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MinMax.rst

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MinMax

Specific implementation of ReducerConcept storing both the minimum and maximum values

Header File: <Kokkos_Core.hpp>

Usage

MinMax<T,S>::value_type result;
parallel_reduce(N,Functor,MinMax<T,S>(result));

Synopsis

template<class Scalar, class Space>
class MinMax{
  public:
    typedef MinMax reducer;
    typedef MinMaxScalar<typename std::remove_cv<Scalar>::type> value_type;
    typedef Kokkos::View<value_type, Space> result_view_type;

    KOKKOS_INLINE_FUNCTION
    void join(value_type& dest, const value_type& src) const;

    KOKKOS_INLINE_FUNCTION
    void init(value_type& val) const;

    KOKKOS_INLINE_FUNCTION
    value_type& reference() const;

    KOKKOS_INLINE_FUNCTION
    result_view_type view() const;

    KOKKOS_INLINE_FUNCTION
    MinMax(value_type& value_);

    KOKKOS_INLINE_FUNCTION
    MinMax(const result_view_type& value_);
};

Interface

Additional Information

  • MinMax<T,S>::value_type is Specialization of MinMaxScalar on non-const T
  • MinMax<T,S>::result_view_type is Kokkos::View<T,S,Kokkos::MemoryTraits<Kokkos::Unmanaged>>. Note that the S (memory space) must be the same as the space where the result resides.
  • Requires: Scalar has operator =, operator < and operator > defined. Kokkos::reduction_identity<Scalar>::min() and Kokkos::reduction_identity<Scalar>::max() are a valid expressions.
  • In order to use MinMax with a custom type of Scalar, a template specialization of Kokkos::reduction_identity<CustomType> must be defined. See Built-In Reducers with Custom Scalar Types for details