* Interface to GiNaC's constant types and some special constants. */
/*
- * GiNaC Copyright (C) 1999-2000 Johannes Gutenberg University Mainz, Germany
+ * GiNaC Copyright (C) 1999-2001 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_CONSTANT_H__
#include <string>
-#include <ginac/basic.h>
+#include "basic.h"
+#include "ex.h"
-#ifndef NO_GINAC_NAMESPACE
namespace GiNaC {
-#endif // ndef NO_GINAC_NAMESPACE
typedef ex (*evalffunctype)(void);
-
+
/** This class holds constants, symbols with specific numerical value. Each
* object of this class must either provide their own function to evaluate it
* to class numeric or provide the constant as a numeric (if it's an exact
* number). */
class constant : public basic
{
- GINAC_DECLARE_REGISTERED_CLASS(constant, basic)
-
+ GINAC_DECLARE_REGISTERED_CLASS(constant, basic)
+
// member functions
-
- // default constructor, destructor, copy constructor assignment operator and helpers
+
+ // other ctors
public:
- constant();
- ~constant();
- constant(const constant & other);
- // const constant & operator=(const constant & other); /* it's pervert! */
-protected:
- void copy(const constant & other);
- void destroy(bool call_parent);
-
- // other constructors
+ constant(const std::string & initname, evalffunctype efun = 0);
+ constant(const std::string & initname, const numeric & initnumber);
+
+ // functions overriding virtual functions from bases classes
public:
- constant(const string & initname, evalffunctype efun=0);
- constant(const string & initname, const numeric & initnumber);
-
- // functions overriding virtual functions from bases classes
-public:
- basic * duplicate() const;
- void print(ostream & os, unsigned upper_precedence=0) const;
- void printraw(ostream & os) const;
- void printtree(ostream & os, unsigned indent) const;
- void printcsrc(ostream & os, unsigned type, unsigned upper_precedence=0) const;
- ex evalf(int level=0) const;
- ex diff(const symbol & s) 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;
+ ex evalf(int level = 0) const;
protected:
- int compare_same_type(const basic & other) const;
- bool is_equal_same_type(const basic & other) const;
-
- // new virtual functions which can be overridden by derived classes
- // none
-
- // non-virtual functions in this class
- // none
-
+ ex derivative(const symbol & s) const;
+ bool is_equal_same_type(const basic & other) const;
+ unsigned calchash(void) const;
+
+ // new virtual functions which can be overridden by derived classes
+ // none
+
+ // non-virtual functions in this class
+ // none
+
// member variables
-
+
private:
- string name;
- evalffunctype ef;
- numeric * number;
- // bool fct_assigned;
- unsigned serial; //!< unique serial number for comparision
- static unsigned next_serial;
+ std::string name; ///< printname of this constant
+ evalffunctype ef;
+ numeric *number; ///< numerical value this constant evalf()s to
+ unsigned serial; ///< unique serial number for comparison
+ static unsigned next_serial;
};
-// global constants
-
-extern const constant some_constant;
-extern const type_info & typeid_constant;
-
-// extern const numeric I;
extern const constant Pi;
extern const constant Catalan;
-extern const constant EulerGamma;
+extern const constant Euler;
+
+// utility functions
+inline const constant &ex_to_constant(const ex &e)
+{
+ return static_cast<const constant &>(*e.bp);
+}
-#ifndef NO_GINAC_NAMESPACE
} // namespace GiNaC
-#endif // ndef NO_GINAC_NAMESPACE
#endif // ndef __GINAC_CONSTANT_H__