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

remove_if - Kokkos documentation

Header: Kokkos_StdAlgorithms.hpp

Removes all elements for which pred returns true, by shifting via move assignment the elements in a range or in View such that the elements not to be removed appear in the beginning of the range or in the beginning of View. Relative order of the elements that remain is preserved and the physical size of the container is unchanged.

Warning

This is currently inside the Kokkos::Experimental namespace.

template <class ExecutionSpace, class Iterator, class UnaryPredicate>
Iterator remove_if(const ExecutionSpace& exespace,                           (1)
                   Iterator first, Iterator last,
                   UnaryPredicate pred);

template <class ExecutionSpace, class Iterator, class UnaryPredicate>
Iterator remove_if(const std::string& label,                                 (2)
                   const ExecutionSpace& exespace,
                   Iterator first, Iterator last,
                   UnaryPredicate pred);

template <
  class ExecutionSpace,
  class DataType, class... Properties,
  class UnaryPredicate>
auto remove_if(const ExecutionSpace& exespace,                               (3)
               const Kokkos::View<DataType, Properties...>& view,
               UnaryPredicate pred);

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

Added in version 4.2.

template <class TeamHandleType, class Iterator, class UnaryPredicate>
KOKKOS_FUNCTION
Iterator remove_if(const TeamHandleType& teamHandle,                         (5)
                   Iterator first, Iterator last,
                   UnaryPredicate pred);

template <
  class TeamHandleType,
  class DataType, class... Properties,
  class UnaryPredicate>
KOKKOS_FUNCTION
auto remove_if(const TeamHandleType& teamHandle,                             (6)
               const Kokkos::View<DataType, Properties...>& view,
               UnaryPredicate pred);

• exespace, first, last, view: same as in remove

• 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::remove_if_iterator_api_default”.

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

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

• pred:

  • unary predicate returning true for the required element to replace; pred(v) must be valid to be called from the execution space passed or the execution space associated with the team handle, and convertible to bool for every argument v of type (possible const) value_type, where value_type is the value type of Iterator (for 1,2,5) or the value type of view (for 3,4,6), and must not modify v.

  • must conform to:

  struct Predicate
  {
    KOKKOS_INLINE_FUNCTION
    bool operator()(const value_type & v) const { return /* ... */; }
  
    // or, also valid
  
    KOKKOS_INLINE_FUNCTION
    bool operator()(value_type v) const { return /* ... */; }
  };
  

Iterator to the element after the new logical end.

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