// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// SPDX-FileCopyrightText: Copyright Contributors to the Kokkos project

/// \file Kokkos_DynRankView.hpp
/// \brief Declaration and definition of Kokkos::DynRankView.
///
/// This header file declares and defines Kokkos::DynRankView and its
/// related nonmember functions.

#ifndef KOKKOS_DYNRANKVIEW_HPP
#define KOKKOS_DYNRANKVIEW_HPP
#ifndef KOKKOS_IMPL_PUBLIC_INCLUDE
#define KOKKOS_IMPL_PUBLIC_INCLUDE
#define KOKKOS_IMPL_PUBLIC_INCLUDE_NOTDEFINED_DYNRANKVIEW
#endif

#include <Kokkos_Macros.hpp>
#ifdef KOKKOS_ENABLE_EXPERIMENTAL_CXX20_MODULES
import kokkos.core;
import kokkos.core_impl;
#else
#include <Kokkos_Core.hpp>
#endif
#include <KokkosExp_InterOp.hpp>
#include <impl/Kokkos_Error.hpp>
#include <type_traits>

namespace Kokkos {

template <typename DataType, class... Properties>
class DynRankView;  // forward declare

namespace Impl {

template <class T, size_t Rank>
struct ViewDataTypeFromRank {
  using type = typename ViewDataTypeFromRank<T, Rank - 1>::type*;
};

template <class T>
struct ViewDataTypeFromRank<T, 0> {
  using type = T;
};

template <unsigned N, typename T, typename... Args>
KOKKOS_FUNCTION View<typename ViewDataTypeFromRank<T, N>::type, Args...>
as_view_of_rank_n(
    DynRankView<T, Args...> v,
    std::enable_if_t<std::is_same_v<typename ViewTraits<T, Args...>::specialize,
                                    void>>* = nullptr);

// TODO: Replace this specialized with a bool
template <typename Specialize>
struct DynRankDimTraits {
  enum : size_t { unspecified = KOKKOS_INVALID_INDEX };

  // Compute the rank of the view from the nonzero dimension arguments.
  KOKKOS_INLINE_FUNCTION
  static size_t computeRank(const size_t N0, const size_t N1, const size_t N2,
                            const size_t N3, const size_t N4, const size_t N5,
                            const size_t N6, const size_t N7) {
    return (N0 != unspecified) + (N1 != unspecified) + (N2 != unspecified) +
           (N3 != unspecified) + (N4 != unspecified) + (N5 != unspecified) +
           (N6 != unspecified) + (N7 != unspecified);
  }

  // Compute the rank of the view from the nonzero layout arguments.
  template <typename Layout>
  KOKKOS_INLINE_FUNCTION static size_t computeRank(const Layout& layout) {
    return computeRank(layout.dimension[0], layout.dimension[1],
                       layout.dimension[2], layout.dimension[3],
                       layout.dimension[4], layout.dimension[5],
                       layout.dimension[6], layout.dimension[7]);
  }

  // Extra overload to match that for specialize types v2
  template <typename Layout, typename... P>
  KOKKOS_INLINE_FUNCTION static size_t computeRank(
      const Kokkos::Impl::ViewCtorProp<P...>& /* prop */,
      const Layout& layout) {
    return computeRank(layout);
  }

  // Create the layout for the rank-7 view.
  // Because the underlying View is rank-7, preserve "unspecified" for
  // dimension 8.

  // Non-strided Layout
  template <typename Layout>
  KOKKOS_INLINE_FUNCTION static std::enable_if_t<
      (std::is_same_v<Layout, Kokkos::LayoutRight> ||
       std::is_same_v<Layout, Kokkos::LayoutLeft>),
      Layout>
  createLayout(const Layout& layout,
               [[maybe_unused]] size_t new_rank = unspecified) {
    Layout new_layout(
        layout.dimension[0] != unspecified ? layout.dimension[0] : 1,
        layout.dimension[1] != unspecified ? layout.dimension[1] : 1,
        layout.dimension[2] != unspecified ? layout.dimension[2] : 1,
        layout.dimension[3] != unspecified ? layout.dimension[3] : 1,
        layout.dimension[4] != unspecified ? layout.dimension[4] : 1,
        layout.dimension[5] != unspecified ? layout.dimension[5] : 1,
        layout.dimension[6] != unspecified ? layout.dimension[6] : 1,
        layout.dimension[7] != unspecified ? layout.dimension[7] : unspecified);

#ifndef KOKKOS_ENABLE_IMPL_VIEW_LEGACY
    // In order to have a valid LayoutRight stride when Sacado passes through
    // extra integer arguments, we need to set it to the dimension[6] for the
    // rank-7 view coming out of here. Only if the original layout was already
    // rank-7 we can preserve the stride.
    // FIXME_SACADO
    if constexpr (!std::is_same_v<Specialize, void> &&
                  std::is_same_v<Layout, Kokkos::LayoutRight>) {
      if (layout.dimension[6] == unspecified) {
        new_layout.stride = unspecified;
      } else {
        new_layout.stride = layout.stride;
      }
    } else
#endif
      new_layout.stride = layout.stride;
    if constexpr (std::is_same_v<Layout, Kokkos::LayoutRight>) {
      if (new_rank != unspecified && new_rank > 0 &&
          layout.dimension[new_rank - 1] == layout.stride)
        new_layout.stride = unspecified;
    }
    return new_layout;
  }

