cuda_toolkit/include/thrust/system/cuda/detail/generate.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 <iterator>
#include <thrust/system/cuda/config.h>

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

THRUST_NAMESPACE_BEGIN
namespace cuda_cub {

// for_each functor
template <class Generator>
struct generate_f
{
  Generator generator;

  THRUST_FUNCTION
  generate_f(Generator generator_) : generator(generator_) {}

  template<class T>
  THRUST_DEVICE_FUNCTION void operator()(T const& value)
  {
    T & lvalue = const_cast<T&>(value);
    lvalue = generator();
  }
};

// for_each_n
template <class Derived,
          class OutputIt,
          class Size,
          class Generator>
OutputIt __host__ __device__
generate_n(execution_policy<Derived> &policy,
           OutputIt                   result,
           Size                       count,
           Generator                  generator)
{
  return cuda_cub::for_each_n(policy,
                              result,
                              count,
                              generate_f<Generator>(generator));
}

  // for_each
template <class Derived,
          class OutputIt,
          class Generator>
void __host__ __device__
generate(execution_policy<Derived> &policy,
         OutputIt                   first,
         OutputIt                   last,
         Generator                  generator)
{
  cuda_cub::generate_n(policy, first, thrust::distance(first, last), generator);
}

}    // namespace cuda_cub
THRUST_NAMESPACE_END
#endif