text: /*
   * MIT License
   *
   * Copyright (c) 2021 CSCS, ETH Zurich
   *               2021 University of Basel
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  
  /*! @file
   * @brief Traits classes for Domain to manage GPU device acceleration behavior
   *
   * @author Sebastian Keller <sebastian.f.keller@gmail.com>
   */
  
  #pragma once
  
  #include <type_traits>
  
  #include "cstone/primitives/gather.hpp"
  #include "cstone/cuda/gather.cuh"
  
  namespace cstone
  {
  
  struct CpuTag
  {
  };
  struct GpuTag
  {
  };
  
  namespace detail
  {
  
  template<class Accelerator, class = void>
  struct ReorderFunctor
  {
  };
  
  template<class Accelerator>
  struct ReorderFunctor<Accelerator, std::enable_if_t<std::is_same<Accelerator, CpuTag>{}>>
  {
      template<class ValueType, class CodeType, class IndexType>
      using type = CpuGather<ValueType, CodeType, IndexType>;
  };
  
  template<class Accelerator>
  struct ReorderFunctor<Accelerator, std::enable_if_t<std::is_same<Accelerator, GpuTag>{}>>
  {
      template<class ValueType, class CodeType, class IndexType>
      using type = DeviceGather<ValueType, CodeType, IndexType>;
  };
  
  } // namespace detail
  
  //! @brief returns reorder functor type to be used, depending on the accelerator
  template<class Accelerator, class ValueType, class CodeType, class IndexType>
  using ReorderFunctor_t = typename detail::ReorderFunctor<Accelerator>::template type<ValueType, CodeType, IndexType>;
  
  } // namespace cstone
  