  // LayoutStride
  template <typename Layout>
  KOKKOS_INLINE_FUNCTION static std::enable_if_t<
      (std::is_same_v<Layout, Kokkos::LayoutStride>), Layout>
  createLayout(const Layout& layout,
               [[maybe_unused]] size_t new_rank = unspecified) {
    return Layout(
        layout.dimension[0] != unspecified ? layout.dimension[0] : 1,
        layout.stride[0],
        layout.dimension[1] != unspecified ? layout.dimension[1] : 1,
        layout.stride[1],
        layout.dimension[2] != unspecified ? layout.dimension[2] : 1,
        layout.stride[2],
        layout.dimension[3] != unspecified ? layout.dimension[3] : 1,
        layout.stride[3],
        layout.dimension[4] != unspecified ? layout.dimension[4] : 1,
        layout.stride[4],
        layout.dimension[5] != unspecified ? layout.dimension[5] : 1,
        layout.stride[5],
        layout.dimension[6] != unspecified ? layout.dimension[6] : 1,
        layout.stride[6],
        layout.dimension[7] != unspecified ? layout.dimension[7] : unspecified,
        layout.stride[7]);
  }

  // Extra overload to match that for specialize types
  template <typename Traits, typename... P>
  KOKKOS_INLINE_FUNCTION static std::enable_if_t<
      (std::is_same_v<typename Traits::array_layout, Kokkos::LayoutRight> ||
       std::is_same_v<typename Traits::array_layout, Kokkos::LayoutLeft> ||
       std::is_same_v<typename Traits::array_layout, Kokkos::LayoutStride>),
      typename Traits::array_layout>
  createLayout([[maybe_unused]] const Kokkos::Impl::ViewCtorProp<P...>& prop,
               typename Traits::array_layout layout) {
// FIXME_SACADO this is only needed for special extra int treatment
#ifndef KOKKOS_ENABLE_IMPL_VIEW_LEGACY
    if constexpr (Traits::impl_is_customized &&
                  !Kokkos::Impl::ViewCtorProp<P...>::has_accessor_arg) {
      auto rank              = computeRank(prop, layout) - 1;
      layout.dimension[rank] = unspecified;
    }
#endif
    return createLayout(layout);
  }

  // Create a view from the given dimension arguments.
  // This is only necessary because the shmem constructor doesn't take a layout.
  //   NDE shmem View's are not compatible with the added view_alloc value_type
  //   / fad_dim deduction functionality
  template <typename ViewType, typename ViewArg>
  static ViewType createView(const ViewArg& arg, const size_t N0,
                             const size_t N1, const size_t N2, const size_t N3,
                             const size_t N4, const size_t N5, const size_t N6,
                             const size_t N7) {
    return ViewType(arg, N0 != unspecified ? N0 : 1, N1 != unspecified ? N1 : 1,
                    N2 != unspecified ? N2 : 1, N3 != unspecified ? N3 : 1,
                    N4 != unspecified ? N4 : 1, N5 != unspecified ? N5 : 1,
                    N6 != unspecified ? N6 : 1, N7 != unspecified ? N7 : 1);
  }
};

// Non-strided Layout
template <typename Layout, typename iType>
KOKKOS_INLINE_FUNCTION std::enable_if_t<
    (std::is_same_v<Layout, Kokkos::LayoutRight> ||
     std::is_same_v<Layout, Kokkos::LayoutLeft>)&&std::is_integral_v<iType>,
    Layout>
reconstructLayout(const Layout& layout, iType dynrank) {
  return Layout(dynrank > 0 ? layout.dimension[0] : KOKKOS_INVALID_INDEX,
                dynrank > 1 ? layout.dimension[1] : KOKKOS_INVALID_INDEX,
                dynrank > 2 ? layout.dimension[2] : KOKKOS_INVALID_INDEX,
                dynrank > 3 ? layout.dimension[3] : KOKKOS_INVALID_INDEX,
                dynrank > 4 ? layout.dimension[4] : KOKKOS_INVALID_INDEX,
                dynrank > 5 ? layout.dimension[5] : KOKKOS_INVALID_INDEX,
                dynrank > 6 ? layout.dimension[6] : KOKKOS_INVALID_INDEX,
                dynrank > 7 ? layout.dimension[7] : KOKKOS_INVALID_INDEX);
}

