X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fsymbol.h;h=55f2826ccc8073c2749b9cee6db1e6a18770c20a;hp=927e0b534d66a6761ed13cb9463789595430a9b6;hb=0f7b8280ad89fa88a0cbaab7785a4b7cb06e6a63;hpb=383d5eb3b0f0506810d9105a268f939125bfc347

diff --git a/ginac/symbol.h b/ginac/symbol.h
index 927e0b53..55f2826c 100644
--- a/ginac/symbol.h
+++ b/ginac/symbol.h
@@ -3,7 +3,7 @@
  *  Interface to GiNaC's symbolic objects. */
 
 /*
- *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2003 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
@@ -26,10 +26,9 @@
 #include <string>
 #include "basic.h"
 #include "ex.h"
+#include "ptr.h"
 
-#ifndef NO_NAMESPACE_GINAC
 namespace GiNaC {
-#endif // ndef NO_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
@@ -42,99 +41,81 @@ class symbol : public basic
 	GINAC_DECLARE_REGISTERED_CLASS(symbol, basic)
 
 // types
-
-	/** Symbols as keys to expressions. */
+	
+	/** Symbols as keys to expressions - only for ginsh. */
 	class assigned_ex_info {
+		friend class ptr<assigned_ex_info>;
 	public:
-		assigned_ex_info();     //!< Default ctor
-		bool is_assigned;       //!< True if there is an expression assigned
-		ex assigned_expression; //!< The actual expression
-		unsigned refcount;      //!< Yet another refcounter. PLEASE EXPLAIN!
+		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>
 	};
-	
-// member functions
-
-	// default constructor, destructor, copy constructor assignment operator and helpers
-public:
-	symbol();
-	~symbol();
-	symbol(const symbol & other);
-protected:
-	void copy(const symbol & other); 
-	void destroy(bool call_parent);
 
+// member functions
+	
 	// other constructors
 public:
 	explicit symbol(const std::string & initname);
-
+	explicit symbol(const std::string & initname, const std::string & texname);
+	
 	// functions overriding virtual functions from base classes
 public:
-	basic * duplicate() const;
-	void print(std::ostream & os, unsigned upper_precedence = 0) const;
-	void printraw(std::ostream & os) const;
-	void printtree(std::ostream & os, unsigned indent) const;
-	void printcsrc(std::ostream & os, unsigned type, unsigned upper_precedence = 0) const;
+	void print(const print_context & c, unsigned level = 0) const;
 	bool info(unsigned inf) const;
-	ex expand(unsigned options = 0) const;
-	bool has(const ex & other) const;
-	int degree(const symbol & s) const;
-	int ldegree(const symbol & s) const;
-	ex coeff(const symbol & s, int n = 1) const;
 	ex eval(int level = 0) const;
+	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 normal(lst &sym_lst, lst &repl_lst, int level = 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 subs(const lst & ls, const lst & lr) const;
+	ex to_polynomial(lst &repl_lst) const;
 protected:
 	ex derivative(const symbol & s) const;
-	int compare_same_type(const basic & other) const;
 	bool is_equal_same_type(const basic & other) const;
-	unsigned return_type(void) const;
-	unsigned return_type_tinfo(void) const;
-	unsigned calchash(void) const;
+	unsigned calchash() const;
 	
 	// non-virtual functions in this class
 public:
 	void assign(const ex & value);
-	void unassign(void);
-	void setname(const std::string & n) { name = n; }
-	std::string getname(void) const { return name; }
+	void unassign();
+	void set_name(const std::string & n) { name = n; }
+	std::string get_name() const { return name; }
 private:
-	std::string & autoname_prefix(void);
+	std::string & autoname_prefix();
+	std::string default_TeX_name() const;
 
 // member variables
 
 protected:
-	assigned_ex_info * asexinfop;
-	unsigned serial;  //!< unique serial number for comparision
-	std::string name;
+	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
 private:
 	static unsigned next_serial;
 };
 
-// global constants
-
-extern const symbol some_symbol;
-extern const std::type_info & typeid_symbol;
 
 // utility functions
-inline const symbol &ex_to_symbol(const ex &e)
+
+/** Specialization of is_exactly_a<symbol>(obj) for symbol objects. */
+template<> inline bool is_exactly_a<symbol>(const basic & obj)
 {
-	return static_cast<const symbol &>(*e.bp);
+	return obj.tinfo()==TINFO_symbol;
 }
 
 // wrapper functions around member functions
 inline void unassign(symbol & symarg)
 { symarg.unassign(); }
 
-inline int degree(const symbol & a, const symbol & s)
+inline int degree(const symbol & a, const ex & s)
 { return a.degree(s); }
 
-inline int ldegree(const symbol & a, const symbol & s)
+inline int ldegree(const symbol & a, const ex & s)
 { return a.ldegree(s); }
 
-#ifndef NO_NAMESPACE_GINAC
 } // namespace GiNaC
-#endif // ndef NO_NAMESPACE_GINAC
 
 #endif // ndef __GINAC_SYMBOL_H__