/usr/include/libmesh/periodic_boundaries.h is in libmesh-dev 0.7.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// The libMesh Finite Element Library.
// Copyright (C) 2002-2008 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
// This library 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 2.1 of the License, or (at your option) any later version.
// This library 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 this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#ifndef __periodic_boundaries_h__
#define __periodic_boundaries_h__
// ------------------------------------------------------------
// Periodic boundary conditions information
// Local Includes -----------------------------------
#include "libmesh_config.h"
#ifdef LIBMESH_ENABLE_PERIODIC
// C++ Includes -----------------------------------
#include <map>
#include <set>
// Local Includes -----------------------------------
#include "point.h"
#include "vector_value.h" // RealVectorValue
#include "libmesh.h" // libMesh::invalid_uint
namespace libMesh {
// Forward Declarations
class Elem;
class MeshBase;
/**
* The definition of a periodic boundary.
*/
class PeriodicBoundary
{
public:
// The boundary ID of this boundary and it's counterpart
unsigned int myboundary,
pairedboundary;
PeriodicBoundary() :
myboundary(libMesh::invalid_uint),
pairedboundary(libMesh::invalid_uint),
translation_vector()
{
}
virtual ~PeriodicBoundary() {}
PeriodicBoundary(const PeriodicBoundary & o, bool inverse = false) :
myboundary(o.myboundary),
pairedboundary(o.pairedboundary),
translation_vector(o.translation_vector),
variables(o.variables)
{
if (inverse)
{
std::swap(myboundary, pairedboundary);
translation_vector *= -1.0;
}
}
PeriodicBoundary(const RealVectorValue & vector) :
myboundary(libMesh::invalid_uint),
pairedboundary(libMesh::invalid_uint),
translation_vector (vector)
{
}
virtual Point get_corresponding_pos(const Point & pt) const
{
return pt + translation_vector;
}
void set_variable(unsigned int var)
{
variables.insert(var);
}
void merge(const PeriodicBoundary & pb)
{
variables.insert(pb.variables.begin(), pb.variables.end());
}
bool is_my_variable(unsigned int var_num) const
{
bool a = variables.empty() || (!variables.empty() && variables.find(var_num) != variables.end());
return a;
}
protected:
// One of these days we'll support rotated boundaries
// RealTensor rotation_matrix;
// The vector which is added to points in myboundary
// to produce corresponding points in pairedboundary
RealVectorValue translation_vector;
// Set of variables for this periodiv boundary, empty means all varaibles possible
std::set<unsigned int> variables;
};
/**
* The constraint matrix storage format.
* We're using a class instead of a typedef to allow forward
* declarations and future flexibility. Is there some issue with
* deriving from standard containers, i.e. don't do it because they
* don't have virtual destructors?
*/
class PeriodicBoundaries : public std::map<unsigned int, PeriodicBoundary *>
{
public:
PeriodicBoundary *boundary(unsigned int id);
const PeriodicBoundary *boundary(unsigned int id) const;
PeriodicBoundaries() {}
~PeriodicBoundaries();
// The periodic neighbor of \p e in direction \p side, if it
// exists. NULL otherwise
const Elem *neighbor(unsigned int boundary_id,
const PointLocatorBase &point_locator,
const Elem *e,
unsigned int side) const;
private:
};
// ------------------------------------------------------------
// PeriodicBoundary inline member functions
inline
PeriodicBoundary *
PeriodicBoundaries::boundary(unsigned int id)
{
iterator i = this->find(id);
if (i == this->end())
return NULL;
return i->second;
}
inline
const PeriodicBoundary *
PeriodicBoundaries::boundary(unsigned int id) const
{
const_iterator i = this->find(id);
if (i == this->end())
return NULL;
return i->second;
}
} // namespace libMesh
#endif // LIBMESH_ENABLE_PERIODIC
#endif // __periodic_boundaries_h__
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