// LayoutStride
template <typename Layout, typename iType>
KOKKOS_INLINE_FUNCTION std::enable_if_t<
    (std::is_same_v<Layout, Kokkos::LayoutStride>)&&std::is_integral_v<iType>,
    Layout>
reconstructLayout(const Layout& layout, iType dynrank) {
  return Layout(dynrank > 0 ? layout.dimension[0] : KOKKOS_INVALID_INDEX,
                dynrank > 0 ? layout.stride[0] : (0),
                dynrank > 1 ? layout.dimension[1] : KOKKOS_INVALID_INDEX,
                dynrank > 1 ? layout.stride[1] : (0),
                dynrank > 2 ? layout.dimension[2] : KOKKOS_INVALID_INDEX,
                dynrank > 2 ? layout.stride[2] : (0),
                dynrank > 3 ? layout.dimension[3] : KOKKOS_INVALID_INDEX,
                dynrank > 3 ? layout.stride[3] : (0),
                dynrank > 4 ? layout.dimension[4] : KOKKOS_INVALID_INDEX,
                dynrank > 4 ? layout.stride[4] : (0),
                dynrank > 5 ? layout.dimension[5] : KOKKOS_INVALID_INDEX,
                dynrank > 5 ? layout.stride[5] : (0),
                dynrank > 6 ? layout.dimension[6] : KOKKOS_INVALID_INDEX,
                dynrank > 6 ? layout.stride[6] : (0),
                dynrank > 7 ? layout.dimension[7] : KOKKOS_INVALID_INDEX,
                dynrank > 7 ? layout.stride[7] : (0));
}

/** \brief  Debug bounds-checking routines */
// Enhanced debug checking - most infrastructure matches that of functions in
// Kokkos_ViewMapping; additional checks for extra arguments beyond rank are 0
template <unsigned, typename iType0, class MapType>
KOKKOS_INLINE_FUNCTION bool dyn_rank_view_verify_operator_bounds(
    const iType0&, const MapType&) {
  return true;
}

template <unsigned R, typename iType0, class MapType, typename iType1,
          class... Args>
KOKKOS_INLINE_FUNCTION bool dyn_rank_view_verify_operator_bounds(
    const iType0& rank, const MapType& map, const iType1& i, Args... args) {
  if (static_cast<iType0>(R) < rank) {
    return (size_t(i) < map.extent(R)) &&
           dyn_rank_view_verify_operator_bounds<R + 1>(rank, map, args...);
  } else if (i != 0) {
    Kokkos::printf(
        "DynRankView Debug Bounds Checking Error: at rank %u\n  Extra "
        "arguments beyond the rank must be zero \n",
        R);
    return (false) &&
           dyn_rank_view_verify_operator_bounds<R + 1>(rank, map, args...);
  } else {
    return (true) &&
           dyn_rank_view_verify_operator_bounds<R + 1>(rank, map, args...);
  }
}

template <unsigned, class MapType>
inline void dyn_rank_view_error_operator_bounds(char*, int, const MapType&) {}

template <unsigned R, class MapType, class iType, class... Args>
inline void dyn_rank_view_error_operator_bounds(char* buf, int len,
                                                const MapType& map,
                                                const iType& i, Args... args) {
  const int n = snprintf(
      buf, len, " %ld < %ld %c", static_cast<unsigned long>(i),
      static_cast<unsigned long>(map.extent(R)), (sizeof...(Args) ? ',' : ')'));
  dyn_rank_view_error_operator_bounds<R + 1>(buf + n, len - n, map, args...);
}

// op_rank = rank of the operator version that was called
template <typename MemorySpace, typename iType0, typename iType1, class MapType,
          class... Args>
KOKKOS_INLINE_FUNCTION void dyn_rank_view_verify_operator_bounds(
    const iType0& op_rank, const iType1& rank,
    const Kokkos::Impl::SharedAllocationTracker& tracker, const MapType& map,
    Args... args) {
  if (static_cast<iType0>(rank) > op_rank) {
    Kokkos::abort(
        "DynRankView Bounds Checking Error: Need at least rank arguments to "
        "the operator()");
  }

  if (!dyn_rank_view_verify_operator_bounds<0>(rank, map, args...)) {
    KOKKOS_IF_ON_HOST(
        (enum {LEN = 1024}; char buffer[LEN];
         const std::string label = tracker.template get_label<MemorySpace>();
         int n = snprintf(buffer, LEN, "DynRankView bounds error of view %s (",
                          label.c_str());
         dyn_rank_view_error_operator_bounds<0>(buffer + n, LEN - n, map,
                                                args...);
         Kokkos::Impl::throw_runtime_exception(std::string(buffer));))

    KOKKOS_IF_ON_DEVICE(
        ((void)tracker; Kokkos::abort("DynRankView bounds error");))
  }
}

/** \brief  Assign compatible default mappings */
struct ViewToDynRankViewTag {};

