dft_tools/test/triqs/arrays/swap.cpp

/*******************************************************************************
 *
 * TRIQS: a Toolbox for Research in Interacting Quantum Systems
 *
 * Copyright (C) 2011 by O. Parcollet
 *
 * TRIQS is free software: you can redistribute it and/or modify it under the
 * terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * TRIQS. If not, see <http://www.gnu.org/licenses/>.
 *
 ******************************************************************************/
#include "./common.hpp"
#include <triqs/arrays/array.hpp>
#include <triqs/arrays/vector.hpp>
#include <iostream>

namespace tqa=triqs::arrays;

int main(int argc, char **argv) {

 

 std::cout  << "With swap"<< std::endl;
 {
  triqs::arrays::vector<double> V(3),  W(4);;
  V() = 3; W()=4; 

  auto VV = V(tqa::range (0,2));
  auto VW = W(tqa::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;
 
 }

 std::cout  << "With std::swap"<< std::endl;

 {
  triqs::arrays::vector<double> V(3),  W(4);;
  V() = 3; W()=4; 

  std::cout << "V = "<< V << " W = " << W<<  std::endl;
  std::swap(V,W);
  std::cout << "V = "<< V << " W = " << W<< std::endl;
  
  // This does NOT compile, the std::swap specialization is deleted.
  auto VV = V(tqa::range (0,2));
  auto VW = W(tqa::range (0,2));
  //std::swap(VV,VW);

 }
 std::cout  << "With deep_swap"<< std::endl;

 {
  triqs::arrays::vector<double> V(3), W(3);;
  V() = 3; W()=4; 

  auto VV = V(tqa::range (0,2));
  auto VW = W(tqa::range (0,2));

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

 }


 return 0;
}