* Interface to GiNaC's symbolic objects. */
/*
- * GiNaC Copyright (C) 1999-2006 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
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;
friend class possymbol;
-// 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
- };
-
// member functions
// other constructors
// 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
// 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; }
// member variables
protected:
- ptr<assigned_ex_info> 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
return domain == domain::positive;
}
-// wrapper functions around member functions
-inline void unassign(symbol & symarg)
-{ symarg.unassign(); }
-
} // namespace GiNaC
#endif // ndef __GINAC_SYMBOL_H__