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shift_left - Kokkos documentation

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Header: Kokkos_StdAlgorithms.hpp

Shifts the elements in a range or in view by n positions towards the beginning.

Warning

This is currently inside the Kokkos::Experimental namespace.

template <class ExecutionSpace, class IteratorType>
IteratorType shift_left(const ExecutionSpace& exespace,                 (1)
                        IteratorType first, IteratorType last,
                        typename IteratorType::difference_type n);

template <class ExecutionSpace, class IteratorType>
IteratorType shift_left(const std::string& label,                       (2)
                        const ExecutionSpace& exespace,
                        IteratorType first, IteratorType last,
                        typename IteratorType::difference_type n);

template <class ExecutionSpace, class DataType, class... Properties>
auto shift_left(const ExecutionSpace& exespace,                         (3)
               const Kokkos::View<DataType, Properties...>& view,
               typename decltype(begin(view))::difference_type n);

template <class ExecutionSpace, class DataType, class... Properties>
auto shift_left(const std::string& label,                               (4)
                const ExecutionSpace& exespace,
                const Kokkos::View<DataType, Properties...>& view,
               typename decltype(begin(view))::difference_type n);

Added in version 4.2.

template <class TeamHandleType, class IteratorType>
KOKKOS_FUNCTION
IteratorType shift_left(const TeamHandleType& teamHandle,               (5)
                        IteratorType first, IteratorType last,
                        typename IteratorType::difference_type n);

template <class TeamHandleType, class DataType, class... Properties>
KOKKOS_FUNCTION
auto shift_left(const TeamHandleType& teamHandle,                       (6)
                const Kokkos::View<DataType, Properties...>& view,
                typename decltype(begin(view))::difference_type n);

• exespace: execution space instance

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

• label: string forwarded to internal parallel kernels for debugging purposes

  • 1: The default string is “Kokkos::shift_left_iterator_api_default”.

  • 3: The default string is “Kokkos::shift_left_view_api_default”.

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

• first, last: range of elements to shift

  • must be random access iterators, e.g., returned from Kokkos::Experimental::(c)begin/(c)end

  • must represent a valid range, i.e., last >= first

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

• view: view to modify

  • 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

• n: the number of positions to shift

  • must be non-negative

The end of the resulting range. If n is less than last - first, returns first + (last - first - n). Otherwise, returns first.

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