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

generate_n - Kokkos documentation

Header: <Kokkos_StdAlgorithms.hpp>

Assigns the value generated by the functor g in a range of count iterators or each of the first count elements in a rank-1 View.

Warning

This is currently inside the Kokkos::Experimental namespace.

template <class ExecutionSpace, class IteratorType, class Size, class Generator>
IteratorType generate_n(const ExecutionSpace& exespace,                           (1)
                        IteratorType first, Size count,
                        Generator g);

template <class ExecutionSpace, class IteratorType, class Size, class Generator>
IteratorType generate_n(const std::string& label, const ExecutionSpace& exespace, (2)
                        IteratorType first, Size count,
                        Generator g);

template <class ExecutionSpace, class DataType, class... Properties, class Size,
          class Generator>
auto generate_n(const ExecutionSpace& exespace,                                   (3)
                const ::Kokkos::View<DataType, Properties...>& view, Size count,
                Generator g);

template <class ExecutionSpace, class DataType, class... Properties, class Size,
          class Generator>
auto generate_n(const std::string& label, const ExecutionSpace& ex,               (4)
                const ::Kokkos::View<DataType, Properties...>& view, Size count,
                Generator g);

Added in version 4.2.

template <class TeamHandleType, class IteratorType, class Size, class Generator>
KOKKOS_FUNCTION
IteratorType generate_n(const TeamHandleType& teamHandle,                         (5)
                        IteratorType first, Size count,
                        Generator g);

template <class TeamHandleType, class DataType, class... Properties, class Size,
          class Generator>
KOKKOS_FUNCTION
auto generate_n(const TeamHandleType& teamHandle,                                 (6)
                const ::Kokkos::View<DataType, Properties...>& view, Size count,
                Generator g);

• 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

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

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

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

• count: number of elements to assign (must be non-negative)

• first: iterator defining the beginning of range

  • must be random access iterator

  • [first, first+count) must represent a valid range

  • 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

• g: function object called on the all the elements

  • functor of the following form, where return_type must be assignable to value_type, with value_type being the value type of IteratorType (for 1,2,5) or of view (for 3,4,6)

  • must conform to:

  struct Generate
  {
     KOKKOS_INLINE_FUNCTION
     return_type operator()() const{ return /* ... */; }
  };
  

• 1,2,5: an iterator equal to first + count

• 3,4,6: an iterator equal to Kokkos::Experimental::begin(view) + count

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