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#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/config.h>

#  include <thrust/distance.h>
#  include <thrust/system/cuda/detail/parallel_for.h>
#  include <thrust/system/cuda/execution_policy.h>

THRUST_NAMESPACE_BEGIN
namespace cuda_cub
{

namespace __tabulate
{

template <class Iterator, class TabulateOp, class Size>
struct functor
{
  Iterator items;
  TabulateOp op;

  _CCCL_HOST_DEVICE functor(Iterator items_, TabulateOp op_)
      : items(items_)
      , op(op_)
  {}

  void _CCCL_DEVICE operator()(Size idx)
  {
    items[idx] = op(idx);
  }
}; // struct functor

} // namespace __tabulate

template <class Derived, class Iterator, class TabulateOp>
void _CCCL_HOST_DEVICE tabulate(execution_policy<Derived>& policy, Iterator first, Iterator last, TabulateOp tabulate_op)
{
  typedef typename iterator_traits<Iterator>::difference_type size_type;

  size_type count = thrust::distance(first, last);

  typedef __tabulate::functor<Iterator, TabulateOp, size_type> functor_t;

  cuda_cub::parallel_for(policy, functor_t(first, tabulate_op), count);
}

} // namespace cuda_cub
THRUST_NAMESPACE_END
#endif