}  // namespace Impl

namespace Impl {

template <class DstTraits, class SrcTraits>
class ViewMapping<
    DstTraits, SrcTraits,
    std::enable_if_t<
        (std::is_same_v<typename DstTraits::memory_space,
                        typename SrcTraits::memory_space> &&
         std::is_void_v<typename DstTraits::specialize> &&
         std::is_void_v<typename SrcTraits::specialize> &&
         (std::is_same_v<typename DstTraits::array_layout,
                         typename SrcTraits::array_layout> ||
          ((std::is_same_v<typename DstTraits::array_layout,
                           Kokkos::LayoutLeft> ||
            std::is_same_v<typename DstTraits::array_layout,
                           Kokkos::LayoutRight> ||
            std::is_same_v<
                typename DstTraits::array_layout,
                Kokkos::LayoutStride>)&&(std::is_same_v<typename SrcTraits::
                                                            array_layout,
                                                        Kokkos::LayoutLeft> ||
                                         std::is_same_v<
                                             typename SrcTraits::array_layout,
                                             Kokkos::LayoutRight> ||
                                         std::is_same_v<
                                             typename SrcTraits::array_layout,
                                             Kokkos::LayoutStride>)))),
        Kokkos::Impl::ViewToDynRankViewTag>> {
 private:
  enum {
    is_assignable_value_type =
        std::is_same_v<typename DstTraits::value_type,
                       typename SrcTraits::value_type> ||
        std::is_same_v<typename DstTraits::value_type,
                       typename SrcTraits::const_value_type>
  };

  enum {
    is_assignable_layout =
        std::is_same_v<typename DstTraits::array_layout,
                       typename SrcTraits::array_layout> ||
        std::is_same_v<typename DstTraits::array_layout, Kokkos::LayoutStride>
  };

 public:
  enum { is_assignable = is_assignable_value_type && is_assignable_layout };

  using DstType = ViewMapping<DstTraits, typename DstTraits::specialize>;
  using SrcType = ViewMapping<SrcTraits, typename SrcTraits::specialize>;

  template <typename DT, typename... DP, typename ST, typename... SP>
  KOKKOS_INLINE_FUNCTION static void assign(
      Kokkos::DynRankView<DT, DP...>& dst, const Kokkos::View<ST, SP...>& src) {
    static_assert(
        is_assignable_value_type,
        "View assignment must have same value type or const = non-const");

    static_assert(
        is_assignable_layout,
        "View assignment must have compatible layout or have rank <= 1");

    // Removed dimension checks...

    using dst_offset_type   = typename DstType::offset_type;
    dst.m_map.m_impl_offset = dst_offset_type(
        std::integral_constant<unsigned, 0>(),
        src.layout());  // Check this for integer input1 for padding, etc
    dst.m_map.m_impl_handle = Kokkos::Impl::ViewDataHandle<DstTraits>::assign(
        src.m_map.m_impl_handle, src.m_track.m_tracker);
    dst.m_track.m_tracker.assign(src.m_track.m_tracker,
                                 !DstTraits::memory_traits::is_unmanaged);
    dst.m_rank = Kokkos::View<ST, SP...>::rank();
  }
};

}  // namespace Impl

/* \class DynRankView
 * \brief Container that creates a Kokkos view with rank determined at runtime.
 *   Essentially this is a rank 7 view
 *
 *   Changes from View
 *   1. The rank of the DynRankView is returned by the method rank()
 *   2. Max rank of a DynRankView is 7
 *   3. subview called with 'subview(...)' or 'subdynrankview(...)' (backward
 * compatibility)
 *   4. Every subview is returned with LayoutStride
 *   5. Copy and Copy-Assign View to DynRankView
 *   6. deep_copy between Views and DynRankViews
 *   7. rank( view ); returns the rank of View or DynRankView
 *
 */

template <class>
struct is_dyn_rank_view : public std::false_type {};

template <class D, class... P>
struct is_dyn_rank_view<Kokkos::DynRankView<D, P...>> : public std::true_type {
};

template <class T>
inline constexpr bool is_dyn_rank_view_v = is_dyn_rank_view<T>::value;

// Inherit privately from View, this way we don't import anything funky
// for example the rank member vs the rank() function of DynRankView
template <typename DataType, class... Properties>
class DynRankView : private View<DataType*******, Properties...> {
  static_assert(!std::is_array_v<DataType> && !std::is_pointer_v<DataType>,
                "Cannot template DynRankView with array or pointer datatype - "
                "must be pod");

 private:
  template <class, class...>
  friend class DynRankView;
  template <class, class...>
  friend class Kokkos::Impl::ViewMapping;

  size_t m_rank{};

 public:
  using drvtraits = ViewTraits<DataType, Properties...>;

  using view_type = View<DataType*******, Properties...>;

 private:
#ifdef KOKKOS_ENABLE_IMPL_VIEW_LEGACY
  using drdtraits = Impl::DynRankDimTraits<typename view_type::specialize>;
#else
  using drdtraits = Impl::DynRankDimTraits<
      std::conditional_t<view_type::traits::impl_is_customized, bool, void>>;
#endif
 public:
  // typedefs from ViewTraits, overriden
  using data_type           = typename drvtraits::data_type;
  using const_data_type     = typename drvtraits::const_data_type;
  using non_const_data_type = typename drvtraits::non_const_data_type;

