X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fcolor.cpp;h=2693d9266d30a68c32cf851778f3e40c3b74a621;hp=92f890a5f25a4764368a72d606e413dfa8f30a98;hb=fa13c6831b809abdae9eb2c17b33d2eff8e4878c;hpb=b9cd4b49ffbfbf3e1c36a2b594ec3148a5baca64 diff --git a/ginac/color.cpp b/ginac/color.cpp index 92f890a5..2693d926 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) 1999-2001 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 @@ -17,52 +17,57 @@ * * 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 #include "color.h" #include "idx.h" #include "ncmul.h" +#include "symmetry.h" +#include "operators.h" #include "numeric.h" +#include "mul.h" #include "power.h" // for sqrt() #include "symbol.h" -#include "print.h" #include "archive.h" -#include "debugmsg.h" #include "utils.h" namespace GiNaC { GINAC_IMPLEMENT_REGISTERED_CLASS(color, indexed) -GINAC_IMPLEMENT_REGISTERED_CLASS(su3one, tensor) -GINAC_IMPLEMENT_REGISTERED_CLASS(su3t, tensor) -GINAC_IMPLEMENT_REGISTERED_CLASS(su3f, tensor) -GINAC_IMPLEMENT_REGISTERED_CLASS(su3d, tensor) + +GINAC_IMPLEMENT_REGISTERED_CLASS_OPT(su3one, tensor, + print_func(&su3one::do_print). + print_func(&su3one::do_print_latex)) + +GINAC_IMPLEMENT_REGISTERED_CLASS_OPT(su3t, tensor, + print_func(&su3t::do_print). + print_func(&su3t::do_print)) + +GINAC_IMPLEMENT_REGISTERED_CLASS_OPT(su3f, tensor, + print_func(&su3f::do_print). + print_func(&su3f::do_print)) + +GINAC_IMPLEMENT_REGISTERED_CLASS_OPT(su3d, tensor, + print_func(&su3d::do_print). + print_func(&su3d::do_print)) ////////// -// default constructor, destructor, copy constructor assignment operator and helpers +// default constructors ////////// color::color() : representation_label(0) { - debugmsg("color default constructor", LOGLEVEL_CONSTRUCT); tinfo_key = TINFO_color; } -void color::copy(const color & other) -{ - inherited::copy(other); - representation_label = other.representation_label; -} - -DEFAULT_DESTROY(color) -DEFAULT_CTORS(su3one) -DEFAULT_CTORS(su3t) -DEFAULT_CTORS(su3f) -DEFAULT_CTORS(su3d) +DEFAULT_CTOR(su3one) +DEFAULT_CTOR(su3t) +DEFAULT_CTOR(su3f) +DEFAULT_CTOR(su3d) ////////// // other constructors @@ -73,7 +78,6 @@ DEFAULT_CTORS(su3d) * @see color_ONE */ color::color(const ex & b, unsigned char rl) : inherited(b), representation_label(rl) { - debugmsg("color constructor from ex,unsigned char", LOGLEVEL_CONSTRUCT); tinfo_key = TINFO_color; } @@ -82,19 +86,16 @@ 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) { - debugmsg("color constructor from ex,ex,unsigned char", LOGLEVEL_CONSTRUCT); tinfo_key = TINFO_color; } -color::color(unsigned char rl, const exvector & v, bool discardable) : inherited(indexed::unknown, v, discardable), representation_label(rl) +color::color(unsigned char rl, const exvector & v, bool discardable) : inherited(not_symmetric(), v, discardable), representation_label(rl) { - debugmsg("color constructor from unsigned char,exvector", LOGLEVEL_CONSTRUCT); tinfo_key = TINFO_color; } -color::color(unsigned char rl, exvector * vp) : inherited(indexed::unknown, vp), representation_label(rl) +color::color(unsigned char rl, std::auto_ptr vp) : inherited(not_symmetric(), vp), representation_label(rl) { - debugmsg("color constructor from unsigned char,exvector *", LOGLEVEL_CONSTRUCT); tinfo_key = TINFO_color; } @@ -102,9 +103,8 @@ color::color(unsigned char rl, exvector * vp) : inherited(indexed::unknown, vp), // archiving ////////// -color::color(const archive_node &n, const lst &sym_lst) : inherited(n, sym_lst) +color::color(const archive_node &n, lst &sym_lst) : inherited(n, sym_lst) { - debugmsg("color constructor from archive_node", LOGLEVEL_CONSTRUCT); unsigned rl; n.find_unsigned("label", rl); representation_label = rl; @@ -123,12 +123,12 @@ DEFAULT_ARCHIVING(su3f) DEFAULT_ARCHIVING(su3d) ////////// -// functions