CIC.h

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//
// Class CIC
//   First order/cloud-in-cell grid interpolation. Currently implemented as
//   global functions, but in order to support higher or lower order interpolation,
//   these should be moved into structs.
//
#ifndef CIC_INTERPOLATION_H
#define CIC_INTERPOLATION_H
 
namespace ippl {
    namespace detail {
        template <unsigned long Point, unsigned long Index, typename Weights>
        KOKKOS_INLINE_FUNCTION constexpr typename Weights::value_type interpolationWeight(
            const Weights& wlo, const Weights& whi);

        template <unsigned long Point, unsigned long Index, typename Indices>
        KOKKOS_INLINE_FUNCTION constexpr typename Indices::value_type interpolationIndex(
            const Indices& args);

        template <unsigned long ScatterPoint, unsigned long... Index, typename View, typename T,
                  typename IndexType = size_t>
        KOKKOS_INLINE_FUNCTION constexpr void scatterToPoint(
            const std::index_sequence<Index...>&, const View& view,
            const Vector<T, View::rank>& wlo, const Vector<T, View::rank>& whi,
            const Vector<IndexType, View::rank>& args, const T& val);

        template <unsigned long... ScatterPoint, typename View, typename T,
                  typename IndexType = size_t>
        KOKKOS_INLINE_FUNCTION constexpr void scatterToField(
            const std::index_sequence<ScatterPoint...>&, const View& view,
            const Vector<T, View::rank>& wlo, const Vector<T, View::rank>& whi,
            const Vector<IndexType, View::rank>& args, T val = 1);

        template <unsigned long GatherPoint, unsigned long... Index, typename View, typename T,
                  typename IndexType = size_t>
        KOKKOS_INLINE_FUNCTION constexpr typename View::value_type gatherFromPoint(
            const std::index_sequence<Index...>&, const View& view,
            const Vector<T, View::rank>& wlo, const Vector<T, View::rank>& whi,
            const Vector<IndexType, View::rank>& args);

        template <unsigned long... GatherPoint, typename View, typename T,
                  typename IndexType = size_t>
        KOKKOS_INLINE_FUNCTION constexpr typename View::value_type gatherFromField(
            const std::index_sequence<GatherPoint...>&, const View& view,
            const Vector<T, View::rank>& wlo, const Vector<T, View::rank>& whi,
            const Vector<IndexType, View::rank>& args);
    }  // namespace detail
}  // namespace ippl
 
#include "Interpolation/CIC.hpp"
 
#endif