cuda_toolkit/include/thrust/system/cuda/detail/fill.h

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

THRUST_NAMESPACE_BEGIN
namespace cuda_cub {

namespace __fill {

  // fill functor
  template<class Iterator, class T>
  struct functor
  {
    Iterator it;
    T value;

    THRUST_FUNCTION
    functor(Iterator it, T value)
        : it(it), value(value) {}

    template<class Size>
    THRUST_DEVICE_FUNCTION void operator()(Size idx)
    {
      it[idx] = value;
    }
  }; // struct functor

}    // namespace __fill

template <class Derived, class OutputIterator, class Size, class T>
OutputIterator __host__ __device__
fill_n(execution_policy<Derived>& policy,
       OutputIterator             first,
       Size                       count,
       const T&                   value)
{
  cuda_cub::parallel_for(policy,
                         __fill::functor<OutputIterator, T>(
                         first,
                         value),
                         count);

  return first + count;
}    // func fill_n

template <class Derived, class ForwardIterator, class T>
void __host__ __device__
fill(execution_policy<Derived>& policy,
     ForwardIterator            first,
     ForwardIterator            last,
     const T&                   value)
{
  cuda_cub::fill_n(policy, first, thrust::distance(first,last), value);
} // func filll


} // namespace cuda_cub
THRUST_NAMESPACE_END
#endif