/******************************************************************************
 * 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 _CCCL_HAS_CUDA_COMPILER()
#  include <thrust/iterator/permutation_iterator.h>
#  include <thrust/system/cuda/detail/transform.h>

#  include <cuda/std/functional>

THRUST_NAMESPACE_BEGIN
namespace cuda_cub
{

template <class Derived, class ItemsIt, class MapIt, class ResultIt>
void _CCCL_HOST_DEVICE
scatter(execution_policy<Derived>& policy, ItemsIt first, ItemsIt last, MapIt map, ResultIt result)
{
  cuda_cub::transform(policy, first, last, thrust::make_permutation_iterator(result, map), ::cuda::std::__identity{});
}

template <class Derived, class ItemsIt, class MapIt, class StencilIt, class ResultIt, class Predicate>
void _CCCL_HOST_DEVICE scatter_if(
  execution_policy<Derived>& policy,
  ItemsIt first,
  ItemsIt last,
  MapIt map,
  StencilIt stencil,
  ResultIt result,
  Predicate predicate)
{
  cuda_cub::transform_if(
    policy, first, last, stencil, thrust::make_permutation_iterator(result, map), ::cuda::std::__identity{}, predicate);
}

template <class Derived, class ItemsIt, class MapIt, class StencilIt, class ResultIt, class Predicate>
void _CCCL_HOST_DEVICE scatter_if(
  execution_policy<Derived>& policy, ItemsIt first, ItemsIt last, MapIt map, StencilIt stencil, ResultIt result)
{
  cuda_cub::scatter_if(policy, first, last, map, stencil, result, ::cuda::std::__identity{});
}

} // namespace cuda_cub
THRUST_NAMESPACE_END
#endif
