3 * Interface to relations between expressions. */
6 * GiNaC Copyright (C) 1999 Johannes Gutenberg University Mainz, Germany
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #ifndef __GINAC_RELATIONAL_H__
24 #define __GINAC_RELATIONAL_H__
26 #include <ginac/basic.h>
31 /** This class holds a relation consisting of two expressions and a logical
32 * relation between them. */
33 class relational : public basic
38 enum operators { equal,
48 // default constructor, destructor, copy constructor assignment operator and helpers
52 relational(relational const & other);
53 relational const & operator=(relational const & other);
55 void copy(relational const & other);
56 void destroy(bool call_parent);
60 relational(ex const & lhs, ex const & rhs, operators oper=equal);
62 // functions overriding virtual functions from bases classes
64 basic * duplicate() const;
65 void printraw(ostream & os) const;
66 void print(ostream & os, unsigned upper_precedence=0) const;
67 void printcsrc(ostream & os, unsigned type, unsigned upper_precedence=0) const;
68 bool info(unsigned inf) const;
70 ex & let_op(int const i);
71 ex eval(int level=0) const;
72 ex evalf(int level=0) const;
73 ex simplify_ncmul(exvector const & v) const;
75 int compare_same_type(basic const & other) const;
76 unsigned return_type(void) const;
77 unsigned return_type_tinfo(void) const;
79 // new virtual functions which can be overridden by derived classes
82 // non-virtual functions in this class
84 operator bool(void) const;
92 static unsigned precedence;
97 extern const relational some_relational;
98 extern type_info const & typeid_relational;
101 inline const relational &ex_to_relational(const ex &e)
103 return static_cast<const relational &>(*e.bp);
108 #endif // ndef __GINAC_RELATIONAL_H__