  // typedefs from ViewTraits not overriden
  using value_type           = typename view_type::value_type;
  using const_value_type     = typename view_type::const_value_type;
  using non_const_value_type = typename view_type::non_const_value_type;
  using traits               = typename view_type::traits;
  using array_layout         = typename view_type::array_layout;

  using execution_space = typename view_type::execution_space;
  using memory_space    = typename view_type::memory_space;
  using device_type     = typename view_type::device_type;

  using memory_traits     = typename view_type::memory_traits;
  using host_mirror_space = typename view_type::host_mirror_space;
  using size_type         = typename view_type::size_type;

  using reference_type = typename view_type::reference_type;
  using pointer_type   = typename view_type::pointer_type;

#ifdef KOKKOS_ENABLE_DEPRECATED_CODE_5
  using scalar_array_type KOKKOS_DEPRECATED_WITH_COMMENT(
      "Use data_type instead.") = data_type;
  using const_scalar_array_type KOKKOS_DEPRECATED_WITH_COMMENT(
      "Use const_data_type instead.") = const_data_type;
  using non_const_scalar_array_type KOKKOS_DEPRECATED_WITH_COMMENT(
      "Use non_const_data_type instead.") = non_const_data_type;
#endif
#ifndef KOKKOS_ENABLE_IMPL_VIEW_LEGACY
#ifdef KOKKOS_ENABLE_DEPRECATED_CODE_4
  using specialize KOKKOS_DEPRECATED = void;
#endif
#else
  using specialize = typename view_type::specialize;
#endif

  // typedefs in View for mdspan compatibility
  // cause issues with MSVC+CUDA
  // using layout_type  = typename view_type::layout_type;
  using index_type       = typename view_type::index_type;
  using element_type     = typename view_type::element_type;
  using rank_type        = typename view_type::rank_type;
  using reference        = reference_type;
  using data_handle_type = pointer_type;

#ifndef KOKKOS_ENABLE_IMPL_VIEW_LEGACY
  using accessor_type = typename view_type::accessor_type;
  using mapping_type  = typename view_type::mapping_type;
#endif

  KOKKOS_FUNCTION
  view_type& DownCast() const { return (view_type&)(*this); }

  // FIXME: this function make NO sense, the above one already is marked const
  // Maybe one would want to get back a view of const??
  KOKKOS_FUNCTION
  const view_type& ConstDownCast() const { return (const view_type&)(*this); }

  // FIXME: deprecate DownCast in favor of to_view
  // KOKKOS_FUNCTION
  // view_type to_view() const { return *this; }

  // Types below - at least host_mirror_type requires the value_type, NOT the
  // rank 7 data_type of the traits

  /** \brief  Compatible view of array of scalar types */
  using type = DynRankView<
      typename drvtraits::data_type, typename drvtraits::array_layout,
      typename drvtraits::device_type, typename drvtraits::memory_traits>;

#ifdef KOKKOS_ENABLE_DEPRECATED_CODE_5
  /** \brief  Compatible view of array of scalar types */
  using array_type KOKKOS_DEPRECATED_WITH_COMMENT("Use type instead.") = type;
#endif

  /** \brief  Compatible view of const data type */
  using const_type = DynRankView<
      typename drvtraits::const_data_type, typename drvtraits::array_layout,
      typename drvtraits::device_type, typename drvtraits::memory_traits>;

  /** \brief  Compatible view of non-const data type */
  using non_const_type = DynRankView<
      typename drvtraits::non_const_data_type, typename drvtraits::array_layout,
      typename drvtraits::device_type, typename drvtraits::memory_traits>;

  /** \brief  Compatible host mirror view */
  using host_mirror_type = DynRankView<typename drvtraits::non_const_data_type,
                                       typename drvtraits::array_layout,
                                       typename drvtraits::host_mirror_space>;

#ifdef KOKKOS_ENABLE_DEPRECATED_CODE_4
  /** \brief  Compatible HostMirror view */
  using HostMirror KOKKOS_DEPRECATED_WITH_COMMENT(
      "Use host_mirror_type instead.") = host_mirror_type;
#endif
  //----------------------------------------
  // Domain rank and extents

  //  enum { Rank = map_type::Rank }; //Will be dyn rank of 7 always, keep the
  //  enum?

  //----------------------------------------
  /*  Deprecate all 'dimension' functions in favor of
   *  ISO/C++ vocabulary 'extent'.
   */

  //----------------------------------------

 private:
  enum {
    is_layout_left =
        std::is_same_v<typename traits::array_layout, Kokkos::LayoutLeft>,

    is_layout_right =
        std::is_same_v<typename traits::array_layout, Kokkos::LayoutRight>,

    is_layout_stride =
        std::is_same_v<typename traits::array_layout, Kokkos::LayoutStride>,

    is_default_map = std::is_void_v<typename traits::specialize> &&
                     (is_layout_left || is_layout_right || is_layout_stride),

    is_default_access =
        is_default_map && std::is_same_v<reference_type, element_type&>
  };

