* Interface to relations between expressions. */
/*
- * 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
#include "basic.h"
#include "ex.h"
-#ifndef NO_NAMESPACE_GINAC
namespace GiNaC {
-#endif // ndef NO_NAMESPACE_GINAC
/** This class holds a relation consisting of two expressions and a logical
* relation between them. */
// types
public:
- enum operators { equal,
- not_equal,
- less,
- less_or_equal,
- greater,
- greater_or_equal
+ 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(const relational & other);
- const relational & operator=(const relational & other);
-protected:
- void copy(const relational & other);
- void destroy(bool call_parent);
-
- // other constructors
+ // other ctors
public:
relational(const ex & lhs, const ex & rhs, operators oper=equal);
- // functions overriding virtual functions from bases classes
+ // 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 printcsrc(std::ostream & os, unsigned type, unsigned upper_precedence=0) 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 evalf(int level=0) const;
- ex normal(lst &sym_lst, lst &repl_lst, int level=0) const;
ex simplify_ncmul(const exvector & v) const;
+
protected:
- int compare_same_type(const basic & other) const;
+ bool match_same_type(const basic & other) const;
unsigned return_type(void) const;
unsigned return_type_tinfo(void) const;
ex lh;
ex rh;
operators o;
- static unsigned precedence;
};
-// global constants
-
-extern const relational some_relational;
-extern const type_info & typeid_relational;
-
// utility functions
+
+/** 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);
}
-#ifndef NO_NAMESPACE_GINAC
+/** 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 NO_NAMESPACE_GINAC
#endif // ndef __GINAC_RELATIONAL_H__