* Interface to relations between expressions. */
/*
- * GiNaC Copyright (C) 1999 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
#ifndef __GINAC_RELATIONAL_H__
#define __GINAC_RELATIONAL_H__
-#include <ginac/basic.h>
-#include <ginac/ex.h>
+#include "basic.h"
+#include "ex.h"
+
+namespace GiNaC {
/** This class holds a relation consisting of two expressions and a logical
* relation between them. */
class relational : public basic
{
+ GINAC_DECLARE_REGISTERED_CLASS(relational, basic)
// types
public:
- enum operators { equal,
- not_equal,
- less,
- less_or_equal,
- greater,
- greater_or_equal
- };
-
-// member functions
-
- // default constructor, destructor, copy constructor assignment operator and helpers
-public:
- relational();
- ~relational();
- relational(relational const & other);
- relational const & operator=(relational const & other);
-protected:
- void copy(relational const & other);
- void destroy(bool call_parent);
-
- // other constructors
+ enum operators {
+ equal,
+ not_equal,
+ less,
+ less_or_equal,
+ greater,
+ greater_or_equal
+ };
+
+ // other ctors
public:
- relational(ex const & lhs, ex const & rhs, operators oper=equal);
-
- // functions overriding virtual functions from bases classes
+ relational(const ex & lhs, const ex & rhs, operators oper=equal);
+
+ // functions overriding virtual functions from base classes
public:
- basic * duplicate() const;
- void printraw(ostream & os) const;
- void print(ostream & os, unsigned upper_precedence=0) const;
- void printcsrc(ostream & os, unsigned type, unsigned upper_precedence=0) const;
- bool info(unsigned inf) const;
- int nops() const;
- ex & let_op(int const i);
- ex eval(int level=0) const;
- ex evalf(int level=0) const;
- ex simplify_ncmul(exvector const & v) const;
+ void print(const print_context & c, unsigned level = 0) const;
+ unsigned precedence(void) const {return 20;}
+ bool info(unsigned inf) const;
+ unsigned nops() const;
+ ex & let_op(int i);
+ ex eval(int level=0) const;
+ ex simplify_ncmul(const exvector & v) const;
+
protected:
- int compare_same_type(basic const & other) const;
- unsigned return_type(void) const;
- unsigned return_type_tinfo(void) const;
+ bool match_same_type(const basic & other) const;
+ unsigned return_type(void) const;
+ unsigned return_type_tinfo(void) const;
- // new virtual functions which can be overridden by derived classes
- // none
+ // new virtual functions which can be overridden by derived classes
+public:
+ virtual ex lhs(void) const;
+ virtual ex rhs(void) const;
- // non-virtual functions in this class
+ // non-virtual functions in this class
public:
- operator bool(void) const;
-
+ operator bool(void) const;
+
// member variables
-
+
protected:
- ex lh;
- ex rh;
- operators o;
- static unsigned precedence;
+ ex lh;
+ ex rh;
+ operators o;
};
-// global constants
-
-extern const relational some_relational;
-extern type_info const & typeid_relational;
+// utility functions
-#define ex_to_relational(X) static_cast<relational const &>(*(X).bp)
+/** Return the relational object handled by an ex. Deprecated: use ex_to<relational>().
+ * This is unsafe: you need to check the type first. */
+inline const relational &ex_to_relational(const ex &e)
+{
+ return static_cast<const relational &>(*e.bp);
+}
-#endif // ndef __GINAC_RELATIONAL_H__
+/** Specialization of is_exactly_a<relational>(obj) for relational objects. */
+template<> inline bool is_exactly_a<relational>(const basic & obj)
+{
+ return obj.tinfo()==TINFO_relational;
+}
+} // namespace GiNaC
+#endif // ndef __GINAC_RELATIONAL_H__