/usr/include/linbox/blackbox/transpose.h is in liblinbox-dev 1.4.2-5build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2001 Bradford Hovinen
*
* Written by Bradford Hovinen <hovinen@cis.udel.edu>
*
* ========LICENCE========
* This file is part of the library LinBox.
*
* LinBox 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* ========LICENCE========
*/
#ifndef __LINBOX_transpose_H
#define __LINBOX_transpose_H
#include "linbox/util/error.h"
#include "linbox/blackbox/blackbox-interface.h"
namespace LinBox
{
template <class Blackbox>
class Transpose;
template <class Blackbox>
class TransposeOwner;
}
// Namespace in which all LinBox library code resides
namespace LinBox
{
/** \brief transpose matrix without copying.
\ingroup blackbox
* @param Vector \ref LinBox dense or sparse vector of field elements
* @bug no write here. test-blackbox.h requires it
*/
template <class Blackbox>
class Transpose : public BlackboxInterface {
public:
typedef Blackbox Blackbox_t;
typedef Transpose<Blackbox> Self_t;
typedef typename Blackbox::Field Field;
typedef typename Blackbox::Element Element;
/** Constructor from a black box.
* This constructor creates a matrix that is the transpose of a black box
* matrix A
* @param A pointer to black box matrix.
*/
Transpose (Blackbox& A) :
_A_ptr(&A)
{}
Transpose (const Blackbox& A) :
_A_ptr(&A)
{}
Transpose (const Blackbox *A_ptr) :
_A_ptr(A_ptr)
{
}
/** Copy constructor.
* @param Mat constant reference to compose black box matrix
*/
Transpose (const Transpose<Blackbox> &Mat) :
_A_ptr(Mat._A_ptr)
{
// create new copies of matrices in dynamic memory
//linbox_check (M._A_ptr != NULL);
//_A_ptr = M._A_ptr->clone ();
}
/// Destructor
~Transpose (void)
{
}
template<typename _Tp1>
struct rebind {
typedef TransposeOwner<typename Blackbox_t::template rebind<_Tp1>::other> other;
void operator() (other & Ap, const Self_t& A)
{
typename Blackbox_t::template rebind<_Tp1> () ( Ap.getData(), *(A.getPtr()));
}
};
/** Application of BlackBox matrix.
* <code>y= (A*B)*x</code>.
* Requires one vector conforming to the \ref LinBox
* vector @link Archetypes archetype@endlink.
* Required by abstract base class.
* @return reference to vector y containing output.
* @param x constant reference to vector to contain input
* @param y
*/
template <class Vector1, class Vector2>
inline Vector1 &apply (Vector1 &y, const Vector2 &x) const
{
if (_A_ptr != 0) _A_ptr->applyTranspose (y, x);
return y;
}
/** Application of BlackBox matrix transpose.
* <code>y= transpose(A*B)*x</code>.
* Requires one vector conforming to the \ref LinBox
* vector @link Archetypes archetype@endlink.
* Required by abstract base class.
* @return reference to vector y containing output.
* @param x constant reference to vector to contain input
* @param y
*/
template <class Vector1, class Vector2>
inline Vector1 &applyTranspose (Vector1 &y, const Vector2 &x) const
{
if (_A_ptr != 0) _A_ptr->apply (y, x);
return y;
}
/** Retreive row dimensions of BlackBox matrix.
* This may be needed for applying preconditioners.
* Required by abstract base class.
* @return integer number of rows of black box matrix.
*/
size_t rowdim (void) const
{
if (_A_ptr != 0)
return _A_ptr->coldim ();
else
return 0;
}
/** Retreive column dimensions of BlackBox matrix.
* Required by abstract base class.
* @return integer number of columns of black box matrix.
