#include <triqs/arrays.hpp>
#include <triqs/arrays/functional/map.hpp>
using triqs::arrays::array;

double f(int i) { return i * 10; }

int main() {
 auto F = triqs::arrays::map(std::function<double(int)>(f));
 array<int, 2> A(2, 2);
 A() = 2;

 array<double, 2> B, C;

 A() = 2;
 B = F(A);
 C = F(2 * A); // works also with expressions of course

 std::cout << "A = " << A << std::endl;
 std::cout << "F(A) = " << B << std::endl;
 std::cout << "F(2*A) = " << C << std::endl;
}