X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Frelational.cpp;h=86e2c2e8399bde1fbea5eb4db966e69aa2870f27;hp=05fe56e8b0103b8348ad6d7d418c8a17b11d0d7d;hb=882ddd98da749458e15d31f0eb261feb3ff8f9f1;hpb=b66548802c56b34d6b212a0196d622937841ca61

diff --git a/ginac/relational.cpp b/ginac/relational.cpp
index 05fe56e8..86e2c2e8 100644
--- a/ginac/relational.cpp
+++ b/ginac/relational.cpp
@@ -3,7 +3,7 @@
  *  Implementation of relations between expressions */
 
 /*
- *  GiNaC Copyright (C) 1999-2003 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
@@ -33,7 +33,7 @@ namespace GiNaC {
 
 GINAC_IMPLEMENT_REGISTERED_CLASS_OPT(relational, basic,
   print_func<print_context>(&relational::do_print).
-  print_func<print_tree>(&basic::do_print_tree).
+  print_func<print_tree>(&relational::do_print_tree).
   print_func<print_python_repr>(&relational::do_print_python_repr))
 
 //////////
@@ -164,7 +164,14 @@ ex relational::op(size_t i) const
 
 ex relational::map(map_function & f) const
 {
-	return (new relational(f(lh), f(rh), o))->setflag(status_flags::dynallocated);
+	const ex &mapped_lh = f(lh);
+	const ex &mapped_rh = f(rh);
+
+	if (!are_ex_trivially_equal(lh, mapped_lh)
+	 || !are_ex_trivially_equal(rh, mapped_rh))
+		return (new relational(mapped_lh, mapped_rh, o))->setflag(status_flags::dynallocated);
+	else
+		return *this;
 }
 
 ex relational::eval(int level) const