overriding virtual functions from bases classes +// functions overriding virtual functions from base classes ////////// int color::compare_same_type(const basic & other) const { - GINAC_ASSERT(other.tinfo() == TINFO_color); + GINAC_ASSERT(is_a(other)); const color &o = static_cast(other); if (representation_label != o.representation_label) { @@ -139,6 +139,14 @@ int color::compare_same_type(const basic & other) const return inherited::compare_same_type(other); } +bool color::match_same_type(const basic & other) const +{ + GINAC_ASSERT(is_a(other)); + const color &o = static_cast(other); + + return representation_label == o.representation_label; +} + DEFAULT_COMPARE(su3one) DEFAULT_COMPARE(su3t) DEFAULT_COMPARE(su3f) @@ -151,7 +159,7 @@ DEFAULT_PRINT(su3d, "d") /** Perform automatic simplification on noncommutative product of color * objects. This removes superfluous ONEs. */ -ex color::simplify_ncmul(const exvector & v) const +ex color::eval_ncmul(const exvector & v) const { exvector s; s.reserve(v.size()); @@ -159,23 +167,23 @@ ex color::simplify_ncmul(const exvector & v) const // Remove superfluous ONEs exvector::const_iterator it = v.begin(), itend = v.end(); while (it != itend) { - if (!is_ex_of_type(it->op(0), su3one)) + if (!is_a(it->op(0))) s.push_back(*it); it++; } - if (s.size() == 0) + if (s.empty()) return color(su3one(), representation_label); else - return simplified_ncmul(s); + return hold_ncmul(s); } -ex color::thisexprseq(const exvector & v) const +ex color::thiscontainer(const exvector & v) const { return color(representation_label, v); } -ex color::thisexprseq(exvector * vp) const +ex color::thiscontainer(std::auto_ptr vp) const { return color(representation_label, vp); } @@ -214,13 +222,13 @@ static ex permute_free_index_to_front(const exvector & iv3, const exvector & iv2 /** Automatic symbolic evaluation of indexed symmetric structure constant. */ ex su3d::eval_indexed(const basic & i) const { - GINAC_ASSERT(is_of_type(i, indexed)); + GINAC_ASSERT(is_a(i)); GINAC_ASSERT(i.nops() == 4); - GINAC_ASSERT(is_ex_of_type(i.op(0), su3d)); + GINAC_ASSERT(is_a(i.op(0))); // Convolutions are zero - if (static_cast(i).get_dummy_indices().size() != 0) - return _ex0(); + if (!(static_cast(i).get_dummy_indices().empty())) + return _ex0; // Numeric evaluation if (static_cast(i).all_index_values_are(info_flags::nonnegint)) { @@ -228,7 +236,7 @@ ex su3d::eval_indexed(const basic & i) const // Sort indices int v[3]; for (unsigned j=0; j<3; j++) - v[j] = ex_to_numeric(ex_to_idx(i.op(j + 1)).get_value()).to_int(); + v[j] = ex_to(ex_to(i.op(j + 1)).get_value()).to_int(); if (v[0] > v[1]) std::swap(v[0], v[1]); if (v[0] > v[2]) std::swap(v[0], v[2]); if (v[1] > v[2]) std::swap(v[1], v[2]); @@ -238,18 +246,18 @@ ex su3d::eval_indexed(const basic & i) const // Check for non-zero elements if (CMPINDICES(1,4,6) || CMPINDICES(1,5,7) || CMPINDICES(2,5,6) || CMPINDICES(3,4,4) || CMPINDICES(3,5,5)) - return _ex1_2(); + return _ex1_2; else if (CMPINDICES(2,4,7) || CMPINDICES(3,6,6) || CMPINDICES(3,7,7)) - return _ex_1_2(); + return _ex_1_2; else if (CMPINDICES(1,1,8) || CMPINDICES(2,2,8) || CMPINDICES(3,3,8)) - return sqrt(_ex3())/3; + return sqrt(_ex3)*_ex1_3; else if (CMPINDICES(8,8,8)) - return -sqrt(_ex3())/3; + return sqrt(_ex3)*_ex_1_3; else if (CMPINDICES(4,4,8) || CMPINDICES(5,5,8) || CMPINDICES(6,6,8) || CMPINDICES(7,7,8)) - return -sqrt(_ex3())/6; + return sqrt(_ex3)/_ex_6; else - return _ex0(); + return _ex0; } // No further simplifications @@ -259,9 +267,9 @@ ex su3d::eval_indexed(const basic & i) const /** Automatic symbolic evaluation of indexed antisymmetric structure constant. */ ex su3f::eval_indexed(const basic & i) const { - GINAC_ASSERT(is_of_type(i, indexed)); + GINAC_ASSERT(is_a(i)); GINAC_ASSERT(i.nops() == 