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edd1ff4529
A first general restructuration of the doc according to the pattern [tour|tutorial|reference]. In the reference part, objects are documented per topic. In each topic, [definition|c++|python|hdf5] (not yet implemented)
43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
#include <triqs/arrays.hpp>
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#include <iostream>
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namespace triqs {
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namespace arrays { // better to put it in this namespace for ADL...
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template <typename T> class immutable_diagonal_matrix_view {
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array_view<T, 1> data; // the diagonal stored as a 1d array
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public:
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immutable_diagonal_matrix_view(array_view<T, 1> v) : data(v) {} // constructor
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// the ImmutableMatrix concept
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typedef indexmaps::cuboid::domain_t<2> domain_type;
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domain_type domain() const {
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auto s = data.shape()[0];
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return {s, s};
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}
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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); } // just kronecker...
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friend std::ostream &operator<<(std::ostream &out, immutable_diagonal_matrix_view const &d) {
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return out << "diagonal_matrix " << d.data;
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}
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};
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// Marking this class as belonging to the Matrix & Vector algebra.
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template <typename T> struct ImmutableMatrix<immutable_diagonal_matrix_view<T>> : std::true_type {};
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}
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}
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/// TESTING
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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 << "domain = " << d.domain() << std::endl;
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std::cout << "d = " << d << std::endl;
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std::cout << "2*d = " << make_matrix(2 * d) << std::endl;
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std::cout << "d*d = " << matrix<int>(d * d) << std::endl;
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}
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