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count - Kokkos documentation

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Header: <Kokkos_StdAlgorithms.hpp>

Returns the number of elements in a range or in rank-1 View that are equal to a target value.

Warning

This is currently inside the Kokkos::Experimental namespace.

template <class ExecutionSpace, class IteratorType, class T>
typename IteratorType::difference_type count(const ExecutionSpace& exespace,
                                             IteratorType first,
                                             IteratorType last,                      (1)
                                             const T& value);

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

template <class ExecutionSpace, class DataType, class... Properties, class T>
auto count(const ExecutionSpace& exespace,                                           (3)
           const ::Kokkos::View<DataType, Properties...>& view, const T& value);

template <class ExecutionSpace, class DataType, class... Properties, class T>
auto count(const std::string& label, const ExecutionSpace& exespace,                 (4)
           const ::Kokkos::View<DataType, Properties...>& view,
           const T& value);

Added in version 4.2.

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

template <class TeamHandleType, class DataType, class... Properties, class T>
KOKKOS_FUNCTION
auto count(const TeamHandleType& teamHandle,                                         (6)
           const ::Kokkos::View<DataType, Properties...>& view,
           const T& value);

• 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::count_iterator_api_default”.

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

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

• first, last: range of elements to search in

  • 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:

  • 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

Returns the number of elements in the range first, last or in view that are equal to value.

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