X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?a=blobdiff_plain;f=ginac%2Fcolor.h;h=cc7ac31e54a5963de6a0b72129c82d202e81206b;hb=df170f5776f614f5a4d5ad245b0448a1e78a0e86;hp=c5c57c5598942080a6f467b4ead100d17c166558;hpb=61b8ecb02c8212efbc15f59face8a9c620dc823c;p=ginac.git diff --git a/ginac/color.h b/ginac/color.h index c5c57c55..cc7ac31e 100644 --- a/ginac/color.h +++ b/ginac/color.h @@ -31,36 +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. The indices used for color objects should not have a - * variance. */ + * representation label (an unsigned 8-bit integer) is used to distinguish + * elements from different Lie algebras (objects with different labels + * commute). 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, exvector * vp); // vp will be deleted // functions overriding virtual functions from base classes protected: + bool match_same_type(const basic & other) const; 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; } + unsigned return_type_tinfo(void) const { return TINFO_color + representation_label; } + + // non-virtual functions in this class +public: + unsigned char get_representation_label(void) 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 */ }; @@ -69,9 +73,9 @@ class su3one : public tensor { GINAC_DECLARE_REGISTERED_CLASS(su3one, 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; + void print(const print_context & c, unsigned level = 0) const; }; /** This class represents an su(3) generator. */ @@ -79,9 +83,10 @@ 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; + void print(const print_context & c, unsigned level = 0) const; + bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const; }; /** This class represents the tensor of antisymmetric su(3) structure @@ -90,9 +95,9 @@ 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; + void print(const print_context & c, unsigned level = 0) const; ex eval_indexed(const basic & i) const; bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const; }; @@ -102,34 +107,35 @@ 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; + void print(const print_context & c, unsigned level = 0) const; ex eval_indexed(const basic & i) const; bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) 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. * @@ -150,6 +156,13 @@ 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