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/** @file clifford.h
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*
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* Interface to GiNaC's clifford objects. */
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/*
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* GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __GINAC_CLIFFORD_H__
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#define __GINAC_CLIFFORD_H__
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#include <string>
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#include "lortensor.h"
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#ifndef NO_NAMESPACE_GINAC
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namespace GiNaC {
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#endif // ndef NO_NAMESPACE_GINAC
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/** This class holds an object representing an element of the Clifford
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* algebra (the Dirac gamma matrices). These objects only carry Lorentz
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* indices. Spinor indices are always hidden in our implementation. */
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class clifford : public lortensor
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{
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GINAC_DECLARE_REGISTERED_CLASS(clifford, lortensor)
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// friends
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friend clifford clifford_gamma(const ex & mu);
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// member functions
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// default constructor, destructor, copy constructor assignment operator and helpers
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public:
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clifford();
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~clifford();
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clifford(const clifford & other);
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const clifford & operator=(const clifford & other);
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protected:
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void copy(const clifford & other);
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void destroy(bool call_parent);
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// other constructors
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public:
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clifford(const std::string & n, const ex & mu);
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clifford(const std::string & n, const exvector & iv);
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clifford(const std::string & n, exvector * ivp);
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// functions overriding virtual functions from base classes
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public:
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basic * duplicate() const;
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void printraw(std::ostream & os) const;
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void printtree(std::ostream & os, unsigned indent) const;
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void print(std::ostream & os, unsigned upper_precedence=0) const;
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bool info(unsigned inf) const;
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// ex eval(int level=0) const;
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protected:
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int compare_same_type(const basic & other) const;
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bool is_equal_same_type(const basic & other) const;
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ex simplify_ncmul(const exvector & v) const;
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ex thisexprseq(const exvector & v) const;
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ex thisexprseq(exvector * vp) const;
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// new virtual functions which can be overridden by derived classes
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// none
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// non-virtual functions in this class
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// none
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// member variables
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// none
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};
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// global functions
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inline const clifford &ex_to_clifford(const ex &e)
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{
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return static_cast<const clifford &>(*e.bp);
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}
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clifford clifford_gamma(const ex & mu);
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#ifndef NO_NAMESPACE_GINAC
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} // namespace GiNaC
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#endif // ndef NO_NAMESPACE_GINAC
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#endif // ndef __GINAC_CLIFFORD_H__
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