// Bounds checking macros
#if defined(KOKKOS_ENABLE_DEBUG_BOUNDS_CHECK)

// rank of the calling operator - included as first argument in ARG
#define KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(ARG)                             \
  Kokkos::Impl::runtime_check_memory_access_violation<                    \
      typename traits::memory_space>(                                     \
      "Kokkos::DynRankView ERROR: attempt to access inaccessible memory " \
      "space");                                                           \
  Kokkos::Impl::dyn_rank_view_verify_operator_bounds<                     \
      typename traits::memory_space>                                      \
      ARG;

#else

#define KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(ARG)                             \
  Kokkos::Impl::runtime_check_memory_access_violation<                    \
      typename traits::memory_space>(                                     \
      "Kokkos::DynRankView ERROR: attempt to access inaccessible memory " \
      "space");

#endif

 public:
  KOKKOS_FUNCTION
  constexpr unsigned rank() const { return m_rank; }

#ifndef KOKKOS_ENABLE_IMPL_VIEW_LEGACY
  using view_type::accessor;  // FIXME: not tested
  using view_type::mapping;   // FIXME: not tested
#endif
  using view_type::data;
  using view_type::extent;
  using view_type::extent_int;  // FIXME: not tested
  using view_type::impl_map;    // FIXME: not tested
  using view_type::is_allocated;
  using view_type::label;
  using view_type::size;
  using view_type::span;
  using view_type::span_is_contiguous;  // FIXME: not tested
  using view_type::stride;              // FIXME: not tested
#ifdef KOKKOS_ENABLE_DEPRECATED_CODE_4
  using view_type::stride_0;  // FIXME: not tested
  using view_type::stride_1;  // FIXME: not tested
  using view_type::stride_2;  // FIXME: not tested
  using view_type::stride_3;  // FIXME: not tested
  using view_type::stride_4;  // FIXME: not tested
  using view_type::stride_5;  // FIXME: not tested
  using view_type::stride_6;  // FIXME: not tested
  using view_type::stride_7;  // FIXME: not tested
#endif
  using view_type::use_count;

#ifdef KOKKOS_ENABLE_CUDA
  KOKKOS_FUNCTION reference_type
  operator()(index_type i0 = 0, index_type i1 = 0, index_type i2 = 0,
             index_type i3 = 0, index_type i4 = 0, index_type i5 = 0,
             index_type i6 = 0) const {
    return view_type::operator()(i0, i1, i2, i3, i4, i5, i6);
  }
#else
  // Adding shortcut operators for rank-0 to rank-3 for default layouts
  // and access modalities.
  // This removes performance overhead for always using rank-7 mapping.
  // See https://github.com/kokkos/kokkos/issues/7604
  // When boundschecking is enabled we still go through the underlying
  // rank-7 View to leverage the error checks there.

  KOKKOS_FUNCTION reference_type operator()() const {
#ifdef KOKKOS_ENABLE_DEBUG
    if (rank() != 0u)
      Kokkos::abort(
          "DynRankView rank 0 operator() called with invalid number of "
          "arguments.");
#endif
#ifndef KOKKOS_ENABLE_DEBUG_BOUNDS_CHECK
    if constexpr (is_default_access) {
      return view_type::data()[0];
    } else
#endif
    {
      return view_type::operator()(0, 0, 0, 0, 0, 0, 0);
    }
  }

  KOKKOS_FUNCTION reference_type operator()(index_type i0) const {
#ifdef KOKKOS_ENABLE_DEBUG
    // FIXME: Should be equal, only access(...) allows mismatch of rank and
    // index args
    if (rank() > 1u)
      Kokkos::abort(
          "DynRankView rank 1 operator() called with invalid number of "
          "arguments.");
#endif
#ifndef KOKKOS_ENABLE_DEBUG_BOUNDS_CHECK
    if constexpr (is_default_access) {
      if constexpr (is_layout_stride) {
        return view_type::data()[i0 * view_type::stride(0)];
      } else {
        return view_type::data()[i0];
      }
    } else
#endif
    {
      return view_type::operator()(i0, 0, 0, 0, 0, 0, 0);
    }
  }

  KOKKOS_FUNCTION reference_type operator()(index_type i0,
                                            index_type i1) const {
#ifdef KOKKOS_ENABLE_DEBUG
    // FIXME: Should be equal, only access(...) allows mismatch of rank and
    // index args
    if (rank() > 2u)
      Kokkos::abort(
          "DynRankView rank 2 operator() called with invalid number of "
          "arguments.");
#endif
#ifndef KOKKOS_ENABLE_DEBUG_BOUNDS_CHECK
    if constexpr (is_default_access) {
      if constexpr (is_layout_left) {
        return view_type::data()[i0 + i1 * view_type::stride(1)];
      } else if constexpr (is_layout_right) {
        return view_type::data()[i0 * view_type::extent(1) + i1];
      } else {
        return view_type::data()[i0 * view_type::stride(0) +
                                 i1 * view_type::stride(1)];
      }
    } else
#endif
    {
      return view_type::operator()(i0, i1, 0, 0, 0, 0, 0);
    }
  }

