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 * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
 * Modifications Copyright (c) 2019, Advanced Micro Devices, Inc.  All rights reserved.
 *
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 * modification, are permitted provided that the following conditions are met:
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 *       notice, this list of conditions and the following disclaimer.
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 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
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#pragma once

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

THRUST_NAMESPACE_BEGIN
namespace hip_rocprim
{

template <class Derived, class MapIt, class ItemsIt, class ResultIt>
ResultIt THRUST_HIP_FUNCTION
gather(execution_policy<Derived>& policy,
       MapIt                      map_first,
       MapIt                      map_last,
       ItemsIt                    items,
       ResultIt                   result)
{
    return hip_rocprim::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 THRUST_HIP_FUNCTION
gather_if(execution_policy<Derived>& policy,
          MapIt                      map_first,
          MapIt                      map_last,
          StencilIt                  stencil,
          ItemsIt                    items,
          ResultIt                   result,
          Predicate                  predicate)
{
    return hip_rocprim::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 THRUST_HIP_FUNCTION
gather_if(execution_policy<Derived>& policy,
          MapIt                      map_first,
          MapIt                      map_last,
          StencilIt                  stencil,
          ItemsIt                    items,
          ResultIt                   result)
{
    return hip_rocprim::gather_if(
        policy, map_first, map_last, stencil, items, result, identity()
    );
}

} // namespace hip_rocprim
THRUST_NAMESPACE_END

#endif
