X-Git-Url: https://ginac.de/ginac.git//ginac.git?a=blobdiff_plain;ds=sidebyside;f=ginac%2Fsymmetry.cpp;h=a44cfcc5df87d0a8b02d9518d965972883c66620;hb=2c886a86f1d020e927d64ab2c79b20437a6bd561;hp=7d1ff9785298484b97d0fc0dacbaee9b71e8cf7d;hpb=286b0d93528e35957a50c51343e0b4a9bc623bce;p=ginac.git

diff --git a/ginac/symmetry.cpp b/ginac/symmetry.cpp
index 7d1ff978..a44cfcc5 100644
--- a/ginac/symmetry.cpp
+++ b/ginac/symmetry.cpp
@@ -22,6 +22,7 @@
 
 #include "symmetry.h"
 #include "lst.h"
+#include "add.h"
 #include "numeric.h" // for factorial()
 #include "operators.h"
 #include "archive.h"
@@ -269,6 +270,18 @@ void symmetry::do_print_tree(const print_tree & c, unsigned level) const
 // non-virtual functions in this class
 //////////
 
+bool symmetry::has_nonsymmetric() const
+{
+	if (type == antisymmetric || type == cyclic)
+		return true;
+
+	for (exvector::const_iterator i=children.begin(); i!=children.end(); ++i)
+		if (ex_to<symmetry>(*i).has_nonsymmetric())
+			return true;
+
+	return false;
+}
+
 bool symmetry::has_cyclic() const
 {
 	if (type == cyclic)
@@ -495,7 +508,8 @@ static ex symm(const ex & e, exvector::const_iterator first, exvector::const_ite
 
 	// Loop over all permutations (the first permutation, which is the
 	// identity, is unrolled)
-	ex sum = e;
+	exvector sum_v;
+	sum_v.push_back(e);
 	while (std::next_permutation(iv, iv + num)) {
 		lst new_lst;
 		for (unsigned i=0; i<num; i++)
@@ -505,8 +519,9 @@ static ex symm(const ex & e, exvector::const_iterator first, exvector::const_ite
 			memcpy(iv2, iv, num * sizeof(unsigned));
 			term *= permutation_sign(iv2, iv2 + num);
 		}
-		sum += term;
+		sum_v.push_back(term);
 	}
+	ex sum = (new add(sum_v))->setflag(status_flags::dynallocated);
 
 	delete[] iv;
 	delete[] iv2;