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Showing content from https://kokkos.github.io/kokkos-core-wiki/API/algorithms/std-algorithms/all/StdCopyBackward.html below:

copy_backward - Kokkos documentation

Header: <Kokkos_StdAlgorithms.hpp>

Copies the elements in reverse order from range [first_from, last_from) to another range ending at last_to or from a source view view_from to a destination view view_to. The relative order is preserved.

Warning

This is currently inside the Kokkos::Experimental namespace.

template <class ExecutionSpace, class InputIteratorType, class OutputIteratorType>
OutputIteratorType copy_backward(const ExecutionSpace& exespace,                (1)
                                 InputIteratorType first_from,
                                 InputIteratorType last_from,
                                 OutputIteratorType last_to);

template <class ExecutionSpace, class InputIteratorType, class OutputIteratorType>
OutputIteratorType copy_backward(const std::string& label,
                                 const ExecutionSpace& exespace,                (2)
                                 InputIteratorType first_from,
                                 InputIteratorType last_from,
                                 OutputIteratorType last_to);

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

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

Added in version 4.2.

template <class TeamHandleType, class InputIteratorType, class OutputIteratorType>
KOKKOS_FUNCTION
OutputIteratorType copy_backward(const TeamHandleType& teamHandle,             (5)
                                 InputIteratorType first_from,
                                 InputIteratorType last_from,
                                 OutputIteratorType last_to);

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

• exespace: execution space instance

• teamHandle: team handle instance given inside a parallel region when using a TeamPolicy

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

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

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

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

• first_from, last_from: range of elements to copy from

  • must be random access iterators

  • must represent a valid range, i.e., last_from >= first_from (checked in debug mode)

  • must be accessible from exespace or from the execution space associated with the team handle

• last_to: iterator past the last element of the range to copy to

  • must be a random access iterator

  • must be accessible from exespace or from the execution space associated with the team handle

• view_from, view_to: source and destination views to copy elements from and to

  • must be rank-1, and have LayoutLeft, LayoutRight, or LayoutStride

  • must be accessible from exespace or from the execution space associated with the team handle

Iterator to the last element copied.

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