mirror of
https://github.com/triqs/dft_tools
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69 lines
2.1 KiB
C++
69 lines
2.1 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) 2013 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 <triqs/arrays.hpp>
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#include <iostream>
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namespace triqs { namespace arrays {
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template<typename T> class immutable_diagonal_matrix_view : TRIQS_CONCEPT_TAG_NAME(ImmutableMatrix) {
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array_view<T,1> data;
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public:
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//immutable_diagonal_matrix_view(size_t i=1) : data ( array<T,1>(i)) {}
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immutable_diagonal_matrix_view(array_view<T,1> v) : data (v) {}
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// the ImmutableMatrix concept
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typedef T value_type;
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T operator()(size_t i, size_t j) const { return (i==j ? data(i) : 0);}
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typedef indexmaps::cuboid::domain_t<2> domain_type;
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domain_type domain() const { auto s = data.shape()[0]; return mini_vector<size_t,2>(s,s);}
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//
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friend std::ostream & operator<<(std::ostream & out, immutable_diagonal_matrix_view const & d) { return out<<"diagonal_matrix "<<d.data;}
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};
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}}
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using namespace triqs::arrays;
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int main(int argc, char **argv) {
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auto a = array<int,1> { 1,2,3,4};
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auto d = immutable_diagonal_matrix_view<int>(a);
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std::cout << d<< std::endl;
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std::cout << matrix<int>( 2* d) << std::endl;
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std::cout << matrix<int>( d * d) << std::endl;
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int sum =0;
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foreach (d, [&sum, &d](int i, int j) { sum += d(i,j);});
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std::cout << "sum = "<< sum << std::endl;
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return 0;
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}
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