/usr/include/pynac/relational.h is in libpynac-dev 0.3.2+dfsg-1.
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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 | /** @file relational.h
*
* Interface to relations between expressions. */
/*
* GiNaC Copyright (C) 1999-2008 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_RELATIONAL_H__
#define __GINAC_RELATIONAL_H__
#include "basic.h"
#include "ex.h"
namespace GiNaC {
/** This class holds a relation consisting of two expressions and a logical
* relation between them. */
class relational : public basic
{
GINAC_DECLARE_REGISTERED_CLASS(relational, basic)
// types
public:
enum operators {
equal,
not_equal,
less,
less_or_equal,
greater,
greater_or_equal
};
// other constructors
public:
relational(const ex & lhs, const ex & rhs, operators oper=equal);
// functions overriding virtual functions from base classes
public:
unsigned precedence() const {return 20;}
bool info(unsigned inf) const;
size_t nops() const;
ex op(size_t i) const;
ex map(map_function & f) const;
ex subs(const exmap & m, unsigned options = 0) const;
ex eval(int level=0) const;
protected:
ex eval_ncmul(const exvector & v) const;
bool match_same_type(const basic & other) const;
unsigned return_type() const;
tinfo_t return_type_tinfo() const;
unsigned calchash() const;
// new virtual functions which can be overridden by derived classes
protected:
void print_rel(const print_context & c, unsigned level, bool latex) const;
void do_print_dflt(const print_context & c, unsigned level) const;
void do_print_latex(const print_context & c, unsigned level) const;
void do_print_python_repr(const print_python_repr & c, unsigned level) const;
public:
virtual ex lhs() const;
virtual ex rhs() const;
virtual operators the_operator() const;
// non-virtual functions in this class
private:
// For conversions to boolean, as would be used in an if conditional,
// implicit conversions from bool to int have a large number of
// undesirable side effects. The following safe_bool type enables
// use of relational objects in conditionals without those side effects
struct safe_bool_helper {
void nonnull() {};
};
typedef void (safe_bool_helper::*safe_bool)();
safe_bool make_safe_bool(bool) const;
public:
operator safe_bool() const;
safe_bool operator!() const;
// member variables
protected:
ex lh;
ex rh;
operators o;
};
// utility functions
// inlined functions for efficiency
inline relational::safe_bool relational::operator!() const
{
return make_safe_bool(!static_cast<bool>(*this));
}
} // namespace GiNaC
#endif // ndef __GINAC_RELATIONAL_H__
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