+/** @file clifford.cpp
+ *
+ * Implementation of GiNaC's clifford algebra (Dirac gamma) objects. */
+
+/*
+ * GiNaC Copyright (C) 1999-2001 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
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * 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
+ */
+
+#include "clifford.h"
+#include "ex.h"
+#include "idx.h"
+#include "ncmul.h"
+#include "archive.h"
+#include "debugmsg.h"
+#include "utils.h"
+
+#include <stdexcept>
+
+namespace GiNaC {
+
+GINAC_IMPLEMENT_REGISTERED_CLASS(clifford, indexed)
+GINAC_IMPLEMENT_REGISTERED_CLASS(diracgamma, tensor)
+
+//////////
+// default constructor, destructor, copy constructor assignment operator and helpers
+//////////
+
+clifford::clifford()
+{
+ debugmsg("clifford default constructor", LOGLEVEL_CONSTRUCT);
+ tinfo_key = TINFO_clifford;
+}
+
+DEFAULT_COPY(clifford)
+DEFAULT_DESTROY(clifford)
+DEFAULT_CTORS(diracgamma)
+
+//////////
+// other constructors
+//////////
+
+/** Construct object with one Lorentz index. This constructor is for internal
+ * use only. Use the dirac_gamma() function instead.
+ * @see dirac_gamma */
+clifford::clifford(const ex & b, const ex & mu) : inherited(b, mu)
+{
+ debugmsg("clifford constructor from ex,ex", LOGLEVEL_CONSTRUCT);
+ GINAC_ASSERT(is_ex_of_type(mu, varidx));
+ tinfo_key = TINFO_clifford;
+}
+
+clifford::clifford(const exvector & v, bool discardable) : inherited(indexed::unknown, v, discardable)
+{
+ debugmsg("clifford constructor from exvector", LOGLEVEL_CONSTRUCT);
+ tinfo_key = TINFO_clifford;
+}
+
+clifford::clifford(exvector * vp) : inherited(indexed::unknown, vp)
+{
+ debugmsg("clifford constructor from exvector *", LOGLEVEL_CONSTRUCT);
+ tinfo_key = TINFO_clifford;
+}
+
+//////////
+// archiving
+//////////
+
+DEFAULT_ARCHIVING(clifford)
+DEFAULT_ARCHIVING(diracgamma)
+
+//////////
+// functions overriding virtual functions from bases classes
+//////////
+
+int clifford::compare_same_type(const basic & other) const
+{
+ return inherited::compare_same_type(other);
+}
+
+DEFAULT_COMPARE(diracgamma)
+DEFAULT_PRINT(diracgamma, "gamma")
+
+/** Perform automatic simplification on noncommutative product of clifford
+ * objects. */
+ex clifford::simplify_ncmul(const exvector & v) const
+{
+ //!! to be implemented
+ return nonsimplified_ncmul(v);
+}
+
+ex clifford::thisexprseq(const exvector & v) const
+{
+ return clifford(v);
+}
+
+ex clifford::thisexprseq(exvector * vp) const
+{
+ return clifford(vp);
+}
+
+//////////
+// global functions
+//////////
+
+ex dirac_gamma(const ex & mu)
+{
+ if (!is_ex_of_type(mu, varidx))
+ throw(std::invalid_argument("index of Dirac gamma must be of type varidx"));
+ return clifford(diracgamma(), mu);
+}
+
+} // namespace GiNaC
git://www.ginac.de / ginac.git / commitdiff