Possbility for positive symbols/numbers.

[ginac.git] / ginac / symbol.h

diff --git a/ginac/symbol.h b/ginac/symbol.h
index 450a2df43deac6dec1f710e96662eec91ae4bc3b..90013144ccd5d7f88e28a280055b54c814c193df 100644 (file)
--- a/ginac/symbol.h
+++ b/ginac/symbol.h
@@ -3,7 +3,7 @@
  *  Interface to GiNaC's symbolic objects. */
 
 /*
- *  GiNaC Copyright (C) 1999-2003 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2006 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
@@ -17,7 +17,7 @@
  *
  *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 #ifndef __GINAC_SYMBOL_H__
@@ -40,25 +40,27 @@ class symbol : public basic
 {
        GINAC_DECLARE_REGISTERED_CLASS(symbol, basic)
 
+       friend class realsymbol;
+
 // types
        
        /** Symbols as keys to expressions - only for ginsh. */
-       class assigned_ex_info {
-               friend class ptr<assigned_ex_info>;
+       class assigned_ex_info : public refcounted {
        public:
-               assigned_ex_info();     ///< Default ctor
-               bool is_assigned;       ///< True if there is an expression assigned
-               ex assigned_expression; ///< The actual expression
-       private:
-               size_t refcount;        ///< Reference counter, managed by ptr<assigned_ex_info>
+               assigned_ex_info() throw();  ///< Default ctor
+               bool is_assigned;            ///< True if there is an expression assigned
+               ex assigned_expression;      ///< The actual expression
        };
 
 // member functions
        
        // other constructors
 public:
-       explicit symbol(const std::string & initname);
-       explicit symbol(const std::string & initname, const std::string & texname);
+       explicit symbol(const std::string & initname, unsigned domain = domain::complex);
+       symbol(const std::string & initname, const std::string & texname, unsigned domain = domain::complex);
+       symbol(const std::string & initname, const std::string & texname, unsigned rt, unsigned domain);
+       symbol(const std::string & initname, unsigned rt, tinfo_t rtt, unsigned domain = domain::complex);
+       symbol(const std::string & initname, const std::string & texname, unsigned rt, tinfo_t rtt, unsigned domain = domain::complex);
        
        // functions overriding virtual functions from base classes
 public:
@@ -68,8 +70,14 @@ public:
        ex series(const relational & s, int order, unsigned options = 0) const;
        ex subs(const exmap & m, unsigned options = 0) const { return subs_one_level(m, options); } // overwrites basic::subs() for performance reasons
        ex normal(exmap & repl, exmap & rev_lookup, int level = 0) const;
-       ex to_rational(lst &repl_lst) const;
-       ex to_polynomial(lst &repl_lst) const;
+       ex to_rational(exmap & repl) const;
+       ex to_polynomial(exmap & repl) const;
+       unsigned return_type() const { return ret_type; }
+       tinfo_t return_type_tinfo() const { return ret_type_tinfo; }
+       ex conjugate() const;
+       ex real_part() const;
+       ex imag_part() const;
+       bool is_polynomial(const ex & var) const;
 protected:
        ex derivative(const symbol & s) const;
        bool is_equal_same_type(const basic & other) const;
@@ -81,6 +89,7 @@ public:
        void unassign();
        void set_name(const std::string & n) { name = n; }
        std::string get_name() const { return name; }
+       unsigned get_domain() const { return domain; }
 protected:
        void do_print(const print_context & c, unsigned level) const;
        void do_print_latex(const print_latex & c, unsigned level) const;
@@ -97,17 +106,36 @@ protected:
        unsigned serial;                 ///< unique serial number for comparison
        std::string name;                ///< printname of this symbol
        std::string TeX_name;            ///< LaTeX name of this symbol
+       unsigned domain;                 ///< domain of symbol, complex (default) or real
+       unsigned ret_type;               ///< value returned by return_type()
+       tinfo_t ret_type_tinfo;         ///< value returned by return_type_tinfo()
 private:
        static unsigned next_serial;
 };
 
 
+/** Specialization of symbol to real domain */
+class realsymbol : public symbol
+{
+       // constructors
+public:
+       realsymbol();
+       explicit realsymbol(const std::string & initname, unsigned domain = domain::real);
+       realsymbol(const std::string & initname, const std::string & texname, unsigned domain = domain::real);
+       realsymbol(const std::string & initname, unsigned rt, tinfo_t rtt, unsigned domain = domain::real);
+       realsymbol(const std::string & initname, const std::string & texname, unsigned rt, tinfo_t rtt, unsigned domain = domain::real);
+};
+
+
 // utility functions
 
-/** Specialization of is_exactly_a<symbol>(obj) for symbol objects. */
-template<> inline bool is_exactly_a<symbol>(const basic & obj)
+/** Specialization of is_exactly_a<realsymbol>(obj) for realsymbol objects. */
+template<> inline bool is_exactly_a<realsymbol>(const basic & obj)
 {
-       return obj.tinfo()==TINFO_symbol;
+       if (obj.tinfo() != &symbol::tinfo_static)
+               return false;
+       unsigned domain = static_cast<const symbol &>(obj).get_domain();
+       return domain==domain::real || domain==domain::positive;
 }
 
 // wrapper functions around member functions