X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Frelational.h;h=fd3460a4734446e7d5e6ca7b28bcaab41e6637f2;hp=1ca6089336c71d3517df247c2b1a678c37172767;hb=c1e78ae6da1836cb5ca9f2f2967a97b1a37f99b2;hpb=68381b57513bb09d41cef9522afae60a40c2c3d7

diff --git a/ginac/relational.h b/ginac/relational.h
index 1ca60893..fd3460a4 100644
--- a/ginac/relational.h
+++ b/ginac/relational.h
@@ -3,7 +3,7 @@
  *  Interface to relations between expressions. */
 
 /*
- *  GiNaC Copyright (C) 1999-2000 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2004 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
@@ -26,90 +26,95 @@
 #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. */
 class relational : public basic
 {
-    GINAC_DECLARE_REGISTERED_CLASS(relational, 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
+	enum operators {
+		equal,
+		not_equal,
+		less,
+		less_or_equal,
+		greater,
+		greater_or_equal
+	};
+	
+	// other constructors
 public:
-    relational();
-    ~relational();
-    relational(const relational & other);
-    const relational & operator=(const relational & other);
+	relational(const ex & lhs, const ex & rhs, operators oper=equal);
+	
+	// functions overriding virtual functions from base classes
+public:
+	unsigned precedence() const {return 20;}
+	bool info(unsigned inf) const;
+	size_t nops() const;
+	ex op(size_t i) const;
+	ex map(map_function & f) const;
+	ex subs(const exmap & m, unsigned options = 0) const;
+	ex eval(int level=0) const;
+
 protected:
-    void copy(const relational & other);
-    void destroy(bool call_parent);
+	ex eval_ncmul(const exvector & v) const;
+	bool match_same_type(const basic & other) const;
+	unsigned return_type() const;
+	unsigned return_type_tinfo() const;
+	unsigned calchash() const;
 
-    // other constructors
-public:
-    relational(const ex & lhs, const ex & rhs, operators oper=equal);
-    
-    // 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 printcsrc(ostream & os, unsigned type, unsigned upper_precedence=0) const;
-    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 simplify_ncmul(const exvector & v) const;
+	// new virtual functions which can be overridden by derived classes
 protected:
-    int compare_same_type(const basic & other) const;
-    unsigned return_type(void) const;
-    unsigned return_type_tinfo(void) const;
+	void do_print(const print_context & c, unsigned level) const;
+	void do_print_python_repr(const print_python_repr & c, unsigned level) const;
 
-    // new virtual functions which can be overridden by derived classes
 public:
-    virtual ex lhs(void) const;
-    virtual ex rhs(void) const;
+	virtual ex lhs() const;
+	virtual ex rhs() const;
+
+	// non-virtual functions in this class
+private:
+	// For conversions to boolean, as would be used in an if conditional,
+	// implicit conversions from bool to int have a large number of
+	// undesirable side effects.  The following safe_bool type enables
+	// use of relational objects in conditionals without those side effects
+	struct safe_bool_helper {
+		void nonnull() {};
+	};
+
+	typedef void (safe_bool_helper::*safe_bool)();
+	
+	safe_bool make_safe_bool(bool) const;
 
-    // non-virtual functions in this class
 public:
-    operator bool(void) const;
-    
+	operator safe_bool() const;
+	safe_bool operator!() const;
+
 // member variables
-    
+	
 protected:
-    ex lh;
-    ex rh;
-    operators o;
-    static unsigned precedence;
+	ex lh;
+	ex rh;
+	operators o;
 };
 
-// global constants
+// utility functions
 
-extern const relational some_relational;
-extern const type_info & typeid_relational;
+/** 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;
+}
 
-// utility functions
-inline const relational &ex_to_relational(const ex &e)
+// inlined functions for efficiency
+inline relational::safe_bool relational::operator!() const
 {
-	return static_cast<const relational &>(*e.bp);
+	return make_safe_bool(!static_cast<bool>(*this));
 }
 
-#ifndef NO_NAMESPACE_GINAC
 } // namespace GiNaC
-#endif // ndef NO_NAMESPACE_GINAC
 
 #endif // ndef __GINAC_RELATIONAL_H__