cuda_toolkit/include/thrust/system/cuda/detail/copy.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

#include <thrust/advance.h>

#include <thrust/system/cuda/config.h>
#include <thrust/system/cuda/detail/cdp_dispatch.h>
#include <thrust/system/cuda/detail/execution_policy.h>
#include <thrust/system/cuda/detail/cross_system.h>

THRUST_NAMESPACE_BEGIN

template <typename DerivedPolicy, typename InputIt, typename OutputIt>
__host__ __device__ OutputIt
copy(const thrust::detail::execution_policy_base<DerivedPolicy> &exec,
     InputIt                                                     first,
     InputIt                                                     last,
     OutputIt                                                    result);

template <class DerivedPolicy, class InputIt, class Size, class OutputIt>
__host__ __device__ OutputIt
copy_n(const thrust::detail::execution_policy_base<DerivedPolicy> &exec,
       InputIt                                                     first,
       Size                                                        n,
       OutputIt                                                    result);

namespace cuda_cub {

// D->D copy requires NVCC compiler
template <class System,
          class InputIterator,
          class OutputIterator>
OutputIterator __host__ __device__
copy(execution_policy<System> &system,
     InputIterator             first,
     InputIterator             last,
     OutputIterator            result);

template <class System1,
          class System2,
          class InputIterator,
          class OutputIterator>
OutputIterator __host__
copy(cross_system<System1, System2> systems,
     InputIterator  first,
     InputIterator  last,
     OutputIterator result);

template <class System,
          class InputIterator,
          class Size,
          class OutputIterator>
OutputIterator __host__ __device__
copy_n(execution_policy<System> &system,
       InputIterator             first,
       Size                      n,
       OutputIterator            result);

template <class System1,
          class System2,
          class InputIterator,
          class Size,
          class OutputIterator>
OutputIterator __host__
copy_n(cross_system<System1, System2> systems,
       InputIterator  first,
       Size           n,
       OutputIterator result);

}    // namespace cuda_
THRUST_NAMESPACE_END



#include <thrust/system/cuda/detail/internal/copy_device_to_device.h>
#include <thrust/system/cuda/detail/internal/copy_cross_system.h>
#include <thrust/system/cuda/detail/par_to_seq.h>

THRUST_NAMESPACE_BEGIN
namespace cuda_cub {


#if THRUST_DEVICE_COMPILER == THRUST_DEVICE_COMPILER_NVCC
// D->D copy requires NVCC compiler

__thrust_exec_check_disable__
template <class System,
          class InputIterator,
          class OutputIterator>
OutputIterator __host__ __device__
copy(execution_policy<System> &system,
     InputIterator             first,
     InputIterator             last,
     OutputIterator            result)
{
  THRUST_CDP_DISPATCH(
    (result = __copy::device_to_device(system, first, last, result);),
    (result =
       thrust::copy(cvt_to_seq(derived_cast(system)), first, last, result);));
  return result;
}    // end copy()

__thrust_exec_check_disable__
template <class System,
          class InputIterator,
          class Size,
          class OutputIterator>
OutputIterator __host__ __device__
copy_n(execution_policy<System> &system,
       InputIterator             first,
       Size                      n,
       OutputIterator            result)
{
  THRUST_CDP_DISPATCH(
    (result = __copy::device_to_device(system,
                                       first,
                                       thrust::next(first, n),
                                       result);),
    (result =
       thrust::copy_n(cvt_to_seq(derived_cast(system)), first, n, result);));
  return result;
} // end copy_n()
#endif

template <class System1,
          class System2,
          class InputIterator,
          class OutputIterator>
OutputIterator __host__
copy(cross_system<System1, System2> systems,
     InputIterator  first,
     InputIterator  last,
     OutputIterator result)
{
  return __copy::cross_system_copy(systems,first,last,result);
} // end copy()

template <class System1,
          class System2,
          class InputIterator,
          class Size,
          class OutputIterator>
OutputIterator __host__
copy_n(cross_system<System1, System2> systems,
       InputIterator  first,
       Size           n,
       OutputIterator result)
{
  return __copy::cross_system_copy_n(systems, first, n, result);
} // end copy_n()


}    // namespace cuda_cub
THRUST_NAMESPACE_END

#include <thrust/memory.h>
#include <thrust/detail/temporary_array.h>