X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Ftensor.h;h=fa1d768f9733286111c9dac14a5de966367f435e;hp=02496ad9da5da77cdc1e38b8e7cdb76da5e7f5d6;hb=2c7d26f82ab2938ccc42372459a6640137a910a1;hpb=cfea748404dec5fb2f2e3310d36eeb6640f13824 diff --git a/ginac/tensor.h b/ginac/tensor.h index 02496ad9..fa1d768f 100644 --- a/ginac/tensor.h +++ b/ginac/tensor.h @@ -3,7 +3,7 @@ * Interface to GiNaC's special tensors. */ /* - * GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany + * GiNaC Copyright (C) 1999-2014 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 @@ -17,17 +17,17 @@ * * 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_TENSOR_H__ -#define __GINAC_TENSOR_H__ +#ifndef GINAC_TENSOR_H +#define GINAC_TENSOR_H #include "ex.h" +#include "archive.h" namespace GiNaC { - /** This class holds one of GiNaC's predefined special tensors such as the * delta and the metric tensors. They are represented without indices. * To attach indices to them, wrap them in an object of class indexed. */ @@ -35,13 +35,16 @@ class tensor : public basic { GINAC_DECLARE_REGISTERED_CLASS(tensor, basic) - // other constructors -protected: - tensor(unsigned ti) : inherited(ti) {} - // functions overriding virtual functions from base classes protected: - unsigned return_type(void) const { return return_types::noncommutative_composite; } + unsigned return_type() const { return return_types::noncommutative_composite; } + + // non-virtual functions in this class +public: + /** Replace dummy index in contracted-with object by the contracting + * object's second index (used internally for delta and metric tensor + * contractions. */ + bool replace_contr_index(exvector::iterator self, exvector::iterator other) const; }; @@ -53,10 +56,17 @@ class tensdelta : public tensor // functions overriding virtual functions from base classes public: - void print(const print_context & c, unsigned level = 0) const; + bool info(unsigned inf) const; ex eval_indexed(const basic & i) const; bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const; + + // non-virtual functions in this class +protected: + unsigned return_type() const { return return_types::commutative; } + void do_print(const print_context & c, unsigned level) const; + void do_print_latex(const print_latex & c, unsigned level) const; }; +GINAC_DECLARE_UNARCHIVER(tensdelta); /** This class represents a general metric tensor which can be used to @@ -68,10 +78,16 @@ class tensmetric : public tensor // functions overriding virtual functions from base classes public: - void print(const print_context & c, unsigned level = 0) const; + bool info(unsigned inf) const; ex eval_indexed(const basic & i) const; bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const; + + // non-virtual functions in this class +protected: + unsigned return_type() const { return return_types::commutative; } + void do_print(const print_context & c, unsigned level) const; }; +GINAC_DECLARE_UNARCHIVER(tensmetric); /** This class represents a Minkowski metric tensor. It has all the @@ -88,13 +104,24 @@ public: // functions overriding virtual functions from base classes public: - void print(const print_context & c, unsigned level = 0) const; + bool info(unsigned inf) const; ex eval_indexed(const basic & i) const; + /** Save (a.k.a. serialize) object into archive. */ + void archive(archive_node& n) const; + /** Read (a.k.a. deserialize) object from archive. */ + void read_archive(const archive_node& n, lst& syms); + // non-virtual functions in this class +protected: + unsigned return_type() const { return return_types::commutative; } + void do_print(const print_context & c, unsigned level) const; + void do_print_latex(const print_latex & c, unsigned level) const; + // member variables private: bool pos_sig; /**< If true, the metric is diag(-1,1,1...). Otherwise it is diag(1,-1,-1,...). */ }; +GINAC_DECLARE_UNARCHIVER(minkmetric); /** This class represents an antisymmetric spinor metric tensor which @@ -107,10 +134,15 @@ class spinmetric : public tensmetric // functions overriding virtual functions from base classes public: - void print(const print_context & c, unsigned level = 0) const; + bool info(unsigned inf) const; ex eval_indexed(const basic & i) const; bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const; + +protected: + void do_print(const print_context & c, unsigned level) const; + void do_print_latex(const print_latex & c, unsigned level) const; }; +GINAC_DECLARE_UNARCHIVER(spinmetric); /** This class represents the totally antisymmetric epsilon tensor. If @@ -126,15 +158,26 @@ public: // functions overriding virtual functions from base classes public: - void print(const print_context & c, unsigned level = 0) const; + bool info(unsigned inf) const; ex eval_indexed(const basic & i) const; bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const; + /** Save (a.k.a. serialize) object into archive. */ + void archive(archive_node& n) const; + /** Read (a.k.a. deserialize) object from archive. */ + void read_archive(const archive_node& n, lst& syms); + // non-virtual functions in this class +protected: + unsigned return_type() const { return return_types::commutative; } + void do_print(const print_context & c, unsigned level) const; + void do_print_latex(const print_latex & c, unsigned level) const; + // member variables private: bool minkowski; /**< If true, tensor is in Minkowski-type space. Otherwise it is in a Euclidean space. */ - bool pos_sig; /**< If true, the metric is assumed to be diag(-1,1,1...). Otherwise it is diag(1,-1,-1,...). This is only relevant if minkowski = true. */ + bool pos_sig; /**< If true, the metric is assumed to be diag(-1,1,1...). Otherwise it is diag(1,-1,-1,...). This is only relevant if minkowski = true. */ }; +GINAC_DECLARE_UNARCHIVER(tensepsilon); // utility functions @@ -206,18 +249,6 @@ ex epsilon_tensor(const ex & i1, const ex & i2, const ex & i3); * @return newly constructed epsilon tensor */ ex lorentz_eps(const ex & i1, const ex & i2, const ex & i3, const ex & i4, bool pos_sig = false); -/** Create an epsilon tensor in a 4-dimensional projection of a D-dimensional - * Minkowski space. It vanishes whenever one of the indices is not in the - * set {0, 1, 2, 3}. - * - * @param i1 First index - * @param i2 Second index - * @param i3 Third index - * @param i4 Fourth index - * @param pos_sig Whether the signature of the metric is positive - * @return newly constructed epsilon tensor */ -ex eps0123(const ex & i1, const ex & i2, const ex & i3, const ex & i4, bool pos_sig = false); - } // namespace GiNaC -#endif // ndef __GINAC_TENSOR_H__ +#endif // ndef GINAC_TENSOR_H