* Implementation of GiNaC's symmetry definitions. */
/*
- * GiNaC Copyright (C) 1999-2008 Johannes Gutenberg University Mainz, Germany
+ * GiNaC Copyright (C) 1999-2009 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
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include <iostream>
-#include <stdexcept>
-#include <functional>
-#include <limits>
-
#include "symmetry.h"
#include "lst.h"
#include "numeric.h" // for factorial()
#include "operators.h"
#include "archive.h"
#include "utils.h"
+#include "hash_seed.h"
+
+#include <functional>
+#include <iostream>
+#include <limits>
+#include <stdexcept>
namespace GiNaC {
unsigned symmetry::calchash() const
{
- const void* this_tinfo = (const void*)typeid(*this).name();
- unsigned v = golden_ratio_hash((p_int)this_tinfo);
+ unsigned v = make_hash_seed(typeid(*this));
if (type == none) {
v = rotate_left(v);
- v ^= *(indices.begin());
+ if (!indices.empty())
+ v ^= *(indices.begin());
} else {
for (exvector::const_iterator i=children.begin(); i!=children.end(); ++i)
{