mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 19:53:45 +01:00
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>
|
|
#include <iostream>
|
|
namespace triqs {
|
|
namespace arrays { // better to put it in this namespace for ADL...
|
|
|
|
template <typename T> class immutable_diagonal_matrix_view {
|
|
|
|
array_view<T, 1> data; // the diagonal stored as a 1d array
|
|
|
|
public:
|
|
immutable_diagonal_matrix_view(array_view<T, 1> v) : data(v) {} // constructor
|
|
|
|
// the ImmutableMatrix concept
|
|
typedef indexmaps::cuboid::domain_t<2> domain_type;
|
|
domain_type domain() const {
|
|
auto s = data.shape()[0];
|
|
return {s, s};
|
|
}
|
|
typedef T value_type;
|
|
T operator()(size_t i, size_t j) const { return (i == j ? data(i) : 0); } // just kronecker...
|
|
|
|
friend std::ostream &operator<<(std::ostream &out, immutable_diagonal_matrix_view const &d) {
|
|
return out << "diagonal_matrix " << d.data;
|
|
}
|
|
};
|
|
|
|
// Marking this class as belonging to the Matrix & Vector algebra.
|
|
template <typename T> struct ImmutableMatrix<immutable_diagonal_matrix_view<T>> : std::true_type {};
|
|
}
|
|
}
|
|
|
|
/// TESTING
|
|
using namespace triqs::arrays;
|
|
int main(int argc, char **argv) {
|
|
auto a = array<int, 1>{1, 2, 3, 4};
|
|
auto d = immutable_diagonal_matrix_view<int>{a};
|
|
std::cout << "domain = " << d.domain() << std::endl;
|
|
std::cout << "d = " << d << std::endl;
|
|
std::cout << "2*d = " << make_matrix(2 * d) << std::endl;
|
|
std::cout << "d*d = " << matrix<int>(d * d) << std::endl;
|
|
}
|
|
|