (uint i = 0; i < v.size(); ++i)
{
const uint cell_index = indices[2*i];
const uint local_entity_index = indices[2*i + 1];
const T value = v[i];
_values.push_back( std::make_pair( std::make_pair(cell_index, local_entity_index) , value) );
}
}
//---------------------------------------------------------------------------
}
#endif
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