/usr/include/libmesh/dense_subvector.h is in libmesh-dev 0.7.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
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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 __dense_subvector_h__
#define __dense_subvector_h__
// C++ includes
// Local Includes
#include "libmesh_common.h"
#include "dense_vector.h"
namespace libMesh
{
/**
* Defines a dense subvector for use in Finite Element-type computations.
* Useful for storing element load vectors before summation
* into a global vector, particularly when you have systems of equations.
*
* @author Benjamin S. Kirk, 2003
*/
// ------------------------------------------------------------
// DenseSubVector class definition
template<typename T>
class DenseSubVector : public DenseVectorBase<T>
{
public:
/**
* Constructor. Creates a dense subvector of the vector
* \p parent. The subvector has dimensions \f$(m \times n)\f$,
* and the \f$(0,0) entry of the subvector is located
* at the \f$(ioff,joff)\f$ location in the parent vector.
*/
DenseSubVector(DenseVector<T>& parent,
const unsigned int ioff=0,
const unsigned int n=0);
/**
* Destructor. Does nothing.
*/
virtual ~DenseSubVector() {}
/**
* @returns a reference to the parent vector.
*/
DenseVector<T>& parent () { return _parent_vector; }
/**
* Set every element in the subvector to 0.
*/
virtual void zero();
/**
* @returns the \p (i,j) element of the subvector.
*/
T operator() (const unsigned int i) const;
/**
* @returns the \p (i,j) element of the subvector as a writeable reference.
*/
T & operator() (const unsigned int i);
/**
* @returns the \p (i) element of the vector.
*/
virtual T el(const unsigned int i) const { return (*this)(i); }
/**
* @returns the \p (i) element of the vector as a writeable reference.
*/
virtual T & el(const unsigned int i) { return (*this)(i); }
/**
* @returns the size of the subvector.
*/
virtual unsigned int size() const { return _n; }
/**
* @returns the row offset into the parent vector.
*/
unsigned int i_off() const { return _i_off; }
/**
* Changes the location of the subvector in the parent vector.
*/
void reposition(const unsigned int ioff,
const unsigned int n);
private:
/**
* The parent vector that contains this subvector.
*/
DenseVector<T>& _parent_vector;
/**
* The length of this subvector.
*/
unsigned int _n;
/**
* The offset into the parent vector.
*/
unsigned int _i_off;
};
// ------------------------------------------------------------
// Dense Vector member functions
template<typename T>
inline
DenseSubVector<T>::DenseSubVector(DenseVector<T>& parent,
const unsigned int ioff,
const unsigned int n) :
_parent_vector(parent)
{
reposition (ioff, n);
}
template<typename T>
inline
void DenseSubVector<T>::reposition(const unsigned int ioff,
const unsigned int n)
{
_i_off = ioff;
_n = n;
// Make sure we still fit in the parent vector.
libmesh_assert ((this->i_off() + this->size()) <= _parent_vector.size());
}
template<typename T>
inline
void DenseSubVector<T>::zero()
{
for (unsigned int i=0; i<this->size(); i++)
_parent_vector (i + this->i_off()) = 0.;
}
template<typename T>
inline
T DenseSubVector<T>::operator () (const unsigned int i) const
{
libmesh_assert (i < this->size());
libmesh_assert (i + this->i_off() < _parent_vector.size());
return _parent_vector (i + this->i_off());
}
template<typename T>
inline
T & DenseSubVector<T>::operator () (const unsigned int i)
{
libmesh_assert (i < this->size());
libmesh_assert (i + this->i_off() < _parent_vector.size());
return _parent_vector (i + this->i_off());
}
} // namespace libMesh
#endif // #ifndef __dense_vector_h__
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