* Interface to GiNaC's symbolic objects. */
/*
- * GiNaC Copyright (C) 1999-2007 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
#define __GINAC_SYMBOL_H__
#include <string>
+#include <typeinfo>
#include "basic.h"
#include "ex.h"
#include "ptr.h"
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
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, 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:
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; }
- tinfo_t return_type_tinfo() const { return ret_type_tinfo; }
ex conjugate() const;
ex real_part() const;
ex imag_part() const;
// 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
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;
};
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);
};
possymbol();
explicit possymbol(const std::string & initname, unsigned domain = domain::positive);
possymbol(const std::string & initname, const std::string & texname, unsigned domain = domain::positive);
- possymbol(const std::string & initname, unsigned rt, tinfo_t rtt, unsigned domain = domain::positive);
- possymbol(const std::string & initname, const std::string & texname, unsigned rt, tinfo_t rtt, unsigned domain = domain::positive);
};
/** Specialization of is_exactly_a<realsymbol>(obj) for realsymbol objects. */
template<> inline bool is_exactly_a<realsymbol>(const basic & obj)
{
- if (obj.tinfo() != &symbol::tinfo_static)
+ if (!is_a<symbol>(obj))
return false;
unsigned domain = static_cast<const symbol &>(obj).get_domain();
return domain==domain::real || domain==domain::positive;
/** Specialization of is_exactly_a<possymbol>(obj) for possymbol objects. */
template<> inline bool is_exactly_a<possymbol>(const basic & obj)
{
- if (obj.tinfo() != &symbol::tinfo_static)
+ if (!is_a<symbol>(obj))
return false;
unsigned domain = static_cast<const symbol &>(obj).get_domain();
return domain == domain::positive;
}
-// wrapper functions around member functions
-inline void unassign(symbol & symarg)
-{ symarg.unassign(); }
-
} // namespace GiNaC
#endif // ndef __GINAC_SYMBOL_H__