#include <triqs/arrays.hpp>
#include <iostream>
using triqs::arrays::vector;
using triqs::arrays::range;
int main() {
 triqs::arrays::vector<double> V(3), W(4);
 V() = 3;
 W() = 4; // initialize
 auto VV = V(range(0, 2));
 auto VW = W(range(0, 2));

 std::cout << "V = " << V << " W = " << W << " V view " << VV << " W view " << VW << std::endl;
 swap(V, W);
 std::cout << "V = " << V << " W = " << W << " V view " << VV << " W view " << VW << std::endl;
 swap(VV, VW);
 std::cout << "V = " << V << " W = " << W << " V view " << VV << " W view " << VW << std::endl;
}