dft_tools/test/triqs/arrays/reinterpret_view.cpp

/*******************************************************************************
 *
 * TRIQS: a Toolbox for Research in Interacting Quantum Systems
 *
 * Copyright (C) 2013 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 <triqs/arrays.hpp>
#include <iostream>

namespace triqs { namespace arrays {


 template <typename V, int R, typename To, typename... I>
 array_view<V, sizeof...(I)> reinterpret(array<V, R, To> const &a, I... index) {
   return { {make_shape(index...)}, a.storage() };
  }

 // wrong for views
 template <typename V, int R, bool B, typename To, typename ... I>  
  array_view<V, sizeof...(I)> reinterpret_array_view (array_view<V,R,To,B> const & a, I ... index) { 
   if (!has_contiguous_data(a)) TRIQS_RUNTIME_ERROR << "reinterpretation failure : data of the view are not contiguous";
   return { {make_shape(index...)}, a.storage() };
  }

}}

using namespace triqs::arrays;
int main(int argc, char **argv) {
 triqs::arrays::array<long,1> A = {1,2,3,4,5,6};
 std::cout << reinterpret(A, 2,3)<< std::endl;
 //std::cout << reinterpret_array_view(A(range(1,5)), 2,3)<< std::endl;
 return 0;
}