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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/detail/minmax.h>
#  include <thrust/distance.h>
#  include <thrust/system/cuda/detail/reduce.h>

#  include <iterator>

THRUST_NAMESPACE_BEGIN

namespace cuda_cub
{

template <class Derived, class InputIt1, class InputIt2, class T, class ReduceOp, class ProductOp>
T _CCCL_HOST_DEVICE inner_product(
  execution_policy<Derived>& policy,
  InputIt1 first1,
  InputIt1 last1,
  InputIt2 first2,
  T init,
  ReduceOp reduce_op,
  ProductOp product_op)
{
  typedef typename iterator_traits<InputIt1>::difference_type size_type;
  size_type num_items = static_cast<size_type>(thrust::distance(first1, last1));
  typedef transform_pair_of_input_iterators_t<T, InputIt1, InputIt2, ProductOp> binop_iterator_t;

  return cuda_cub::reduce_n(policy, binop_iterator_t(first1, first2, product_op), num_items, init, reduce_op);
}

template <class Derived, class InputIt1, class InputIt2, class T>
T _CCCL_HOST_DEVICE
inner_product(execution_policy<Derived>& policy, InputIt1 first1, InputIt1 last1, InputIt2 first2, T init)
{
  return cuda_cub::inner_product(policy, first1, last1, first2, init, plus<T>(), multiplies<T>());
}

} // namespace cuda_cub

THRUST_NAMESPACE_END
#endif