X-Git-Url: https://ginac.de/ginac.git//ginac.git?a=blobdiff_plain;f=ginac%2Fadd.cpp;h=2fa73dc27d168068294b07bc19979f98454dcbda;hb=11fcbe7ea462936b79807a1f12273e5685f3f744;hp=88024bdf29a6028b0a86ca6dab400bb3ead7d86f;hpb=3ac17e18ada69428fe170c10abcc5f33a30f0676;p=ginac.git

diff --git a/ginac/add.cpp b/ginac/add.cpp
index 88024bdf..2fa73dc2 100644
--- a/ginac/add.cpp
+++ b/ginac/add.cpp
@@ -3,7 +3,7 @@
  *  Implementation of GiNaC's sums of expressions. */
 
 /*
- *  GiNaC Copyright (C) 1999-2006 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2008 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
@@ -22,6 +22,8 @@
 
 #include <iostream>
 #include <stdexcept>
+#include <limits>
+#include <string>
 
 #include "add.h"
 #include "mul.h"
@@ -171,37 +173,32 @@ void add::do_print_csrc(const print_csrc & c, unsigned level) const
 	if (precedence() <= level)
 		c.s << "(";
 	
-	// Print arguments, separated by "+"
+	// Print arguments, separated by "+" or "-"
 	epvector::const_iterator it = seq.begin(), itend = seq.end();
+	char separator = ' ';
 	while (it != itend) {
 		
-		// If the coefficient is -1, it is replaced by a single minus sign
-		if (it->coeff.is_equal(_ex1)) {
+		// If the coefficient is negative, separator is "-"
+		if (it->coeff.is_equal(_ex_1) || 
+			ex_to<numeric>(it->coeff).numer().is_equal(*_num_1_p))
+			separator = '-';
+		c.s << separator;
+		if (it->coeff.is_equal(_ex1) || it->coeff.is_equal(_ex_1)) {
 			it->rest.print(c, precedence());
-		} else if (it->coeff.is_equal(_ex_1)) {
-			c.s << "-";
+		} else if (ex_to<numeric>(it->coeff).numer().is_equal(*_num1_p) ||
+				 ex_to<numeric>(it->coeff).numer().is_equal(*_num_1_p))
+		{
 			it->rest.print(c, precedence());
-		} else if (ex_to<numeric>(it->coeff).numer().is_equal(*_num1_p)) {
-			it->rest.print(c, precedence());
-			c.s << "/";
-			ex_to<numeric>(it->coeff).denom().print(c, precedence());
-		} else if (ex_to<numeric>(it->coeff).numer().is_equal(*_num_1_p)) {
-			c.s << "-";
-			it->rest.print(c, precedence());
-			c.s << "/";
+			c.s << '/';
 			ex_to<numeric>(it->coeff).denom().print(c, precedence());
 		} else {
 			it->coeff.print(c, precedence());
-			c.s << "*";
+			c.s << '*';
 			it->rest.print(c, precedence());
 		}
 		
-		// Separator is "+", except if the following expression would have a leading minus sign or the sign is sitting in parenthesis (as in a ctor)
 		++it;
-		if (it != itend
-		 && (is_a<print_csrc_cl_N>(c) || !it->coeff.info(info_flags::real)  // sign inside ctor arguments
-		  || !(it->coeff.info(info_flags::negative) || (it->coeff.is_equal(*_num1_p) && is_exactly_a<numeric>(it->rest) && it->rest.info(info_flags::negative)))))
-			c.s << "+";
+		separator = '+';
 	}
 	
 	if (!overall_coeff.is_zero()) {
@@ -258,7 +255,7 @@ bool add::info(unsigned inf) const
 
 int add::degree(const ex & s) const
 {
-	int deg = INT_MIN;
+	int deg = std::numeric_limits<int>::min();
 	if (!overall_coeff.is_zero())
 		deg = 0;
 	
@@ -275,7 +272,7 @@ int add::degree(const ex & s) const
 
 int add::ldegree(const ex & s) const
 {
-	int deg = INT_MAX;
+	int deg = std::numeric_limits<int>::max();
 	if (!overall_coeff.is_zero())
 		deg = 0;
 	
@@ -424,6 +421,42 @@ ex add::conjugate() const
 	return *this;
 }
 
+ex add::real_part() const
+{
+	epvector v;
+	v.reserve(seq.size());
+	for (epvector::const_iterator i=seq.begin(); i!=seq.end(); ++i)
+		if ((i->coeff).info(info_flags::real)) {
+			ex rp = (i->rest).real_part();
+			if (!rp.is_zero())
+				v.push_back(expair(rp, i->coeff));
+		} else {
+			ex rp=recombine_pair_to_ex(*i).real_part();
+			if (!rp.is_zero())
+				v.push_back(split_ex_to_pair(rp));
+		}
+	return (new add(v, overall_coeff.real_part()))
+		-> setflag(status_flags::dynallocated);
+}
+
+ex add::imag_part() const
+{
+	epvector v;
+	v.reserve(seq.size());
+	for (epvector::const_iterator i=seq.begin(); i!=seq.end(); ++i)
+		if ((i->coeff).info(info_flags::real)) {
+			ex ip = (i->rest).imag_part();
+			if (!ip.is_zero())
+				v.push_back(expair(ip, i->coeff));
+		} else {
+			ex ip=recombine_pair_to_ex(*i).imag_part();
+			if (!ip.is_zero())
+				v.push_back(split_ex_to_pair(ip));
+		}
+	return (new add(v, overall_coeff.imag_part()))
+		-> setflag(status_flags::dynallocated);
+}
+
 ex add::eval_ncmul(const exvector & v) const
 {
 	if (seq.empty())
@@ -465,7 +498,7 @@ unsigned add::return_type() const
 		return seq.begin()->rest.return_type();
 }
 
-const basic* add::return_type_tinfo() const
+tinfo_t add::return_type_tinfo() const
 {
 	if (seq.empty())
 		return this;
@@ -473,12 +506,14 @@ const basic* add::return_type_tinfo() const
 		return seq.begin()->rest.return_type_tinfo();
 }
 
-ex add::thisexpairseq(const epvector & v, const ex & oc) const
+// Note: do_index_renaming is ignored because it makes no sense for an add.
+ex add::thisexpairseq(const epvector & v, const ex & oc, bool do_index_renaming) const
 {
 	return (new add(v,oc))->setflag(status_flags::dynallocated);
 }
 
-ex add::thisexpairseq(std::auto_ptr<epvector> vp, const ex & oc) const
+// Note: do_index_renaming is ignored because it makes no sense for an add.
+ex add::thisexpairseq(std::auto_ptr<epvector> vp, const ex & oc, bool do_index_renaming) const
 {
 	return (new add(vp,oc))->setflag(status_flags::dynallocated);
 }