* Implementation of GiNaC's symmetry definitions. */
/*
- * GiNaC Copyright (C) 1999-2006 Johannes Gutenberg University Mainz, Germany
+ * GiNaC Copyright (C) 1999-2011 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 "symmetry.h"
#include "lst.h"
+#include "add.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 {
// default constructor
//////////
-symmetry::symmetry() : inherited(&symmetry::tinfo_static), type(none)
+symmetry::symmetry() : type(none)
{
setflag(status_flags::evaluated | status_flags::expanded);
}
// other constructors
//////////
-symmetry::symmetry(unsigned i) : inherited(&symmetry::tinfo_static), type(none)
+symmetry::symmetry(unsigned i) : type(none)
{
indices.insert(i);
setflag(status_flags::evaluated | status_flags::expanded);
}
-symmetry::symmetry(symmetry_type t, const symmetry &c1, const symmetry &c2) : inherited(&symmetry::tinfo_static), type(t)
+symmetry::symmetry(symmetry_type t, const symmetry &c1, const symmetry &c2) : type(t)
{
add(c1); add(c2);
setflag(status_flags::evaluated | status_flags::expanded);
//////////
/** Construct object from archive_node. */
-symmetry::symmetry(const archive_node &n, lst &sym_lst) : inherited(n, sym_lst)
+void symmetry::read_archive(const archive_node &n, lst &sym_lst)
{
+ inherited::read_archive(n, sym_lst);
unsigned t;
if (!(n.find_unsigned("type", t)))
throw (std::runtime_error("unknown symmetry type in archive"));
}
}
}
+GINAC_BIND_UNARCHIVER(symmetry);
/** Archive the object. */
void symmetry::archive(archive_node &n) const
}
}
-DEFAULT_UNARCHIVE(symmetry)
-
//////////
// functions overriding virtual functions from base classes
//////////
return 1;
if (this_size < that_size)
return -1;
- typedef std::set<unsigned>::iterator set_it;
+ typedef std::set<unsigned>::const_iterator set_it;
set_it end = indices.end();
for (set_it i=indices.begin(),j=othersymm.indices.begin(); i!=end; ++i,++j) {
if(*i < *j)
unsigned symmetry::calchash() const
{
- unsigned v = golden_ratio_hash((p_int)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)
{
// 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)
+ return true;
+
+ for (exvector::const_iterator i=children.begin(); i!=children.end(); ++i)
+ if (ex_to<symmetry>(*i).has_cyclic())
+ return true;
+
+ return false;
+}
+
symmetry &symmetry::add(const symmetry &c)
{
// All children must have the same number of indices
{
// Less than two elements? Then do nothing
if (symm.indices.size() < 2)
- return INT_MAX;
+ return std::numeric_limits<int>::max();
// Canonicalize children first
bool something_changed = false;
int child_sign = canonicalize(v, ex_to<symmetry>(*first));
if (child_sign == 0)
return 0;
- if (child_sign != INT_MAX) {
+ if (child_sign != std::numeric_limits<int>::max()) {
something_changed = true;
sign *= child_sign;
}
default:
break;
}
- return something_changed ? sign : INT_MAX;
+ return something_changed ? sign : std::numeric_limits<int>::max();
}
// 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++)
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;