X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Ftensor.h;h=d33603ae8e30133c51a1f7886eab79dad14ec91d;hp=147ab44d9bf7f414d766c598d0f81ba95c5fed83;hb=690cd58cc13ad5052eb5851c573984965d0c40c1;hpb=591b85b0697370f2f5f25a29a1e94ff831a02c12 diff --git a/ginac/tensor.h b/ginac/tensor.h index 147ab44d..d33603ae 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) 1999-2005 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 @@ -17,7 +17,7 @@ * * 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__ @@ -37,11 +37,18 @@ class tensor : public basic // other constructors protected: - tensor(unsigned ti); + tensor(tinfo_t ti) : inherited(ti) {} - // functions overriding virtual functions from bases classes + // 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; }; @@ -51,11 +58,17 @@ class tensdelta : public tensor { GINAC_DECLARE_REGISTERED_CLASS(tensdelta, tensor) - // functions overriding virtual functions from bases classes + // 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; }; @@ -66,11 +79,16 @@ class tensmetric : public tensor { GINAC_DECLARE_REGISTERED_CLASS(tensmetric, tensor) - // functions overriding virtual functions from bases classes + // 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; }; @@ -86,11 +104,17 @@ public: /** Construct Lorentz metric tensor with given signature. */ minkmetric(bool pos_sig); - // functions overriding virtual functions from bases classes + // 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; + // 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,...). */ @@ -105,11 +129,16 @@ class spinmetric : public tensmetric { GINAC_DECLARE_REGISTERED_CLASS(spinmetric, tensmetric) - // functions overriding virtual functions from bases classes + // 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: + void do_print(const print_context & c, unsigned level) const; + void do_print_latex(const print_latex & c, unsigned level) const; }; @@ -124,27 +153,27 @@ class tensepsilon : public tensor public: tensepsilon(bool minkowski, bool pos_sig); - // functions overriding virtual functions from bases classes + // 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; // 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. */ }; // utility functions -/** Return the tensor object handled by an ex. Deprecated: use ex_to(). - * This is unsafe: you need to check the type first. */ -inline const tensor &ex_to_tensor(const ex &e) -{ - return static_cast(*e.bp); -} - /** Create a delta tensor with specified indices. The indices must be of class * idx or a subclass. The delta tensor is always symmetric and its trace is * the dimension of the index space. @@ -212,18 +241,6 @@ 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__