mirror of
https://github.com/triqs/dft_tools
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79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
/*******************************************************************************
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*
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* TRIQS: a Toolbox for Research in Interacting Quantum Systems
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*
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* Copyright (C) 2011 by O. Parcollet
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*
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* TRIQS is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* TRIQS. If not, see <http://www.gnu.org/licenses/>.
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*
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******************************************************************************/
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#include "./common.hpp"
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#include <iostream>
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#include <triqs/arrays/indexmaps/permutation.hpp>
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using namespace triqs::arrays;
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using namespace triqs::arrays::permutations;
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template<ull F> struct P {
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static constexpr ull value = F;
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friend std::ostream & operator <<( std::ostream & out, P const & s) {
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//out << "Permutation of size " << permutations::size(s.value) << " : "<< std::hex;
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out << std::hex;
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s.print(out, std::integral_constant<ull,0>());
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return out << std::dec;
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}
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template<ull c> void print( std::ostream & out, std::integral_constant<ull,c>) const { out << apply(this->value,c); print(out, std::integral_constant<ull,c+1>());}
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void print( std::ostream & out, std::integral_constant<ull,size(F)>) const {}
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};
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int main(int argc, char **argv) {
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constexpr auto p0= permutation(0,1);
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constexpr auto p= permutation(0,2,1);
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constexpr auto p2= permutation(2,1,0,3);
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constexpr auto pc= permutation(1,2,3,0);
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std::cout << P<permutation(0,1) >() << std::endl;
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std::cout << P<p0>() << std::endl;
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std::cout << P<p>() << std::endl;
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std::cout << P<p2>() << std::endl;
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std::cout << P<pc>() << std::endl;
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#define COMPOSE(P1,P2)\
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std::cout << " composing " << P<P1>() << " and "<< P<P2>() << " = "<< P<permutations::compose(P1,P2)>() << std::endl ;
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#define INVERSE(P1)\
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std::cout << "inverse of "<< P<P1>() << " = "<< P<permutations::inverse(P1)>() << std::endl;\
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std::cout << " checking "<< P<permutations::compose(permutations::inverse(P1),P1)>() << std::endl;
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COMPOSE(p,p);
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COMPOSE(p2,p2);
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INVERSE(p);
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INVERSE(p2);
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INVERSE(pc);
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#define ID(n)\
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std::cout << " identity :" << P<identity(n)>() << std::endl ;\
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std::cout << " ridentity :" << P<ridentity(n)>() << std::endl<<std::endl ;
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ID(1);
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ID(2);
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ID(3);
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ID(4);
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ID(5);
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}
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