/*
 *  Copyright 2008-2013 NVIDIA Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

#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/system/cuda/config.h>

#  include <thrust/detail/raw_pointer_cast.h>
#  include <thrust/swap.h>
#  include <thrust/system/cuda/detail/execution_policy.h>

#  include <cuda/std/utility>

#  include <nv/target>

THRUST_NAMESPACE_BEGIN
namespace cuda_cub
{

template <typename DerivedPolicy, typename Pointer1, typename Pointer2>
inline _CCCL_HOST_DEVICE void iter_swap(thrust::cuda::execution_policy<DerivedPolicy>&, Pointer1 a, Pointer2 b)
{
  // XXX war nvbugs/881631
  struct war_nvbugs_881631
  {
    _CCCL_HOST inline static void host_path(Pointer1 a, Pointer2 b)
    {
      thrust::swap_ranges(a, a + 1, b);
    }

    _CCCL_DEVICE inline static void device_path(Pointer1 a, Pointer2 b)
    {
      using ::cuda::std::swap;
      swap(*thrust::raw_pointer_cast(a), *thrust::raw_pointer_cast(b));
    }
  };

  NV_IF_TARGET(NV_IS_HOST, (war_nvbugs_881631::host_path(a, b);), (war_nvbugs_881631::device_path(a, b);));

} // end iter_swap()

} // namespace cuda_cub
THRUST_NAMESPACE_END
#endif
