/usr/include/ginac/expair.h is in libginac-dev 1.6.2-1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 | /** @file expair.h
*
* Definition of expression pairs (building blocks of expairseq). */
/*
* GiNaC Copyright (C) 1999-2011 Johannes Gutenberg University Mainz, Germany
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef GINAC_EXPAIR_H
#define GINAC_EXPAIR_H
#include "ex.h"
#include "numeric.h"
#include "print.h"
namespace GiNaC {
/** A pair of expressions.
* This is similar to STL's pair<>. It is slightly extended since we need to
* account for methods like .compare(). Also, since this is meant for use by
* class expairseq it must satisfy the invariance that the member coeff must
* be of type numeric. */
class expair
{
public:
expair() : rest(0), coeff(1) { }
/** Construct an expair from two ex. */
expair(const ex & r, const ex & c) : rest(r), coeff(c)
{
GINAC_ASSERT(is_exactly_a<numeric>(coeff));
}
/** Member-wise check for canonical ordering equality. */
bool is_equal(const expair & other) const
{
return (rest.is_equal(other.rest) && coeff.is_equal(other.coeff));
}
/** Member-wise check for canonical ordering lessness. */
bool is_less(const expair & other) const
{
int restcmp = rest.compare(other.rest);
return ((restcmp<0) ||
(!(restcmp>0) && (coeff.compare(other.coeff)<0)));
}
/** Member-wise check for canonical ordering. */
int compare(const expair & other) const
{
int restcmp = rest.compare(other.rest);
if (restcmp!=0)
return restcmp;
else
return coeff.compare(other.coeff);
}
void print(std::ostream & os) const;
/** True if this is of the form (numeric,ex(1)). */
bool is_canonical_numeric() const
{
GINAC_ASSERT(is_exactly_a<numeric>(coeff));
return (is_exactly_a<numeric>(rest) && (coeff.is_equal(1)));
}
/** Swap contents with other expair. */
void swap(expair & other)
{
rest.swap(other.rest);
coeff.swap(other.coeff);
}
const expair conjugate() const;
ex rest; ///< first member of pair, an arbitrary expression
ex coeff; ///< second member of pair, must be numeric
};
/** Function object for insertion into third argument of STL's sort() etc. */
struct expair_is_less : public std::binary_function<expair, expair, bool> {
bool operator()(const expair &lh, const expair &rh) const { return lh.is_less(rh); }
};
/** Function object not caring about the numerical coefficients for insertion
* into third argument of STL's sort(). Note that this does not define a
* strict weak ordering since for any symbol x we have neither 3*x<2*x or
* 2*x<3*x. Handle with care! */
struct expair_rest_is_less : public std::binary_function<expair, expair, bool> {
bool operator()(const expair &lh, const expair &rh) const { return (lh.rest.compare(rh.rest)<0); }
};
struct expair_swap : public std::binary_function<expair, expair, void> {
void operator()(expair &lh, expair &rh) const { lh.swap(rh); }
};
inline void swap(expair & e1, expair & e2)
{ e1.swap(e2); }
// This makes STL algorithms use the more efficient swap operation for ex objects
inline void iter_swap(std::vector<expair>::iterator i1, std::vector<expair>::iterator i2)
{ i1->swap(*i2); }
} // namespace GiNaC
#endif // ndef GINAC_EXPAIR_H
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