X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fsymbol.h;h=29e7ad402b16eceb20cedd39684d800201f72a64;hp=6923300231b9e2eb51157c448d0e8f6e780ec53d;hb=32209e57010f19f080cc25e527347bcaa36053ec;hpb=3c75f4ed241bb89f09fd27b9ec6cd7bd240c2cda diff --git a/ginac/symbol.h b/ginac/symbol.h index 69233002..29e7ad40 100644 --- a/ginac/symbol.h +++ b/ginac/symbol.h @@ -3,7 +3,7 @@ * Interface to GiNaC's symbolic objects. */ /* - * GiNaC Copyright (C) 1999-2004 Johannes Gutenberg University Mainz, Germany + * GiNaC Copyright (C) 1999-2008 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 @@ -17,13 +17,14 @@ * * 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__ #define __GINAC_SYMBOL_H__ #include +#include #include "basic.h" #include "ex.h" #include "ptr.h" @@ -31,26 +32,13 @@ namespace GiNaC { /** Basic CAS symbol. It has a name because it must know how to output itself. - * It may be assigned an expression, but this feature is only intended for - * programs like 'ginsh' that want to associate symbols with expressions. - * If you want to replace symbols by expressions in your code, you should - * use ex::subs() or use objects of class ex instead of class symbol in the - * first place. */ + */ 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 : public refcounted { - public: - assigned_ex_info() throw(); ///< Default ctor - bool is_assigned; ///< True if there is an expression assigned - ex assigned_expression; ///< The actual expression - }; + friend class possymbol; // member functions @@ -58,22 +46,21 @@ class symbol : public basic public: 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, unsigned rt, unsigned rtt, unsigned domain = domain::complex); - symbol(const std::string & initname, const std::string & texname, unsigned rt, unsigned rtt, unsigned domain = domain::complex); // functions overriding virtual functions from base classes public: bool info(unsigned inf) const; - ex eval(int level = 0) const; + ex eval(int level = 0) const { return *this; } // for performance reasons ex evalf(int level = 0) const { return *this; } // overwrites basic::evalf() for performance reasons 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(exmap & repl) const; ex to_polynomial(exmap & repl) const; - unsigned return_type() const { return ret_type; } - unsigned 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; @@ -81,10 +68,9 @@ protected: // non-virtual functions in this class public: - void assign(const ex & value); - 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; @@ -97,13 +83,10 @@ private: // member variables protected: - ptr asexinfop; ///< assigned expression, only for private use by ginsh 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() - unsigned ret_type_tinfo; ///< value returned by return_type_tinfo() private: static unsigned next_serial; }; @@ -117,28 +100,39 @@ 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, unsigned rtt, unsigned domain = domain::real); - realsymbol(const std::string & initname, const std::string & texname, unsigned rt, unsigned rtt, unsigned domain = domain::real); }; -// utility functions - -/** Specialization of is_exactly_a(obj) for symbol objects. */ -template<> inline bool is_exactly_a(const basic & obj) +/** Specialization of symbol to real domain */ +class possymbol : public symbol { - return (obj.tinfo() == TINFO_symbol) && obj.info(info_flags::real); -} + // constructors +public: + possymbol(); + explicit possymbol(const std::string & initname, unsigned domain = domain::positive); + possymbol(const std::string & initname, const std::string & texname, unsigned domain = domain::positive); +}; + + +// utility functions /** Specialization of is_exactly_a(obj) for realsymbol objects. */ template<> inline bool is_exactly_a(const basic & obj) { - return (obj.tinfo() == TINFO_symbol) && obj.info(info_flags::real); + if (!is_a(obj)) + return false; + unsigned domain = static_cast(obj).get_domain(); + return domain==domain::real || domain==domain::positive; } -// wrapper functions around member functions -inline void unassign(symbol & symarg) -{ symarg.unassign(); } +/** Specialization of is_exactly_a(obj) for possymbol objects. */ +template<> inline bool is_exactly_a(const basic & obj) +{ + if (!is_a(obj)) + return false; + unsigned domain = static_cast(obj).get_domain(); + return domain == domain::positive; +} } // namespace GiNaC