3 * Interface to GiNaC's constant types and some special constants. */
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_CONSTANT_H__
24 #define __GINAC_CONSTANT_H__
27 #include <ginac/basic.h>
31 /** This class holds constants, symbols with specific numerical value. Each
32 * object of this class must either provide their own function to evaluate it
33 * to class numeric or provide the constant as a numeric (if it's an exact
35 class constant : public basic
40 // default constructor, destructor, copy constructor assignment operator and helpers
43 constant(constant const & other);
44 // constant const & operator=(constant const & other); /* it's pervert! */
46 void copy(constant const & other);
47 void destroy(bool call_parent);
51 constant(string const & initname, ex (*efun)()=0);
52 constant(string const & initname, numeric const & initnumber);
54 // functions overriding virtual functions from bases classes
56 basic * duplicate() const;
57 void printraw(ostream & os) const;
58 void print(ostream & os, unsigned upper_precedence=0) const;
59 void printcsrc(ostream & os, unsigned type, unsigned upper_precedence=0) const;
60 ex evalf(int level=0) const;
61 ex diff(symbol const & s) const;
63 int compare_same_type(basic const & other) const;
64 bool is_equal_same_type(basic const & other) const;
66 // new virtual functions which can be overridden by derived classes
69 // non-virtual functions in this class
79 unsigned serial; //!< unique serial number for comparision
80 static unsigned next_serial;
85 extern const constant some_constant;
86 extern type_info const & typeid_constant;
88 // extern const numeric I;
89 extern const constant Pi;
90 extern const constant Catalan;
91 extern const constant EulerGamma;
95 #endif // ndef __GINAC_CONSTANT_H__