4); - GINAC_ASSERT(is_ex_of_type(i.op(0), su3f)); + GINAC_ASSERT(is_a(i.op(0))); // Numeric evaluation if (static_cast(i).all_index_values_are(info_flags::nonnegint)) { @@ -269,7 +277,7 @@ ex su3f::eval_indexed(const basic & i) const // Sort indices, remember permutation sign int v[3]; for (unsigned j=0; j<3; j++) - v[j] = ex_to_numeric(ex_to_idx(i.op(j + 1)).get_value()).to_int(); + v[j] = ex_to(ex_to(i.op(j + 1)).get_value()).to_int(); int sign = 1; if (v[0] > v[1]) { std::swap(v[0], v[1]); sign = -sign; } if (v[0] > v[2]) { std::swap(v[0], v[2]); sign = -sign; } @@ -280,13 +288,13 @@ ex su3f::eval_indexed(const basic & i) const return sign; else if (CMPINDICES(1,4,7) || CMPINDICES(2,4,6) || CMPINDICES(2,5,7) || CMPINDICES(3,4,5)) - return _ex1_2() * sign; + return _ex1_2 * sign; else if (CMPINDICES(1,5,6) || CMPINDICES(3,6,7)) - return _ex_1_2() * sign; + return _ex_1_2 * sign; else if (CMPINDICES(4,5,8) || CMPINDICES(6,7,8)) - return sqrt(_ex3())/2 * sign; + return sqrt(_ex3)/2 * sign; else - return _ex0(); + return _ex0; } // No further simplifications @@ -297,13 +305,18 @@ ex su3f::eval_indexed(const basic & i) const /** Contraction of generator with something else. */ bool su3t::contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const { - GINAC_ASSERT(is_ex_of_type(*self, indexed)); - GINAC_ASSERT(is_ex_of_type(*other, indexed)); + GINAC_ASSERT(is_a(*self)); + GINAC_ASSERT(is_a(*other)); GINAC_ASSERT(self->nops() == 2); - GINAC_ASSERT(is_ex_of_type(self->op(0), su3t)); - unsigned char rl = ex_to_color(*self).get_representation_label(); + GINAC_ASSERT(is_a(self->op(0))); + unsigned char rl = ex_to(*self).get_representation_label(); + + if (is_exactly_a(other->op(0))) { - if (is_ex_exactly_of_type(other->op(0), su3t)) { + // Contraction only makes sense if the represenation labels are equal + GINAC_ASSERT(is_a(*other)); + if (ex_to(*other).get_representation_label() != rl) + return false; // T.a T.a = 4/3 ONE if (other - self == 1) { @@ -313,30 +326,30 @@ bool su3t::contract_with(exvector::iterator self, exvector::iterator other, exve // T.a T.b T.a = -1/6 T.b } else if (other - self == 2 - && is_ex_of_type(self[1], color)) { + && is_a(self[1])) { *self = numeric(-1, 6); - *other = _ex1(); + *other = _ex1; return true; // T.a S T.a = 1/2 Tr(S) - 1/6 S } else { exvector::iterator it = self + 1; while (it != other) { - if (!is_ex_of_type(*it, color)) { + if (!is_a(*it)) { return false; } it++; } it = self + 1; - ex S = _ex1(); + ex S = _ex1; while (it != other) { S *= *it; - *it++ = _ex1(); + *it++ = _ex1; } *self = color_trace(S, rl) * color_ONE(rl) / 2 - S / 6; - *other = _ex1(); + *other = _ex1; return true; } } @@ -347,16 +360,16 @@ bool su3t::contract_with(exvector::iterator self, exvector::iterator other, exve /** Contraction of an indexed symmetric structure constant with something else. */ bool su3d::contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const { - GINAC_ASSERT(is_ex_of_type(*self, indexed)); - GINAC_ASSERT(is_ex_of_type(*other, indexed)); + GINAC_ASSERT(is_a(*self)); + GINAC_ASSERT(is_a(*other)); GINAC_ASSERT(self->nops() == 4); - GINAC_ASSERT(is_ex_of_type(self->op(0), su3d)); + GINAC_ASSERT(is_a(self->op(0))); - if (is_ex_exactly_of_type(other->op(0), su3d)) { + if (is_exactly_a(other->op(0))) { // Find the dummy indices of the contraction - exvector self_indices = ex_to_indexed(*self).get_indices(); - exvector other_indices = ex_to_indexed(*other).get_indices(); + exvector self_indices = ex_to(*self).get_indices(); + exvector other_indices = ex_to(*other).get_indices(); exvector all_indices = self_indices; all_indices.insert(all_indices.end(), other_indices.begin(), other_indices.end()); exvector free_indices, dummy_indices; @@ -365,37 +378,37 @@ bool su3d::contract_with(exvector::iterator self, exvector::iterator