X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fcolor.h;h=2086909e1304dd1c7a35ac9e53c658263150348c;hp=da53494644e97f95bbcb0871578184855b8a9f50;hb=bc6dacb50cc13691efc466d2cc1900048158ec8d;hpb=7a2377582665c467fc65d6e3a4f60def5f7535ae diff --git a/ginac/color.h b/ginac/color.h index da534946..2086909e 100644 --- a/ginac/color.h +++ b/ginac/color.h @@ -3,7 +3,7 @@ * Interface to GiNaC's color (SU(3) Lie algebra) objects. */ /* - * GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany + * GiNaC Copyright (C) 1999-2004 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 @@ -31,35 +31,40 @@ namespace GiNaC { /** This class holds a generator T_a or the unity element of the Lie algebra * of SU(3), as used for calculations in quantum chromodynamics. A - * representation label (an unsigned integer) is used to distinguish - * elements from different Lie algebra representations (only objects with - * the same label "interact" with each other). These objects implement an - * abstract representation of the group, not a specific matrix - * representation. */ + * representation label (an unsigned 8-bit integer) is used to distinguish + * elements from different Lie algebras (objects with different labels + * commutate). These objects implement an abstract representation of the + * group, not a specific matrix representation. The indices used for color + * objects should not have a variance. */ class color : public indexed { GINAC_DECLARE_REGISTERED_CLASS(color, indexed) // other constructors public: - color(const ex & b, unsigned rl = 0); - color(const ex & b, const ex & i1, unsigned rl = 0); + color(const ex & b, unsigned char rl = 0); + color(const ex & b, const ex & i1, unsigned char rl = 0); // internal constructors - color(unsigned rl, const exvector & v, bool discardable = false); - color(unsigned rl, exvector * vp); // vp will be deleted + color(unsigned char rl, const exvector & v, bool discardable = false); + color(unsigned char rl, std::auto_ptr vp); // functions overriding virtual functions from base classes protected: - ex simplify_ncmul(const exvector & v) const; - ex thisexprseq(const exvector & v) const; - ex thisexprseq(exvector * vp) const; - unsigned return_type(void) const { return return_types::noncommutative; } - unsigned return_type_tinfo(void) const { return TINFO_color; } + ex eval_ncmul(const exvector & v) const; + bool match_same_type(const basic & other) const; + ex thiscontainer(const exvector & v) const; + ex thiscontainer(std::auto_ptr vp) const; + unsigned return_type() const { return return_types::noncommutative; } + unsigned return_type_tinfo() const { return TINFO_color + representation_label; } + + // non-virtual functions in this class +public: + unsigned char get_representation_label() const {return representation_label;} // member variables private: - unsigned representation_label; /**< Representation label to distinguish independent color matrices coming from separated fermion lines */ + unsigned char representation_label; /**< Representation label to distinguish independent color matrices coming from separated fermion lines */ }; @@ -68,9 +73,10 @@ class su3one : public tensor { GINAC_DECLARE_REGISTERED_CLASS(su3one, tensor) - // functions overriding virtual functions from bases classes -public: - void print(std::ostream & os, unsigned upper_precedence=0) 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; }; /** This class represents an su(3) generator. */ @@ -78,9 +84,14 @@ class su3t : public tensor { GINAC_DECLARE_REGISTERED_CLASS(su3t, tensor) - // functions overriding virtual functions from bases classes + // functions overriding virtual functions from base classes public: - void print(std::ostream & os, unsigned upper_precedence=0) 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; }; /** This class represents the tensor of antisymmetric su(3) structure @@ -89,11 +100,15 @@ class su3f : public tensor { GINAC_DECLARE_REGISTERED_CLASS(su3f, tensor) - // functions overriding virtual functions from bases classes + // functions overriding virtual functions from base classes public: - void print(std::ostream & os, unsigned upper_precedence=0) const; -// ex eval_indexed(const basic & i) const; -// bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) 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; }; /** This class represents the tensor of symmetric su(3) structure constants. */ @@ -101,34 +116,39 @@ class su3d : public tensor { GINAC_DECLARE_REGISTERED_CLASS(su3d, tensor) - // functions overriding virtual functions from bases classes + // functions overriding virtual functions from base classes public: - void print(std::ostream & os, unsigned upper_precedence=0) const; -// ex eval_indexed(const basic & i) const; -// bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) 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; }; // global functions -inline const color &ex_to_color(const ex &e) + +/** Specialization of is_exactly_a(obj) for color objects. */ +template<> inline bool is_exactly_a(const basic & obj) { - return static_cast(*e.bp); + return obj.tinfo()==TINFO_color; } - /** Create the su(3) unity element. This is an indexed object, although it * has no indices. * * @param rl Representation label * @return newly constructed unity element */ -ex color_ONE(unsigned rl = 0); +ex color_ONE(unsigned char rl = 0); /** Create an su(3) generator. * * @param a Index * @param rl Representation label * @return newly constructed unity generator */ -ex color_T(const ex & a, unsigned rl = 0); +ex color_T(const ex & a, unsigned char rl = 0); /** Create an su(3) antisymmetric structure constant. * @@ -149,6 +169,13 @@ ex color_d(const ex & a, const ex & b, const ex & c); /** This returns the linear combination d.a.b.c+I*f.a.b.c. */ ex color_h(const ex & a, const ex & b, const ex & c); +/** Calculate the trace of an expression containing color objects with a + * specified representation label. + * + * @param e Expression to take the trace of + * @param rl Representation label */ +ex color_trace(const ex & e, unsigned char rl = 0); + } // namespace GiNaC