X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fcolor.cpp;h=3ff752efb199246d4e4849a5908740756150cd36;hp=9a364c4395427198a842d765c0c057e34a6200b0;hb=aac4cec4d116f0b39daddb35181d1aa85297d4ba;hpb=6d7bf9ee5a7ce05cb3a23dae664e781d7325d7b8 diff --git a/ginac/color.cpp b/ginac/color.cpp index 9a364c43..3ff752ef 100644 --- a/ginac/color.cpp +++ b/ginac/color.cpp @@ -3,7 +3,7 @@ * Implementation of GiNaC's color (SU(3) Lie algebra) objects. */ /* - * GiNaC Copyright (C) 1999-2003 Johannes Gutenberg University Mainz, Germany + * GiNaC Copyright (C) 1999-2020 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 @@ -17,12 +17,9 @@ * * 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 */ -#include -#include - #include "color.h" #include "idx.h" #include "ncmul.h" @@ -35,6 +32,9 @@ #include "archive.h" #include "utils.h" +#include +#include + namespace GiNaC { GINAC_IMPLEMENT_REGISTERED_CLASS(color, indexed) @@ -61,7 +61,6 @@ GINAC_IMPLEMENT_REGISTERED_CLASS_OPT(su3d, tensor, color::color() : representation_label(0) { - tinfo_key = TINFO_color; } DEFAULT_CTOR(su3one) @@ -78,7 +77,6 @@ DEFAULT_CTOR(su3d) * @see color_ONE */ color::color(const ex & b, unsigned char rl) : inherited(b), representation_label(rl) { - tinfo_key = TINFO_color; } /** Construct object with one color index. This constructor is for internal @@ -86,25 +84,28 @@ color::color(const ex & b, unsigned char rl) : inherited(b), representation_labe * @see color_T */ color::color(const ex & b, const ex & i1, unsigned char rl) : inherited(b, i1), representation_label(rl) { - tinfo_key = TINFO_color; } -color::color(unsigned char rl, const exvector & v, bool discardable) : inherited(sy_none(), v, discardable), representation_label(rl) +color::color(unsigned char rl, const exvector & v) : inherited(not_symmetric(), v), representation_label(rl) { - tinfo_key = TINFO_color; } -color::color(unsigned char rl, std::auto_ptr vp) : inherited(sy_none(), vp), representation_label(rl) +color::color(unsigned char rl, exvector && v) : inherited(not_symmetric(), std::move(v)), representation_label(rl) { - tinfo_key = TINFO_color; +} + +return_type_t color::return_type_tinfo() const +{ + return make_return_type_t(representation_label); } ////////// // archiving ////////// -color::color(const archive_node &n, lst &sym_lst) : inherited(n, sym_lst) +void color::read_archive(const archive_node& n, lst& sym_lst) { + inherited::read_archive(n, sym_lst); unsigned rl; n.find_unsigned("label", rl); representation_label = rl; @@ -116,11 +117,11 @@ void color::archive(archive_node &n) const n.add_unsigned("label", representation_label); } -DEFAULT_UNARCHIVE(color) -DEFAULT_ARCHIVING(su3one) -DEFAULT_ARCHIVING(su3t) -DEFAULT_ARCHIVING(su3f) -DEFAULT_ARCHIVING(su3d) +GINAC_BIND_UNARCHIVER(color); +GINAC_BIND_UNARCHIVER(su3one); +GINAC_BIND_UNARCHIVER(su3t); +GINAC_BIND_UNARCHIVER(su3f); +GINAC_BIND_UNARCHIVER(su3d); ////////// // functions overriding virtual functions from base classes @@ -165,11 +166,9 @@ ex color::eval_ncmul(const exvector & v) const s.reserve(v.size()); // Remove superfluous ONEs - exvector::const_iterator it = v.begin(), itend = v.end(); - while (it != itend) { - if (!is_a(it->op(0))) - s.push_back(*it); - it++; + for (auto & it : v) { + if (!is_a(it.op(0))) + s.push_back(it); } if (s.empty()) @@ -183,9 +182,9 @@ ex color::thiscontainer(const exvector & v) const return color(representation_label, v); } -ex color::thiscontainer(std::auto_ptr vp) const +ex color::thiscontainer(exvector && v) const { - return color(representation_label, vp); + return color(representation_label, std::move(v)); } /** Given a vector iv3 of three indices and a vector iv2 of two indices that @@ -194,7 +193,7 @@ ex color::thiscontainer(std::auto_ptr vp) const * * @param iv3 Vector of 3 indices * @param iv2 Vector of 2 indices, must be a subset of iv3 - * @param sig Returs sign introduced by index permutation + * @param sig Returns sign introduced by index permutation * @return the free index (the one that is in iv3 but not in iv2) */ static ex permute_free_index_to_front(const exvector & iv3, const exvector & iv2, int & sig) { @@ -313,7 +312,7 @@ bool su3t::contract_with(exvector::iterator self, exvector::iterator other, exve if (is_exactly_a(other->op(0))) { - // Contraction only makes sense if the represenation labels are equal + // Contraction only makes sense if the representation labels are equal GINAC_ASSERT(is_a(*other)); if (ex_to(*other).get_representation_label() != rl) return false; @@ -333,7 +332,7 @@ bool su3t::contract_with(exvector::iterator self, exvector::iterator other, exve // T.a S T.a = 1/2 Tr(S) - 1/6 S } else { - exvector::iterator it = self + 1; + auto it = self + 1; while (it != other) { if (!is_a(*it)) { return false; @@ -401,9 +400,7 @@ bool su3d::contract_with(exvector::iterator self, exvector::iterator other, exve && ex_to(*self).has_dummy_index_for(other[1].op(1))) { exvector self_indices = ex_to(*self).get_indices(); - exvector dummy_indices; - dummy_indices.push_back(other[0].op(1)); - dummy_indices.push_back(other[1].op(1)); + exvector dummy_indices = {other[0].op(1), other[1].op(1)}; int sig; ex a = permute_free_index_to_front(self_indices, dummy_indices, sig); *self = numeric(5, 6); @@ -454,9 +451,7 @@ bool su3f::contract_with(exvector::iterator self, exvector::iterator other, exve && ex_to(*self).has_dummy_index_for(other[1].op(1))) { exvector self_indices = ex_to(*self).get_indices(); - exvector dummy_indices; - dummy_indices.push_back(other[0].op(1)); - dummy_indices.push_back(other[1].op(1)); + exvector dummy_indices = {other[0].op(1), other[1].op(1)}; int sig; ex a = permute_free_index_to_front(self_indices, dummy_indices, sig); *self = numeric(3, 2) * sig * I; @@ -475,37 +470,44 @@ bool su3f::contract_with(exvector::iterator self, exvector::iterator other, exve ex color_ONE(unsigned char rl) { - return color(su3one(), rl); + static ex ONE = dynallocate(); + return color(ONE, rl); } ex color_T(const ex & a, unsigned char rl) { + static ex t = dynallocate(); + if (!is_a(a)) throw(std::invalid_argument("indices of color_T must be of type idx")); if (!ex_to(a).get_dim().is_equal(8)) throw(std::invalid_argument("index dimension for color_T must be 8")); - return color(su3t(), a, rl); + return color(t, a, rl); } ex color_f(const ex & a, const ex & b, const ex & c) { + static ex f = dynallocate(); + if (!is_a(a) || !is_a(b) || !is_a(c)) throw(std::invalid_argument("indices of color_f must be of type idx")); if (!ex_to(a).get_dim().is_equal(8) || !ex_to(b).get_dim().is_equal(8) || !ex_to(c).get_dim().is_equal(8)) throw(std::invalid_argument("index dimension for color_f must be 8")); - return indexed(su3f(), sy_anti(), a, b, c); + return