/usr/include/linbox/switch/cekstv-gf2.h is in liblinbox-dev 1.3.2-1.1build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 | /* linbox/switch/cekstv.h
* Copyright (C) 1999-2001 William J Turner
*
* Written by William J Turner <wjturner@math.ncsu.edu>
*
* -----------------------------------------------------------
* 2002-09-26 Bradford Hovinen <bghovinen@math.uwaterloo.ca>
*
* Refactoring: The switch object now contains only the information for one 2x2
* block. A vector of switches is maintained by the butterfly preconditioner
* instead of the switch object. Since there will be many switch objects, they
* should be kept very lightweight, so the field is not maintained in the object
* itself, but instead passed to apply and applyTranspose. Since those methods
* are inline, this does not create overhead. apply and applyTranspose now take
* four field elements: the source elements and destination elements. This
* eliminates the need to keep an additional temporary in the class, and
* eliminates the need for copying in the butterfly.
*
* -----------------------------------------------------------
* 2002-08-20 Bradford Hovinen <hovinen@cis.udel.edu>
*
* Brought this file into the current Linbox framework:
* - Renamed file as cekstv.h
* - Renamed class cekstv_switch as CekstvSwitch
* - Reindent
* -----------------------------------------------------------
*
*
* ========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_cekstv_gf2_H
#define __LINBOX_cekstv_gf2_H
#include <vector>
#include "linbox/field/gf2.h"
#include "linbox/switch/cekstv.h"
namespace LinBox
{
// Specialization of Butterfly switch object
template <>
class CekstvSwitch<GF2>
{
public:
typedef GF2 Field;
/// Typedef
typedef Field::Element Element;
typedef CekstvSwitch<Field> Self_t;
typedef CekstvSwitchFactory<Field> Factory;
/** Constructor from a field and a field element.
* @param F field in which arithmetic is done
* @param switches vector of switches
*/
CekstvSwitch (const Field::Element &a) :
_a (a)
{}
~CekstvSwitch () {}
bool apply (const Field &F, Element &x, Element &y) const
{
F.axpyin (x, _a, y);
F.addin (y, x);
return true;
}
bool applyTranspose (const Field &F, Element &x, Element &y) const
{
F.addin (x, y);
F.axpyin (y, _a, x);
return true;
}
bool apply (const Field &F, stdBitReference x, stdBitReference y) const
{
F.axpyin (x, _a, y);
F.addin (y, x);
return true;
}
bool applyTranspose (const Field &F, stdBitReference x, stdBitReference y) const
{
F.addin (x, y);
F.axpyin (y, _a, x);
return true;
}
template<typename _Tp1>
struct rebind
{
typedef CekstvSwitch<_Tp1> other;
// special rebind operator() with two fields,
// indeed local field is not stored in the switch
void operator() (other *& Ap, const Self_t& A, const _Tp1& T, const Field& F) {
typename _Tp1::Element u;
Hom<Field, _Tp1>(F,T).image(u, A._a);
Ap = new other(u);
}
};
private:
// Parameter of this 2x2 block
Field::Element _a;
};
} // namespace LinBox
#endif // __LINBOX_cekstv_H
// vim:sts=8:sw=8:ts=8:noet:sr:cino=>s,f0,{0,g0,(0,:0,t0,+0,=s
// Local Variables:
// mode: C++
// tab-width: 8
// indent-tabs-mode: nil
// c-basic-offset: 8
// End:
|