3 * Interface to GiNaC's symbolic objects. */
6 * GiNaC Copyright (C) 1999-2005 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_SYMBOL_H__
24 #define __GINAC_SYMBOL_H__
33 /** Basic CAS symbol. It has a name because it must know how to output itself.
34 * It may be assigned an expression, but this feature is only intended for
35 * programs like 'ginsh' that want to associate symbols with expressions.
36 * If you want to replace symbols by expressions in your code, you should
37 * use ex::subs() or use objects of class ex instead of class symbol in the
39 class symbol : public basic
41 GINAC_DECLARE_REGISTERED_CLASS(symbol, basic)
43 friend class realsymbol;
47 /** Symbols as keys to expressions - only for ginsh. */
48 class assigned_ex_info : public refcounted {
50 assigned_ex_info() throw(); ///< Default ctor
51 bool is_assigned; ///< True if there is an expression assigned
52 ex assigned_expression; ///< The actual expression
59 explicit symbol(const std::string & initname, unsigned domain = domain::complex);
60 symbol(const std::string & initname, const std::string & texname, unsigned domain = domain::complex);
61 symbol(const std::string & initname, unsigned rt, unsigned rtt, unsigned domain = domain::complex);
62 symbol(const std::string & initname, const std::string & texname, unsigned rt, unsigned rtt, unsigned domain = domain::complex);
64 // functions overriding virtual functions from base classes
66 bool info(unsigned inf) const;
67 ex eval(int level = 0) const;
68 ex evalf(int level = 0) const { return *this; } // overwrites basic::evalf() for performance reasons
69 ex series(const relational & s, int order, unsigned options = 0) const;
70 ex subs(const exmap & m, unsigned options = 0) const { return subs_one_level(m, options); } // overwrites basic::subs() for performance reasons
71 ex normal(exmap & repl, exmap & rev_lookup, int level = 0) const;
72 ex to_rational(exmap & repl) const;
73 ex to_polynomial(exmap & repl) const;
74 unsigned return_type() const { return ret_type; }
75 unsigned return_type_tinfo() const { return ret_type_tinfo; }
78 ex derivative(const symbol & s) const;
79 bool is_equal_same_type(const basic & other) const;
80 unsigned calchash() const;
82 // non-virtual functions in this class
84 void assign(const ex & value);
86 void set_name(const std::string & n) { name = n; }
87 std::string get_name() const { return name; }
88 unsigned get_domain() const { return domain; }
90 void do_print(const print_context & c, unsigned level) const;
91 void do_print_latex(const print_latex & c, unsigned level) const;
92 void do_print_tree(const print_tree & c, unsigned level) const;
93 void do_print_python_repr(const print_python_repr & c, unsigned level) const;
95 std::string & autoname_prefix();
96 std::string default_TeX_name() const;
101 ptr<assigned_ex_info> asexinfop; ///< assigned expression, only for private use by ginsh
102 unsigned serial; ///< unique serial number for comparison
103 std::string name; ///< printname of this symbol
104 std::string TeX_name; ///< LaTeX name of this symbol
105 unsigned domain; ///< domain of symbol, complex (default) or real
106 unsigned ret_type; ///< value returned by return_type()
107 unsigned ret_type_tinfo; ///< value returned by return_type_tinfo()
109 static unsigned next_serial;
113 /** Specialization of symbol to real domain */
114 class realsymbol : public symbol
119 explicit realsymbol(const std::string & initname, unsigned domain = domain::real);
120 realsymbol(const std::string & initname, const std::string & texname, unsigned domain = domain::real);
121 realsymbol(const std::string & initname, unsigned rt, unsigned rtt, unsigned domain = domain::real);
122 realsymbol(const std::string & initname, const std::string & texname, unsigned rt, unsigned rtt, unsigned domain = domain::real);
128 /** Specialization of is_exactly_a<symbol>(obj) for symbol objects. */
129 template<> inline bool is_exactly_a<symbol>(const basic & obj)
131 return obj.tinfo() == TINFO_symbol;
134 /** Specialization of is_exactly_a<realsymbol>(obj) for realsymbol objects. */
135 template<> inline bool is_exactly_a<realsymbol>(const basic & obj)
137 return (obj.tinfo() == TINFO_symbol) && (static_cast<const symbol &>(obj).get_domain() == domain::real);
140 // wrapper functions around member functions
141 inline void unassign(symbol & symarg)
142 { symarg.unassign(); }
146 #endif // ndef __GINAC_SYMBOL_H__