/usr/include/linbox/util/prime-stream.h is in liblinbox-dev 1.3.2-1.1+b1.
This file is owned by root:root, with mode 0o644.
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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 | /* linbox/randiter/primes.h
* Copyright (C) 2002 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========
*.
*
* Stream of prime numbers
*/
#ifndef __LINBOX_prime_stream_H
#define __LINBOX_prime_stream_H
#include "linbox/integer.h"
#include <sys/time.h>
#include <stdlib.h>
namespace LinBox
{
/** Prime number stream
*
* Provides a source of prime numbers of given characteristics to use in parts
* of the library that need to reduce modulo one or more primes.
**/
template <class Element>
class PrimeStream {
public:
/** Constructor
*
* Construct a PrimeStream object.
* @param start Starting point; need not be prime itself
* @param move_up true if we should move up from the starting point, false otherwise
*/
PrimeStream (Integer &start, bool move_up = true) :
_curr (start), _move_up (move_up)
{}
~PrimeStream ()
{}
/** Get the next prime element
*
* @param a Place to store the next prime element
* @return Reference to next prime element
*/
Element &next (Element &a)
{
/** @warning LinBox::Integer does not support prevprime */
#if 0
if (_move_up == true) {
nextprime (_curr, _curr);
a = _curr;
_curr += 2L;
}
else {
prevprime (_curr, _curr);
a = _curr;
_curr -= 2L;
}
#endif
nextprime (_curr, _curr);
a = _curr;
_curr += 2L;
return a;
}
/** Operator form for getting the next prime element
*/
PrimeStream<Element> &operator >> (Element &a)
{ next (a); return *this; }
private:
Integer _curr;
bool _move_up;
}; // class PrimeStream
} // namespace LinBox
#endif // __LINBOX_prime_stream_H
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