/usr/include/fflas-ffpack/field/nonzero-randiter.h is in fflas-ffpack-common 1.6.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// vim:sts=8:sw=8:ts=8:noet:sr:cino=>s,f0,{0,g0,(0,\:0,t0,+0,=s
/* fflas-ffpack/nonzero-randiter.h
* Copyright (C) 2001-2002 Bradford Hovinen
* 2008 Clement Pernet
* Written by William J Turner <wjturner@math.ncsu.edu>,
* Bradford Hovinen <hovinen@cis.udel.edu>
* Clement Pernet <clement.pernet@gmail.com>
*
* taken for LinBox
*
* ------------------------------------
*
*
* ========LICENCE========
* This file is part of the library FFLAS-FFPACK.
*
* FFLAS-FFPACK 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 __NONZERO_RANDITER_H
#define __NONZERO_RANDITER_H
#include <sys/time.h>
#include <stdlib.h>
#include <string>
namespace FFPACK {
/** Random iterator for nonzero random numbers
*
* Wraps around an existing random iterator and ensures that the output
* is entirely nonzero numbers.
**/
template <class Field, class RandIter = typename Field::RandIter>
class NonzeroRandIter
{
public:
typedef typename Field::Element Element;
NonzeroRandIter (const Field &F, const RandIter &r)
: _F (F), _r (r)
{}
NonzeroRandIter (const NonzeroRandIter& R)
: _F (R._F), _r (R._r) {}
~NonzeroRandIter()
{}
NonzeroRandIter& operator=(const NonzeroRandIter& R)
{
if (this != &R) { // guard against self-assignment
_F = R._F;
_r = R._r;
}
return *this;
}
Element &random (Element &a) const
{
do _r.random (a); while (_F.isZero (a));
return a;
}
private:
Field _F;
RandIter _r;
}; // class NonzeroRandIter
} // FFPACK
#endif // __NONZERO_RANDITER_H
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