other, exve // d.abc d.abc = 40/3 if (dummy_indices.size() == 3) { *self = numeric(40, 3); - *other = _ex1(); + *other = _ex1; return true; // d.akl d.bkl = 5/3 delta.ab } else if (dummy_indices.size() == 2) { exvector a; - back_insert_iterator ita(a); + std::back_insert_iterator ita(a); ita = set_difference(self_indices.begin(), self_indices.end(), dummy_indices.begin(), dummy_indices.end(), ita, ex_is_less()); ita = set_difference(other_indices.begin(), other_indices.end(), dummy_indices.begin(), dummy_indices.end(), ita, ex_is_less()); GINAC_ASSERT(a.size() == 2); *self = numeric(5, 3) * delta_tensor(a[0], a[1]); - *other = _ex1(); + *other = _ex1; return true; } - } else if (is_ex_exactly_of_type(other->op(0), su3t)) { + } else if (is_exactly_a(other->op(0))) { // d.abc T.b T.c = 5/6 T.a if (other+1 != v.end() - && is_ex_exactly_of_type(other[1].op(0), su3t) - && ex_to_indexed(*self).has_dummy_index_for(other[1].op(1))) { + && is_exactly_a(other[1].op(0)) + && ex_to(*self).has_dummy_index_for(other[1].op(1))) { - exvector self_indices = ex_to_indexed(*self).get_indices(); + 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)); int sig; ex a = permute_free_index_to_front(self_indices, dummy_indices, sig); *self = numeric(5, 6); - other[0] = color_T(a, ex_to_color(other[0]).get_representation_label()); - other[1] = _ex1(); + other[0] = color_T(a, ex_to(other[0]).get_representation_label()); + other[1] = _ex1; return true; } } @@ -406,49 +419,49 @@ bool su3d::contract_with(exvector::iterator self, exvector::iterator other, exve /** Contraction of an indexed antisymmetric structure constant with something else. */ bool su3f::contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const { - GINAC_ASSERT(is_ex_of_type(*self, indexed)); - GINAC_ASSERT(is_ex_of_type(*other, indexed)); + GINAC_ASSERT(is_a(*self)); + GINAC_ASSERT(is_a(*other)); GINAC_ASSERT(self->nops() == 4); - GINAC_ASSERT(is_ex_of_type(self->op(0), su3f)); + GINAC_ASSERT(is_a(self->op(0))); - if (is_ex_exactly_of_type(other->op(0), su3f)) { // f*d is handled by su3d class + if (is_exactly_a(other->op(0))) { // f*d is handled by su3d class // Find the dummy indices of the contraction exvector dummy_indices; - dummy_indices = ex_to_indexed(*self).get_dummy_indices(ex_to_indexed(*other)); + dummy_indices = ex_to(*self).get_dummy_indices(ex_to(*other)); // f.abc f.abc = 24 if (dummy_indices.size() == 3) { *self = 24; - *other = _ex1(); + *other = _ex1; return true; // f.akl f.bkl = 3 delta.ab } else if (dummy_indices.size() == 2) { int sign1, sign2; - ex a = permute_free_index_to_front(ex_to_indexed(*self).get_indices(), dummy_indices, sign1); - ex b = permute_free_index_to_front(ex_to_indexed(*other).get_indices(), dummy_indices, sign2); + ex a = permute_free_index_to_front(ex_to(*self).get_indices(), dummy_indices, sign1); + ex b = permute_free_index_to_front(ex_to(*other).get_indices(), dummy_indices, sign2); *self = sign1 * sign2 * 3 * delta_tensor(a, b); - *other = _ex1(); + *other = _ex1; return true; } - } else if (is_ex_exactly_of_type(other->op(0), su3t)) { + } else if (is_exactly_a(other->op(0))) { // f.abc T.b T.c = 3/2 I T.a if (other+1 != v.end() - && is_ex_exactly_of_type(other[1].op(0), su3t) - && ex_to_indexed(*self).has_dummy_index_for(other[1].op(1))) { + && is_exactly_a(other[1].op(0)) + && ex_to(*self).has_dummy_index_for(other[1].op(1))) { - exvector self_indices = ex_to_indexed(*self).get_indices(); + 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)); int sig; ex a = permute_free_index_to_front(self_indices, dummy_indices, sig); *self = numeric(3, 2) * sig * I; - other[0] = color_T(a, ex_to_color(other[0]).get_representation_label()); - other[1] = _ex1(); + other[0] = color_T(a, ex_to(other[0]).get_representation_label()); + other[1] = _ex1; return