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
34 /** Class of indices for Lorentz tensors, to tell them apart from other index
35 * families like color indices. The indices of this class also support the
36 * case of P-O-decomposed D-dimensional spacetime, where the parallel space
37 * is a Minkowski-like space with integral dimension P and the orthogonal
38 * space is a Euclidean space with (possibly complex) dimension D-P. */
39 class lorentzidx : public idx
41 GINAC_DECLARE_REGISTERED_CLASS(lorentzidx, idx)
43 friend class simp_lor;
44 friend class scalar_products;
48 // default constructor, destructor, copy constructor assignment operator and helpers
52 lorentzidx (const lorentzidx & other);
53 const lorentzidx & operator=(const lorentzidx & other);
55 void copy(const lorentzidx & other);
56 void destroy(bool call_parent);
60 explicit lorentzidx(bool cov, bool oonly=false, unsigned dimp=0);
61 explicit lorentzidx(const std::string & n, bool cov=false,
62 bool oonly=false, unsigned dimp=0);
63 explicit lorentzidx(const char * n, bool cov=false,
64 bool oonly=false, unsigned dimp=0);
65 explicit lorentzidx(unsigned v, bool cov=false);
67 // functions overriding virtual functions from bases classes
69 basic * duplicate() const;
70 void printraw(std::ostream & os) const;
71 void printtree(std::ostream & os, unsigned indent) const;
72 void print(std::ostream & os, unsigned upper_precedence=0) const;
73 bool info(unsigned inf) const;
75 // new virtual functions which can be overridden by derived classes
78 // non-virtual functions in this class
80 /** Check whether index only lives in orthogonal space. */
81 bool is_orthogonal_only(void) const {return orthogonal_only;}
83 /** Return dimension of parallel space. */
84 unsigned get_dim_parallel_space(void) const {return dim_parallel_space;}
86 lorentzidx create_anonymous_representative(void) const;
90 bool orthogonal_only; /**< Symbolic index only lives in orthogonal space? */
91 unsigned dim_parallel_space; /**< Dimension of parallel space */
96 extern const lorentzidx some_lorentzidx;
97 extern const std::type_info & typeid_lorentzidx;
100 inline const lorentzidx &ex_to_lorentzidx(const ex &e)
102 return static_cast<const lorentzidx &>(*e.bp);
105 #ifndef NO_NAMESPACE_GINAC
107 #endif // ndef NO_NAMESPACE_GINAC
109 #endif // ndef __GINAC_LORENTZIDX_H__