*/
size_t coldim (void) const
{
if (_A_ptr != 0)
return _A_ptr->rowdim ();
else
return 0;
}
const Field& field() const {return _A_ptr->field();}
// accessors to the blackboxes
const Blackbox* getPtr() const {return _A_ptr;}
Element& getEntry(Element& x, size_t i, size_t j) const
{
return _A_ptr->getEntry(x, j, i);
}
void setEntry(size_t i, size_t j, const Element& x)
{
const_cast<Blackbox_t*>(_A_ptr)->setEntry( j, i, x);
}
std::ostream &write(std::ostream & os) const {
return _A_ptr->write(os << "transpose of:");
}
std::istream &read(std::istream & is) {
throw LinboxError("you don't want to call read here");
return is;
}
protected:
// Pointers to the matrix
const Blackbox *_A_ptr;
}; // template <Vector> class Transpose
} // namespace LinBox
namespace LinBox
{
/** \brief transpose matrix without copying.
\ingroup blackbox
* @param Vector \ref LinBox dense or sparse vector of field elements
*/
template <class Blackbox>
class TransposeOwner : public BlackboxInterface {
public:
typedef Blackbox Blackbox_t;
typedef TransposeOwner<Blackbox> Self_t;
typedef typename Blackbox::Field Field;
typedef typename Blackbox::Element Element;
/** Constructor from a black box.
* This constructor creates a matrix that is the transpose of a black box
* matrix A
*/
TransposeOwner (const Blackbox& A) :
_A_data(A)
{}
TransposeOwner (const Blackbox *A_data) :
_A_data(*A_data)
{ }
/** Copy constructor.
* @param Mat constant reference to compose black box matrix
*/
TransposeOwner (const TransposeOwner<Blackbox> &Mat) :
_A_data(Mat.getData())
{
#if 0
create new copies of matrices in dynamic memory
linbox_check (M.getData() != NULL);
_A_data = M.getData().clone ();
#endif
}
/// Destructor
~TransposeOwner (void)
{
}
template<typename _Tp1>
struct rebind {
typedef TransposeOwner<typename Blackbox::template rebind<_Tp1>::other> other;
void operator() (other & Ap, const Self_t& A)
{
typename Blackbox_t::template rebind<_Tp1> () ( Ap.getData(), A.getData());
}
};
template<typename _BB, class Field>
TransposeOwner (const Transpose<_BB>& T, const Field& F) :
_A_data(*(T.getPtr()), F)
{
typename Transpose<_BB>::template rebind<Field>()(*this,T);
}
template<typename _BB, class Field>
TransposeOwner (const TransposeOwner<_BB>& T, const Field& F) :
_A_data(T.getData(), F)
{
typename TransposeOwner<_BB>::template rebind<Field>()(*this,T);
}
/** Application of BlackBox matrix.
* <code>y= (A*B)*x</code>.
* Requires one vector conforming to the \ref LinBox
* vector @link Archetypes archetype@endlink.
* Required by abstract base class.
* @return reference to vector y containing output.
* @param x constant reference to vector to contain input
* @param y
*/
template <class Vector1, class Vector2>
inline Vector1 &apply (Vector1 &y, const Vector2 &x) const
{
return _A_data.applyTranspose (y, x);
}
/** Application of BlackBox matrix transpose.
* <code>y= transpose(A*B)*x</code>.
* Requires one vector conforming to the \ref LinBox
* vector @link Archetypes archetype@endlink.
* Required by abstract base class.
* @return reference to vector y containing output.
* @param x constant reference to vector to contain input
* @param y
*/
template <class Vector1, class Vector2>
inline Vector1 &applyTranspose (Vector1 &y, const Vector2 &x) const
{
return _A_data.apply (y, x);
}
/** Retreive row dimensions of BlackBox matrix.
* This may be needed for applying preconditioners.
* Required by abstract base class.
* @return integer number of rows of black box matrix.
*/
size_t rowdim (void) const
{
return _A_data.coldim ();
}
/** Retreive column dimensions of BlackBox matrix.
* Required by abstract base class.
* @return integer number of columns of black box matrix.
*/
size_t coldim (void) const
{
return _A_data.rowdim ();
}
const Field& field() const {return _A_data.field();}
// accessors to the blackboxes without ownership
const Blackbox& getData() const {return _A_data;}
Blackbox& getData() {return _A_data;}
private:
// Takes ownership of the data
Blackbox _A_data;
};
} // namespace LinBox
#endif // __LINBOX_transpose_H
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