X-Git-Url: https://ginac.de/ginac.git//ginac.git?a=blobdiff_plain;f=ginac%2Frelational.cpp;h=51fd0f18ef9865b38b7ad91e908c74b81b24a757;hb=85ce9664ddba79c28a6945b1e5b4e2b71f77cb51;hp=db6b5cf2bb8e3c488a93b401d88b79ac178ca949;hpb=66c0f31c678e6c1938d637636b230ea376c157c1;p=ginac.git

diff --git a/ginac/relational.cpp b/ginac/relational.cpp
index db6b5cf2..51fd0f18 100644
--- a/ginac/relational.cpp
+++ b/ginac/relational.cpp
@@ -1,8 +1,9 @@
 /** @file relational.cpp
  *
- *  Implementation of relations between expressions
- *
- *  GiNaC Copyright (C) 1999 Johannes Gutenberg University Mainz, Germany
+ *  Implementation of relations between expressions */
+
+/*
+ *  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
@@ -23,226 +24,262 @@
 
 #include "relational.h"
 #include "numeric.h"
+#include "print.h"
+#include "archive.h"
+#include "utils.h"
+#include "debugmsg.h"
+
+namespace GiNaC {
+
+GINAC_IMPLEMENT_REGISTERED_CLASS(relational, basic)
 
 //////////
-// default constructor, destructor, copy constructor assignment operator and helpers
+// default ctor, dtor, copy ctor assignment operator and helpers
 //////////
 
-// public
-
 relational::relational() : basic(TINFO_relational)
 {
-    debugmsg("relational default constructor",LOGLEVEL_CONSTRUCT);
-}
-
-relational::~relational()
-{
-    debugmsg("relational destructor",LOGLEVEL_DESTRUCT);
-    destroy(0);
+	debugmsg("relational default ctor",LOGLEVEL_CONSTRUCT);
 }
 
-relational::relational(relational const & other)
+void relational::copy(const relational & other)
 {
-    debugmsg("relational copy constructor",LOGLEVEL_CONSTRUCT);
-    copy(other);
+	basic::copy(other);
+	lh=other.lh;
+	rh=other.rh;
+	o=other.o;
 }
 
-relational const & relational::operator=(relational const & other)
-{
-    debugmsg("relational operator=",LOGLEVEL_ASSIGNMENT);
-    if (this != &other) {
-        destroy(1);
-        copy(other);
-    }
-    return *this;
-}
+DEFAULT_DESTROY(relational)
 
-// protected
+//////////
+// other ctors
+//////////
 
-void relational::copy(relational const & other)
-{
-    basic::copy(other);
-    lh=other.lh;
-    rh=other.rh;
-    o=other.o;
-}
+// public
 
-void relational::destroy(bool call_parent)
+relational::relational(const ex & lhs, const ex & rhs, operators oper) : basic(TINFO_relational)
 {
-    if (call_parent) basic::destroy(call_parent);
+	debugmsg("relational ctor ex,ex,operator",LOGLEVEL_CONSTRUCT);
+	lh=lhs;
+	rh=rhs;
+	o=oper;
 }
 
 //////////
-// other constructors
+// archiving
 //////////
 
-// public
+relational::relational(const archive_node &n, const lst &sym_lst) : inherited(n, sym_lst)
+{
+	debugmsg("relational ctor from archive_node", LOGLEVEL_CONSTRUCT);
+	unsigned int opi;
+	if (!(n.find_unsigned("op", opi)))
+		throw (std::runtime_error("unknown relational operator in archive"));
+	o = (operators)opi;
+	n.find_ex("lh", lh, sym_lst);
+	n.find_ex("rh", rh, sym_lst);
+}
 
-relational::relational(ex const & lhs, ex const & rhs, operators oper) : basic(TINFO_relational)
+void relational::archive(archive_node &n) const
 {
-    debugmsg("relational constructor ex,ex,operator",LOGLEVEL_CONSTRUCT);
-    lh=lhs;
-    rh=rhs;
-    o=oper;
+	inherited::archive(n);
+	n.add_ex("lh", lh);
+	n.add_ex("rh", rh);
+	n.add_unsigned("op", o);
 }
 
+DEFAULT_UNARCHIVE(relational)
+
 //////////
 // functions overriding virtual functions from bases classes
 //////////
 
