X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?a=blobdiff_plain;ds=sidebyside;f=ginac%2Fsymmetry.h;h=5cd62c713ae295671dd158b115f77ecc7bc9daa7;hb=7d870583a6bf21a2ffb7b6f051b702064623892e;hp=d5a3ca8d21bd77e547693e432ccc4ef81b9e34f3;hpb=86ae5e2dfe39fb17f3d6c52a497a8309c9814111;p=ginac.git

diff --git a/ginac/symmetry.h b/ginac/symmetry.h
index d5a3ca8d..5cd62c71 100644
--- a/ginac/symmetry.h
+++ b/ginac/symmetry.h
@@ -3,7 +3,7 @@
  *  Interface to GiNaC's symmetry definitions. */
 
 /*
- *  GiNaC Copyright (C) 1999-2003 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2008 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
@@ -17,7 +17,7 @@
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 #ifndef __GINAC_SYMMETRY_H__
@@ -80,10 +80,13 @@ public:
 
 	/** Check whether this node actually represents any kind of symmetry. */
 	bool has_symmetry() const {return type != none || !children.empty(); }
+	/** Check whether this node involves a cyclic symmetry. */
+	bool has_cyclic() const;
 
 protected:
 	void do_print(const print_context & c, unsigned level) const;
 	void do_print_tree(const print_tree & c, unsigned level) const;
+	unsigned calchash() const;
 
 	// member variables
 private:
@@ -120,13 +123,23 @@ inline symmetry sy_cycl(const symmetry &c1, const symmetry &c2) { return symmetr
 inline symmetry sy_cycl(const symmetry &c1, const symmetry &c2, const symmetry &c3) { return symmetry(symmetry::cyclic, c1, c2).add(c3); }
 inline symmetry sy_cycl(const symmetry &c1, const symmetry &c2, const symmetry &c3, const symmetry &c4) { return symmetry(symmetry::cyclic, c1, c2).add(c3).add(c4); }
 
+// These return references to preallocated common symmetries (similar to
+// the numeric flyweights).
+const symmetry & not_symmetric();
+const symmetry & symmetric2();
+const symmetry & symmetric3();
+const symmetry & symmetric4();
+const symmetry & antisymmetric2();
+const symmetry & antisymmetric3();
+const symmetry & antisymmetric4();
+
 /** Canonicalize the order of elements of an expression vector, according to
  *  the symmetry properties defined in a symmetry tree.
  *
  *  @param v Start of expression vector
  *  @param symm Root node of symmetry tree
  *  @return the overall sign introduced by the reordering (+1, -1 or 0)
- *          or INT_MAX if nothing changed */
+ *          or numeric_limits<int>::max() if nothing changed */
 extern int canonicalize(exvector::iterator v, const symmetry &symm);
 
 /** Symmetrize expression over a set of objects (symbols, indices). */
@@ -158,14 +171,6 @@ inline ex symmetrize_cyclic(const ex & e, const exvector & v)
 	return symmetrize(e, v.begin(), v.end());
 }
 
-// utility functions
-
-/** Specialization of is_exactly_a<symmetry>(obj) for symmetry objects. */
-template<> inline bool is_exactly_a<symmetry>(const basic & obj)
-{
-	return obj.tinfo()==TINFO_symmetry;
-}
-
 } // namespace GiNaC
 
 #endif // ndef __GINAC_SYMMETRY_H__