/******************************************************************************
 * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the NVIDIA CORPORATION nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 ******************************************************************************/
#pragma once

#include <thrust/detail/config.h>

#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
#  pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
#  pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
#  pragma system_header
#endif // no system header

#if THRUST_DEVICE_COMPILER == THRUST_DEVICE_COMPILER_NVCC
#include <thrust/system/cuda/detail/transform.h>
#include <thrust/iterator/permutation_iterator.h>

THRUST_NAMESPACE_BEGIN
namespace cuda_cub {

template <class Derived,
          class MapIt,
          class ItemsIt,
          class ResultIt>
ResultIt __host__ __device__
gather(execution_policy<Derived>& policy,
    MapIt map_first,
    MapIt map_last,
    ItemsIt items,
    ResultIt result)
{
  return cuda_cub::transform(policy,
                          thrust::make_permutation_iterator(items, map_first),
                          thrust::make_permutation_iterator(items, map_last),
                          result,
                          identity());
}


template <class Derived,
          class MapIt,
          class StencilIt,
          class ItemsIt,
          class ResultIt,
          class Predicate>
ResultIt __host__ __device__
gather_if(execution_policy<Derived>& policy,
          MapIt                      map_first,
          MapIt                      map_last,
          StencilIt                  stencil,
          ItemsIt                    items,
          ResultIt                   result,
          Predicate                  predicate)
{
  return cuda_cub::transform_if(policy,
                              thrust::make_permutation_iterator(items, map_first),
                              thrust::make_permutation_iterator(items, map_last),
                              stencil,
                              result,
                              identity(),
                              predicate);
}

template <class Derived,
          class MapIt,
          class StencilIt,
          class ItemsIt,
          class ResultIt>
ResultIt __host__ __device__
gather_if(execution_policy<Derived>& policy,
          MapIt                      map_first,
          MapIt                      map_last,
          StencilIt                  stencil,
          ItemsIt                    items,
          ResultIt                   result)
{
  return cuda_cub::gather_if(policy,
                          map_first,
                          map_last,
                          stencil,
                          items,
                          result,
                          identity());
}


} // namespace cuda_cub
THRUST_NAMESPACE_END

#endif
