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copy_n - Kokkos documentation

Header: <Kokkos_StdAlgorithms.hpp>

Copies the first n elements from a source range or rank-1 View to another range or rank-1 View.

Warning

This is currently inside the Kokkos::Experimental namespace.

template <
  class ExecutionSpace, class InputIteratorType,
  class SizeType, class OutputIteratorType>
OutputIteratorType copy_n(const ExecutionSpace& exespace,                    (1)
                          InputIteratorType first_from,
                          SizeType n,
                          OutputIteratorType first_to);

template <
  class ExecutionSpace, class InputIteratorType,
  class SizeType, class OutputIteratorType>
OutputIteratorType copy_n(const std::string & label,
                          const ExecutionSpace& exespace,                    (2)
                          InputIteratorType first_from,
                          SizeType n,
                          OutputIteratorType first_to);

template <
  class ExecutionSpace,
  class DataType1, class... Properties1,
  class SizeType,
  class DataType2, class... Properties2>
auto copy_n(const ExecutionSpace& exespace,                                  (3)
            const Kokkos::View<DataType1, Properties1...>& view_from,
            SizeType n,
            const Kokkos::View<DataType2, Properties2...>& view_to);

template <
  class ExecutionSpace,
  class DataType1, class... Properties1,
  class SizeType,
  class DataType2, class... Properties2>
auto copy_n(const std::string& label, const ExecutionSpace& exespace,        (4)
            const Kokkos::View<DataType1, Properties1...>& view_from,
            SizeType n,
            const Kokkos::View<DataType2, Properties2...>& view_to);

Added in version 4.2.

template <
  class TeamHandleType, class InputIteratorType,
  class SizeType, class OutputIteratorType>
KOKKOS_FUNCTION
OutputIteratorType copy_n(const TeamHandleType& teamHandle,                 (5)
                          InputIteratorType first_from,
                          SizeType n,
                          OutputIteratorType first_to);

template <
  class TeamHandleType,
  class DataType1, class... Properties1, class SizeType,
  class DataType2, class... Properties2>
KOKKOS_FUNCTION
auto copy_n(const TeamHandleType& teamHandle,                               (6)
            const ::Kokkos::View<DataType1, Properties1...>& view_from,
            SizeType n,
            ::Kokkos::View<DataType2, Properties2...>& view_to);

• exespace, teamHandle, first_from, first_to, view_from, view_to: same as in copy

• label: used to name the implementation kernels for debugging purposes

  • for 1, the default string is: “Kokkos::copy_n_if_iterator_api_default”

  • for 3, the default string is: “Kokkos::copy_n_if_view_api_default”

  • NOTE: overloads accepting a team handle do not use a label internally

• n: number of elements to copy (must be non-negative)

If n>0, returns an iterator to the destination element after the last element copied.

Otherwise, returns first_to (for 1,2,5) or Kokkos::begin(view_to) (for 3,4,6).

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