#include <triqs/arrays/array.hpp>
using triqs::arrays::array;
using triqs::arrays::array_view;
using triqs::arrays::range;
int main() {
 array<double, 2> A(3, 3);
 A() = 2.5;
 std::cout << A << std::endl;

 array_view<double, 1> B = A(1, range()); // select the first line of the matrix
 std::cout << "B = " << B << std::endl;
 B(0) = 1;

 std::cout << "A = " << A << std::endl;
}