* Implementation of GiNaC's symbolic objects. */
/*
- * GiNaC Copyright (C) 1999-2008 Johannes Gutenberg University Mainz, Germany
+ * GiNaC Copyright (C) 1999-2010 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 <string>
-#include <stdexcept>
-#include <map>
-
#include "symbol.h"
#include "lst.h"
#include "archive.h"
#include "tostring.h"
#include "utils.h"
+#include "hash_seed.h"
#include "inifcns.h"
+#include <map>
+#include <stdexcept>
+#include <string>
+
namespace GiNaC {
GINAC_IMPLEMENT_REGISTERED_CLASS_OPT(symbol, basic,
for (lst::const_iterator it = sym_lst.begin(); it != sym_lst.end(); ++it) {
if (is_a<symbol>(*it) && (ex_to<symbol>(*it).name == tmp_name)) {
*this = ex_to<symbol>(*it);
+ // XXX: This method is responsible for reading realsymbol
+ // and possymbol objects too. But
+ // basic::operator=(const basic& other)
+ // resets status_flags::evaluated if other and *this are
+ // of different types. Usually this is a good idea, but
+ // doing this for symbols is wrong (for one, nothing is
+ // going to set status_flags::evaluated, evaluation will
+ // loop forever). Therefore we need to restore flags.
+ setflag(status_flags::evaluated | status_flags::expanded);
return;
}
}
unsigned symbol::calchash() const
{
- const void* this_tinfo = (const void*)typeid(*this).name();
- hashvalue = golden_ratio_hash((p_int)this_tinfo ^ serial);
+ unsigned seed = make_hash_seed(typeid(*this));
+ hashvalue = golden_ratio_hash(seed ^ serial);
setflag(status_flags::hash_calculated);
return hashvalue;
}