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replace - Kokkos documentation

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Header File: Kokkos_StdAlgorithms.hpp

namespace Kokkos{
namespace Experimental{

template <class ExecutionSpace, class IteratorType, class T>
void replace(const ExecutionSpace& exespace,                                 (1)
             IteratorType first, IteratorType last,
             const T& old_value, const T& new_value);

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

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

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

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

Replaces with new_value all elements that are equal to old_value in the range [first, last) (overloads 1,2) or in view (overloads 3,4). Equality is checked using operator==.

• exespace:

  • execution space instance

• label:

  • used to name the implementation kernels for debugging purposes

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

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

• first, last:

  • range of elements to search in

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

  • must represent a valid range, i.e., last >= first (this condition is 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

• old_value, new_value:

  • self-explanatory

None

namespace KE = Kokkos::Experimental;
Kokkos::View<double*> a("a", 13);
// do something with a
// ...

const double oldValue{2};
const double newValue{34};
KE::replace(Kokkos::DefaultExecutionSpace(), KE::begin(a), KE::end(a), oldValue, newValue);

// explicitly set label and execution space (assuming active)
KE::replace("mylabel", Kokkos::OpenMP(), a, oldValue, newValue);

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