3 * Interface to relations between expressions. */
6 * GiNaC Copyright (C) 1999-2000 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__
29 #ifndef NO_NAMESPACE_GINAC
31 #endif // ndef NO_NAMESPACE_GINAC
33 /** This class holds a relation consisting of two expressions and a logical
34 * relation between them. */
35 class relational : public basic
37 GINAC_DECLARE_REGISTERED_CLASS(relational, basic)
41 enum operators { equal,
51 // default constructor, destructor, copy constructor assignment operator and helpers
55 relational(const relational & other);
56 const relational & operator=(const relational & other);
58 void copy(const relational & other);
59 void destroy(bool call_parent);
63 relational(const ex & lhs, const ex & rhs, operators oper=equal);
65 // functions overriding virtual functions from bases classes
67 basic * duplicate() const;
68 void print(ostream & os, unsigned upper_precedence=0) const;
69 void printraw(ostream & os) const;
70 void printcsrc(ostream & os, unsigned type, unsigned upper_precedence=0) const;
71 bool info(unsigned inf) const;
72 unsigned nops() const;
74 ex eval(int level=0) const;
75 ex evalf(int level=0) const;
76 ex simplify_ncmul(const exvector & v) const;
78 int compare_same_type(const basic & other) const;
79 unsigned return_type(void) const;
80 unsigned return_type_tinfo(void) const;
82 // new virtual functions which can be overridden by derived classes
84 virtual ex lhs(void) const;
85 virtual ex rhs(void) const;
87 // non-virtual functions in this class
89 operator bool(void) const;
97 static unsigned precedence;
102 extern const relational some_relational;
103 extern const type_info & typeid_relational;
106 inline const relational &ex_to_relational(const ex &e)
108 return static_cast<const relational &>(*e.bp);
111 #ifndef NO_NAMESPACE_GINAC
113 #endif // ndef NO_NAMESPACE_GINAC
115 #endif // ndef __GINAC_RELATIONAL_H__