 // public
 
-basic * relational::duplicate() const
+void relational::print(const print_context & c, unsigned level) const
 {
-    debugmsg("relational duplicate",LOGLEVEL_DUPLICATE);
-    return new relational(*this);
+	debugmsg("relational print",LOGLEVEL_PRINT);
+
+	if (is_of_type(c, print_tree)) {
+
+		inherited::print(c, level);
+
+	} else {
+
+		if (precedence <= level)
+			c.s << "(";
+		lh.print(c, precedence);
+		switch (o) {
+		case equal:
+			c.s << "==";
+			break;
+		case not_equal:
+			c.s << "!=";
+			break;
+		case less:
+			c.s << "<";
+			break;
+		case less_or_equal:
+			c.s << "<=";
+			break;
+		case greater:
+			c.s << ">";
+			break;
+		case greater_or_equal:
+			c.s << ">=";
+			break;
+		default:
+			c.s << "(INVALID RELATIONAL OPERATOR)";
+		}
+		rh.print(c, precedence);
+		if (precedence <= level)
+			c.s << ")";
+	}
 }
 
 bool relational::info(unsigned inf) const
 {
-    switch (inf) {
-    case info_flags::relation:
-        return 1;
-    case info_flags::relation_equal:
-        return o==equal;
-    case info_flags::relation_not_equal:
-        return o==not_equal;
-    case info_flags::relation_less:
-        return o==less;
-    case info_flags::relation_less_or_equal:
-        return o==less_or_equal;
-    case info_flags::relation_greater:
-        return o==greater;
-    case info_flags::relation_greater_or_equal:
-        return o==greater_or_equal;
-    }
-    return 0;
+	switch (inf) {
+	case info_flags::relation:
+		return 1;
+	case info_flags::relation_equal:
+		return o==equal;
+	case info_flags::relation_not_equal:
+		return o==not_equal;
+	case info_flags::relation_less:
+		return o==less;
+	case info_flags::relation_less_or_equal:
+		return o==less_or_equal;
+	case info_flags::relation_greater:
+		return o==greater;
+	case info_flags::relation_greater_or_equal:
+		return o==greater_or_equal;
+	}
+	return 0;
 }
 
-int relational::nops() const
+unsigned relational::nops() const
 {
-    return 2;
+	return 2;
 }
 
-ex & relational::let_op(int const i)
+ex & relational::let_op(int i)
 {
-    ASSERT(i>=0);
-    ASSERT(i<2);
+	GINAC_ASSERT(i>=0);
+	GINAC_ASSERT(i<2);
 
-    return i==0 ? lh : rh;
+	return i==0 ? lh : rh;
 }
-    
+	
 ex relational::eval(int level) const
 {
-    if (level==1) {
-        return this->hold();
-    }
-    if (level == -max_recursion_level) {
-        throw(std::runtime_error("max recursion level reached"));
-    }
-    return (new relational(lh.eval(level-1),rh.eval(level-1),o))->
-            setflag(status_flags::dynallocated  |
-                    status_flags::evaluated );
+	if (level==1)
+		return this->hold();
+	
+	if (level == -max_recursion_level)
+		throw(std::runtime_error("max recursion level reached"));
+	
+	return (new relational(lh.eval(level-1),rh.eval(level-1),o))->setflag(status_flags::dynallocated | status_flags::evaluated);
 }
 
 ex relational::evalf(int level) const
 {
-    if (level==1) {
-        return *this;
-    }
-    if (level == -max_recursion_level) {
-        throw(std::runtime_error("max recursion level reached"));
-    }
-    return (new relational(lh.eval(level-1),rh.eval(level-1),o))->
-            setflag(status_flags::dynallocated);
+	if (level==1)
+		return *this;
+	
+	if (level==-max_recursion_level)
+		throw(std::runtime_error("max recursion level reached"));
+	
+	return (new relational(lh.eval(level-1),rh.eval(level-1),o))->setflag(status_flags::dynallocated);
 }
 
-ex relational::simplify_ncmul(exvector const & v) const
+ex relational::simplify_ncmul(const exvector & v) const
 {
-    return lh.simplify_ncmul(v);
+	return lh.simplify_ncmul(v);
 }
 