true; } } @@ -462,37 +475,44 @@ bool su3f::contract_with(exvector::iterator self, exvector::iterator other, exve ex color_ONE(unsigned char rl) { - return color(su3one(), rl); + static ex ONE = (new su3one)->setflag(status_flags::dynallocated); + return color(ONE, rl); } ex color_T(const ex & a, unsigned char rl) { - if (!is_ex_of_type(a, idx)) + static ex t = (new su3t)->setflag(status_flags::dynallocated); + + if (!is_a(a)) throw(std::invalid_argument("indices of color_T must be of type idx")); - if (!ex_to_idx(a).get_dim().is_equal(8)) + 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) { - if (!is_ex_of_type(a, idx) || !is_ex_of_type(b, idx) || !is_ex_of_type(c, idx)) + static ex f = (new su3f)->setflag(status_flags::dynallocated); + + 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_idx(a).get_dim().is_equal(8) || !ex_to_idx(b).get_dim().is_equal(8) || !ex_to_idx(c).get_dim().is_equal(8)) + 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(), indexed::antisymmetric, a, b, c); + return indexed(f, antisymmetric3(), a, b, c); } ex color_d(const ex & a, const ex & b, const ex & c) { - if (!is_ex_of_type(a, idx) || !is_ex_of_type(b, idx) || !is_ex_of_type(c, idx)) + static ex d = (new su3d)->setflag(status_flags::dynallocated); + + 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_idx(a).get_dim().is_equal(8) || !ex_to_idx(b).get_dim().is_equal(8) || !ex_to_idx(c).get_dim().is_equal(8)) + 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(), indexed::symmetric, a, b, c); + return indexed(d, symmetric3(), a, b, c); } ex color_h(const ex & a, const ex & b, const ex & c) @@ -507,48 +527,63 @@ static bool is_color_tinfo(unsigned ti, unsigned char rl) return ti == (TINFO_color + rl); } -ex color_trace(const ex & e, unsigned char rl) +/** Check whether a given tinfo key (as returned by return_type_tinfo() + * is that of a color object (with an arbitrary representation label). */ +static bool is_color_tinfo(unsigned ti) +{ + return (ti & ~0xff) == TINFO_color; +} + +/** Extract representation label from tinfo key (as returned by + * return_type_tinfo()). */ +static unsigned char get_representation_label(unsigned ti) { - if (is_ex_of_type(e, color)) { + return ti & 0xff; +} - if (ex_to_color(e).get_representation_label() == rl - && is_ex_of_type(e.op(0), su3one)) - return _ex3(); - else - return _ex0(); +ex color_trace(const ex & e, const std::set & rls) +{ + if (is_a(e)) { - } else if (is_ex_exactly_of_type(e, add)) { + unsigned char rl = ex_to(e).get_representation_label(); - // Trace of sum = sum of traces - ex sum = _ex0(); - for (unsigned i=0; i(e.op(0))) + return _ex3; + else + return _ex0; + + } else if (is_exactly_a(e)) { // Trace of product: pull out non-color factors - ex prod = _ex1(); - for (unsigned i=0; i(e)) { + + unsigned char rl = get_representation_label(e.return_type_tinfo()); - if (!is_color_tinfo(e.return_type_tinfo(), rl)) - return _ex0(); + // Are we taking the trace over this string's representation label? + if (rls.find(rl) == rls.end()) + return e; - // Expand product, if necessary + // Yes, expand product if necessary ex e_expanded = e.expand(); - if (!is_ex_of_type(e_expanded, ncmul)) - return color_trace(e_expanded, rl); + if (!is_a(e_expanded)) + return color_trace(e_expanded, rls); - unsigned num = e.nops(); + size_t num = e.nops(); if (num == 2) { @@ -572,7 +607,7 @@ ex color_trace(const ex & e, unsigned char rl) exvector v1; v1.reserve(num - 2); - for (int i=0; i 0) { + + // Trace maps to all other container classes (this includes sums) + 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 (lst::const_iterator i = rll.begin(); i != rll.end(); ++i) { + if (i->info(info_flags::nonnegint)) + rls.insert(ex_to(*i).to_int()); } - return _ex0(); + 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