  KOKKOS_FUNCTION reference_type operator()(index_type i0, index_type i1,
                                            index_type i2) const {
#ifdef KOKKOS_ENABLE_DEBUG
    // FIXME: Should be equal, only access(...) allows mismatch of rank and
    // index args
    if (rank() > 3u)
      Kokkos::abort(
          "DynRankView rank 3 operator() called with invalid number of "
          "arguments.");
#endif
#ifndef KOKKOS_ENABLE_DEBUG_BOUNDS_CHECK
    if constexpr (is_default_access) {
      if constexpr (is_layout_left) {
        return view_type::data()[i0 + view_type::stride(1) *
                                          (i1 + i2 * view_type::extent(1))];
      } else if constexpr (is_layout_right) {
        return view_type::data()[(i0 * view_type::extent(1) + i1) *
                                     view_type::extent(2) +
                                 i2];
      } else {
        return view_type::data()[i0 * view_type::stride(0) +
                                 i1 * view_type::stride(1) +
                                 i2 * view_type::stride(2)];
      }
    } else
#endif
    {
      return view_type::operator()(i0, i1, i2, 0, 0, 0, 0);
    }
  }

  KOKKOS_FUNCTION reference_type operator()(index_type i0, index_type i1,
                                            index_type i2, index_type i3,
                                            index_type i4 = 0,
                                            index_type i5 = 0,
                                            index_type i6 = 0) const {
    return view_type::operator()(i0, i1, i2, i3, i4, i5, i6);
  }
#endif

// This is an accomodation for Phalanx, that is usint the operator[] to access
// all elements in a linear fashion even when the rank is not 1
#ifdef KOKKOS_ENABLE_DEPRECATED_CODE_4
  KOKKOS_FUNCTION reference_type operator[](index_type i0) const {
    if constexpr (std::is_same_v<typename drvtraits::value_type,
                                 typename drvtraits::data_type>) {
      return view_type::data()[i0];
    } else {
      const size_t dim_scalar = view_type::impl_map().dimension_scalar();
      const size_t bytes      = view_type::span() / dim_scalar;

      using tmp_view_type =
          Kokkos::View<DataType*, typename traits::array_layout,
                       typename traits::device_type,
                       Kokkos::MemoryTraits<traits::memory_traits::impl_value |
                                            unsigned(Kokkos::Unmanaged)>>;
      tmp_view_type rankone_view(view_type::data(), bytes, dim_scalar);
      return rankone_view(i0);
    }
  }
#else
  KOKKOS_FUNCTION reference_type operator[](index_type i0) const {
#ifdef KOKKOS_ENABLE_DEBUG
    if (rank() != 1u)
      Kokkos::abort("DynRankView operator[] can only be used for rank-1");
#endif
    return view_type::operator()(i0, 0, 0, 0, 0, 0, 0);
  }
#endif

  KOKKOS_FUNCTION reference_type access(index_type i0 = 0, index_type i1 = 0,
                                        index_type i2 = 0, index_type i3 = 0,
                                        index_type i4 = 0, index_type i5 = 0,
                                        index_type i6 = 0) const {
    return view_type::operator()(i0, i1, i2, i3, i4, i5, i6);
  }

  //----------------------------------------
  // Standard constructor, destructor, and assignment operators...

  KOKKOS_DEFAULTED_FUNCTION
  ~DynRankView() = default;

  KOKKOS_DEFAULTED_FUNCTION DynRankView() = default;

  //----------------------------------------
  // Compatible view copy constructor and assignment
  // may assign unmanaged from managed.
  // Make this conditionally explicit?
  template <class RT, class... RP>
  KOKKOS_FUNCTION DynRankView(const DynRankView<RT, RP...>& rhs)
      : view_type(rhs), m_rank(rhs.m_rank) {}

  KOKKOS_INLINE_FUNCTION DynRankView(view_type rhs, size_t new_rank)
      : view_type(rhs), m_rank(new_rank) {
    if (new_rank > view_type::rank())
      Kokkos::abort(
          "Attempting to construct DynRankView from View and new rank, with "
          "the new rank being too large.");

    bool invalid_extent = false;
    for (size_t r = new_rank; r < view_type::rank(); r++)
      if (rhs.extent(r) != 1) invalid_extent = true;
    if (invalid_extent)
      Kokkos::abort(
          "Attempting to construct DynRankView from View with incompatible "
          "extents. (Extents for dimensions larger than the provided rank are "
          "not equal to 1).");
  }

  template <class RT, class... RP>
  KOKKOS_FUNCTION DynRankView& operator=(const DynRankView<RT, RP...>& rhs) {
    view_type::operator=(rhs);
    m_rank = rhs.m_rank;
    return *this;
  }

