X-Git-Url: https://ginac.de/ginac.git//ginac.git?a=blobdiff_plain;f=ginac%2Frelational.h;h=ac6caecfd801425de214b380f8a7df0c8fff2a9c;hb=709e61093f43462b5816f859a32a31cc00758da8;hp=c988a631f2e59fad825badbeee29e62073f0d905;hpb=1bd972bf8e4eeeb8aec6081100876e81a7f18450;p=ginac.git

diff --git a/ginac/relational.h b/ginac/relational.h
index c988a631..ac6caecf 100644
--- a/ginac/relational.h
+++ b/ginac/relational.h
@@ -3,7 +3,7 @@
  *  Interface to relations between expressions. */
 
 /*
- *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2019 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
@@ -17,18 +17,17 @@
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
-#ifndef __GINAC_RELATIONAL_H__
-#define __GINAC_RELATIONAL_H__
+#ifndef GINAC_RELATIONAL_H
+#define GINAC_RELATIONAL_H
 
 #include "basic.h"
 #include "ex.h"
+#include "archive.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. */
@@ -51,48 +50,70 @@ public:
 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:
-	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;
-	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;
+	unsigned precedence() const override {return 20;}
+	bool info(unsigned inf) const override;
+	size_t nops() const override;
+	ex op(size_t i) const override;
+	ex map(map_function & f) const override;
+	ex subs(const exmap & m, unsigned options = 0) const override;
+
+	/** Save (a.k.a. serialize) object into archive. */
+	void archive(archive_node& n) const override;
+	/** Read (a.k.a. deserialize) object from archive. */
+	void read_archive(const archive_node& n, lst& syms) override;
 protected:
-	unsigned return_type(void) const;
-	unsigned return_type_tinfo(void) const;
+	ex eval_ncmul(const exvector & v) const override;
+	bool match_same_type(const basic & other) const override;
+	unsigned return_type() const override;
+	return_type_t return_type_tinfo() const override;
+	unsigned calchash() const override;
 
 	// new virtual functions which can be overridden by derived classes
+protected:
+	void do_print(const print_context & c, unsigned level) const;
+	void do_print_python_repr(const print_python_repr & c, unsigned level) const;
+
 public:
-	virtual ex lhs(void) const;
-	virtual ex rhs(void) const;
+	ex lhs() const { return lh; }
+	ex rhs() const { return rh; }
 
 	// non-virtual functions in this class
-public:
-	operator bool(void) const;
+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;
+
+public:
+	operator safe_bool() const;
+	safe_bool operator!() const;
+
 // member variables
 	
 protected:
 	ex lh;
 	ex rh;
 	operators o;
-	static unsigned precedence;
 };
+GINAC_DECLARE_UNARCHIVER(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__
+#endif // ndef GINAC_RELATIONAL_H