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fill - Kokkos documentation

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Header File: Kokkos_StdAlgorithms.hpp

namespace Kokkos{
namespace Experimental{

template <class ExecutionSpace, class IteratorType, class T>
void fill(const ExecutionSpace& exespace,                                    (1)
          IteratorType first, IteratorType last,
          const T& value);

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

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

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

} //end namespace Experimental
} //end namespace Kokkos

Copy-assigns value to each element in the range [first, last) (overloads 1,2) or in view (overloads 3,4).

• exespace:

  • execution space instance

• label:

  • used to name the implementation kernels for debugging purposes

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

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

• first, last:

  • range of elements to assign to

  • must be random access iterators, e.g., Kokkos::Experimental::begin/end

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

  • must be accessible from exespace

• view:

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

  • must be accessible from exespace

• value:

  • value to assign to each element

None

namespace KE = Kokkos::Experimental;
Kokkos::View<double*> a("a", 13);

KE::fill(Kokkos::DefaultExecutionSpace(), KE::begin(a), KE::end(a), 4.);

// passing the view directly
KE::fill(Kokkos::DefaultExecutionSpace(), a, 22.);

// explicitly set execution space (assuming active)
KE::fill(Kokkos::OpenMP(), KE::begin(a), KE::end(a), 14.);

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