 // protected
 
-int relational::compare_same_type(basic const & other) const
+int relational::compare_same_type(const basic & other) const
 {
-    ASSERT(is_exactly_of_type(other, relational));
-    relational const & oth=static_cast<relational const &>(const_cast<basic &>(other));
-    
-    int cmpval;
-    
-    if (o == oth.o) {
-        cmpval=lh.compare(oth.lh);
-        if (cmpval==0) {
-            return rh.compare(oth.rh);
-        } else {
-            return cmpval;
-        }
-    }
-    if (o<oth.o) {
-        return -1;
-    } else {
-        return 1;
-    }
+	GINAC_ASSERT(is_exactly_of_type(other, relational));
+	const relational & oth=static_cast<const relational &>(const_cast<basic &>(other));
+	
+	int cmpval;
+	
+	if (o == oth.o) {
+		cmpval = lh.compare(oth.lh);
+		if (cmpval==0)
+			return rh.compare(oth.rh);
+		else
+			return cmpval;
+	}
+	if (o<oth.o)
+		return -1;
+	else
+		return 1;
 }
 
 unsigned relational::return_type(void) const
 {
-    ASSERT(lh.return_type()==rh.return_type());
-    return lh.return_type();
+	GINAC_ASSERT(lh.return_type()==rh.return_type());
+	return lh.return_type();
 }
    
 unsigned relational::return_type_tinfo(void) const
 {
-    ASSERT(lh.return_type_tinfo()==rh.return_type_tinfo());
-    return lh.return_type_tinfo();
+	GINAC_ASSERT(lh.return_type_tinfo()==rh.return_type_tinfo());
+	return lh.return_type_tinfo();
 }
 
 //////////
 // new virtual functions which can be overridden by derived classes
 //////////
 
-// none
+/** Left hand side of relational. */
+ex relational::lhs(void) const
+{
+	return lh;
+}
+
+/** Right hand side of relational. */
+ex relational::rhs(void) const
+{
+	return rh;    
+}
 
 //////////
 // non-virtual functions in this class
 //////////
 
-#include <iostream>
-
 relational::operator bool() const
 {
-    // please note that (a<b) == false does not imply (a>=b) == true
-    // a false result means the comparison is either false or undecidable
-    // (except for !=, where true means unequal or undecidable)
-    ex df=lh-rh;
-    if (!is_ex_exactly_of_type(df,numeric)) {
-        return o==not_equal ? true : false; // cannot decide on non-numerical results
-    }
-    int cmpval=ex_to_numeric(df).compare(numZERO());
-    switch (o) {
-    case equal:
-        return cmpval==0;
-        break;
-    case not_equal:
-        return cmpval!=0;
-        break;
-    case less:
-        return cmpval<0;
-        break;
-    case less_or_equal:
-        return cmpval<=0;
-        break;
-    case greater:
-        return cmpval>0;
-        break;
-    case greater_or_equal:
-        return cmpval>=0;
-        break;
-    default:
-        throw(std::logic_error("invalid relational operator"));
-    }
-    return 0;
+	// please note that (a<b) == false does not imply (a>=b) == true
+	// a false result means the comparison is either false or undecidable
+	// (except for !=, where true means unequal or undecidable)
+	ex df = lh-rh;
+	if (!is_ex_exactly_of_type(df,numeric))
+		// cannot decide on non-numerical results
+		return o==not_equal ? true : false;
+	
+	int cmpval = ex_to_numeric(df).compare(_num0());
+	switch (o) {
+	case equal:
+		return cmpval==0;
+	case not_equal:
+		return cmpval!=0;
+	case less:
+		return cmpval<0;
+	case less_or_equal:
+		return cmpval<=0;
+	case greater:
+		return cmpval>0;
+	case greater_or_equal:
+		return cmpval>=0;
+	default:
+		throw(std::logic_error("invalid relational operator"));
+	}
 }
 
 //////////
@@ -251,12 +288,6 @@ relational::operator bool() const
 
 // protected
 
-unsigned relational::precedence=20;
-
-//////////
-// global constants
-//////////
-
-const relational some_relational;
-type_info const & typeid_relational=typeid(some_relational);
+unsigned relational::precedence = 20;
 
+} // namespace GiNaC