3 * Interface to GiNaC's Lorentz indices. */
6 * GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #ifndef __GINAC_LORENTZIDX_H__
24 #define __GINAC_LORENTZIDX_H__
30 #ifndef NO_NAMESPACE_GINAC
32 #endif // ndef NO_NAMESPACE_GINAC
35 /** Class of indices for Lorentz tensors, to tell them apart from other
36 * index families like color indices. The indices of this class also
37 * support the case of P-O-decomposed D-dimensional spacetime, where the
38 * parallel space is a Minkowski space with integral dimension P and the
39 * orthogonal space is a Euclidean space with (possibly complex) dimension
40 * D-P. The dimension D of spacetime is represented by the global symbol
41 * that is returned by the Dim() function. */
42 class lorentzidx : public idx
44 GINAC_DECLARE_REGISTERED_CLASS(lorentzidx, idx)
46 friend class simp_lor;
47 friend class scalar_products;
53 explicit lorentzidx(bool cov, bool oonly=false, unsigned dimp=0);
54 explicit lorentzidx(const std::string & n, bool cov=false,
55 bool oonly=false, unsigned dimp=0);
56 explicit lorentzidx(const char * n, bool cov=false,
57 bool oonly=false, unsigned dimp=0);
58 explicit lorentzidx(unsigned v, bool cov=false);
60 // functions overriding virtual functions from bases classes
62 basic * duplicate() const;
63 void printraw(std::ostream & os) const;
64 void printtree(std::ostream & os, unsigned indent) const;
65 void print(std::ostream & os, unsigned upper_precedence=0) const;
66 bool info(unsigned inf) const;
68 // new virtual functions which can be overridden by derived classes
71 // non-virtual functions in this class
73 /** Check whether index only lives in orthogonal space. */
74 bool is_orthogonal_only(void) const {return orthogonal_only;}
76 /** Return dimension of parallel space. */
77 unsigned get_dim_parallel_space(void) const {return dim_parallel_space;}
79 lorentzidx create_anonymous_representative(void) const;
83 bool orthogonal_only; /**< Symbolic index only lives in orthogonal space? */
84 unsigned dim_parallel_space; /**< Dimension of parallel space */
88 inline const lorentzidx &ex_to_lorentzidx(const ex &e)
90 return static_cast<const lorentzidx &>(*e.bp);
95 #ifndef NO_NAMESPACE_GINAC
97 #endif // ndef NO_NAMESPACE_GINAC
99 #endif // ndef __GINAC_LORENTZIDX_H__