indexed(f, antisymmetric3(), a, b, c); } ex color_d(const ex & a, const ex & b, const ex & c) { + static ex d = dynallocate(); + if (!is_a(a) || !is_a(b) || !is_a(c)) throw(std::invalid_argument("indices of color_d must be of type idx")); if (!ex_to(a).get_dim().is_equal(8) || !ex_to(b).get_dim().is_equal(8) || !ex_to(c).get_dim().is_equal(8)) throw(std::invalid_argument("index dimension for color_d must be 8")); - return indexed(su3d(), sy_symm(), a, b, c); + return indexed(d, symmetric3(), a, b, c); } ex color_h(const ex & a, const ex & b, const ex & c) @@ -514,18 +516,31 @@ ex color_h(const ex & a, const ex & b, const ex & c) } /** Check whether a given tinfo key (as returned by return_type_tinfo() - * is that of a color object with the specified representation label. */ -static bool is_color_tinfo(unsigned ti, unsigned char rl) + * is that of a color object (with an arbitrary representation label). */ +static bool is_color_tinfo(const return_type_t& ti) { - return ti == (TINFO_color + rl); + return *(ti.tinfo) == typeid(color); } -ex color_trace(const ex & e, unsigned char rl) +/** Extract representation label from tinfo key (as returned by + * return_type_tinfo()). */ +static unsigned char get_representation_label(const return_type_t& ti) +{ + return (unsigned char)ti.rl; +} + +ex color_trace(const ex & e, const std::set & rls) { if (is_a(e)) { - if (ex_to(e).get_representation_label() == rl - && is_a(e.op(0))) + unsigned char rl = ex_to(e).get_representation_label(); + + // Are we taking the trace over this object's representation label? + if (rls.find(rl) == rls.end()) + return e; + + // Yes, all generators are traceless, except for color_ONE + if (is_a(e.op(0))) return _ex3; else return _ex0; @@ -536,8 +551,8 @@ ex color_trace(const ex & e, unsigned char rl) ex prod = _ex1; for (size_t i=0; i(e)) { - if (!is_color_tinfo(e.return_type_tinfo(), rl)) - return _ex0; + unsigned char rl = get_representation_label(e.return_type_tinfo()); - // Expand product, if necessary + // Are we taking the trace over this string's representation label? + if (rls.find(rl) == rls.end()) + return e; + + // Yes, expand product if necessary ex e_expanded = e.expand(); if (!is_a(e_expanded)) - return color_trace(e_expanded, rl); + return color_trace(e_expanded, rls); size_t num = e.nops(); @@ -573,7 +591,7 @@ ex color_trace(const ex & e, unsigned char rl) // + 1/2 h_a(n-1)_an_k Tr T_a1 .. T_a(n-2) T_k const ex &last_index = e.op(num - 1).op(1); const ex &next_to_last_index = e.op(num - 2).op(1); - idx summation_index((new symbol)->setflag(status_flags::dynallocated), 8); + idx summation_index(dynallocate(), 8); exvector v1; v1.reserve(num - 2); @@ -590,11 +608,32 @@ ex color_trace(const ex & e, unsigned char rl) } else if (e.nops() > 0) { // Trace maps to all other container classes (this includes sums) - pointer_to_map_function_1arg fcn(color_trace, rl); + pointer_to_map_function_1arg &> fcn(color_trace, rls); return e.map(fcn); } else return _ex0; } +ex color_trace(const ex & e, const lst & rll) +{ + // Convert list to set + std::set rls; + for (auto & it : rll) { + if (it.info(info_flags::nonnegint)) + rls.insert(ex_to(it).to_int()); + } + + return color_trace(e, rls); +} + +ex color_trace(const ex & e, unsigned char rl) +{ + // Convert label to set + std::set rls; + rls.insert(rl); + + return color_trace(e, rls); +} + } // namespace GiNaC