#ifndef KOKKOS_ENABLE_IMPL_VIEW_LEGACY
 private:
  template <class Ext>
  KOKKOS_FUNCTION typename view_type::extents_type create_rank7_extents(
      const Ext& ext) {
    return typename view_type::extents_type(
        ext.rank() > 0 ? ext.extent(0) : 1, ext.rank() > 1 ? ext.extent(1) : 1,
        ext.rank() > 2 ? ext.extent(2) : 1, ext.rank() > 3 ? ext.extent(3) : 1,
        ext.rank() > 4 ? ext.extent(4) : 1, ext.rank() > 5 ? ext.extent(5) : 1,
        ext.rank() > 6 ? ext.extent(6) : 1);
  }

 public:
  // Copy/Assign View to DynRankView
  template <class RT, class... RP>
  KOKKOS_INLINE_FUNCTION DynRankView(const View<RT, RP...>& rhs,
                                     size_t new_rank)
      : view_type(rhs.data_handle(),
                  Impl::mapping_from_array_layout<
                      typename view_type::mdspan_type::mapping_type>(
                      drdtraits::createLayout(rhs.layout(), new_rank)),
                  rhs.accessor()),
        m_rank(new_rank) {
    if (new_rank > View<RT, RP...>::rank())
      Kokkos::abort(
          "Attempting to construct DynRankView from View and new rank, with "
          "the new rank being too large.");
  }

  template <class RT, class... RP>
  KOKKOS_INLINE_FUNCTION DynRankView& operator=(const View<RT, RP...>& rhs) {
    view_type::operator=(
        view_type(rhs.data_handle(),
                  Impl::mapping_from_array_layout<
                      typename view_type::mdspan_type::mapping_type>(
                      drdtraits::createLayout(rhs.layout(), rhs.rank())),
                  rhs.accessor()));
    m_rank = rhs.rank();
    return *this;
  }
#else
  template <class RT, class... RP>
  KOKKOS_FUNCTION DynRankView(const View<RT, RP...>& rhs, size_t new_rank) {
    using SrcTraits = typename View<RT, RP...>::traits;
    using Mapping =
        Kokkos::Impl::ViewMapping<traits, SrcTraits,
                                  Kokkos::Impl::ViewToDynRankViewTag>;
    static_assert(Mapping::is_assignable,
                  "Incompatible View to DynRankView copy assignment");
    if (new_rank > View<RT, RP...>::rank())
      Kokkos::abort(
          "Attempting to construct DynRankView from View and new rank, with "
          "the new rank being too large.");
    Mapping::assign(*this, rhs);
    m_rank = new_rank;
  }

  template <class RT, class... RP>
  KOKKOS_FUNCTION DynRankView& operator=(const View<RT, RP...>& rhs) {
    using SrcTraits = typename View<RT, RP...>::traits;
    using Mapping =
        Kokkos::Impl::ViewMapping<traits, SrcTraits,
                                  Kokkos::Impl::ViewToDynRankViewTag>;
    static_assert(Mapping::is_assignable,
                  "Incompatible View to DynRankView copy assignment");
    Mapping::assign(*this, rhs);
    m_rank = View<RT, RP...>::rank();
    return *this;
  }
#endif

  template <class RT, class... RP>
  KOKKOS_FUNCTION DynRankView(const View<RT, RP...>& rhs)
      : DynRankView(rhs, View<RT, RP...>::rank()) {}

  //----------------------------------------
  // Allocation tracking properties

  //----------------------------------------
  // Allocation according to allocation properties and array layout
  // unused arg_layout dimensions must be set to KOKKOS_INVALID_INDEX so that
  // rank deduction can properly take place
  // We need two variants to avoid calling host function from host device
  // function warnings

#ifndef KOKKOS_ENABLE_IMPL_VIEW_LEGACY
 private:
  // Need a host only and a host/device function to deal with labels.
  template <class... P>
  KOKKOS_FUNCTION auto attach_accessor_arg_if_needed(
      const Impl::ViewCtorProp<P...>& arg_prop,
      std::enable_if_t<((!std::is_same_v<P, std::string>)&&...),
                       const typename traits::array_layout&>
          layout) {
    if constexpr (traits::impl_is_customized &&
                  !Impl::ViewCtorProp<P...>::has_accessor_arg) {
      int r = 0;
      while (r < 8 && layout.dimension[r] != KOKKOS_INVALID_INDEX) r++;

      // Can't use with_properties_if_unset since its a host only function!
      return view_wrap(
          static_cast<const Impl::ViewCtorProp<void, P>&>(arg_prop).value...,
          Impl::AccessorArg_t{r > 0 ? size_t(layout.dimension[r - 1]) : 0ul});
    } else {
      return arg_prop;
    }
  }
  template <class... P>
  auto attach_accessor_arg_if_needed(
      const Impl::ViewCtorProp<P...>& arg_prop,
      std::enable_if_t<(std::is_same_v<P, std::string> || ...),
                       const typename traits::array_layout&>
          layout) {
    if constexpr (traits::impl_is_customized &&
                  !Impl::ViewCtorProp<P...>::has_accessor_arg) {
      int r = 0;
      while (r < 8 && layout.dimension[r] != KOKKOS_INVALID_INDEX) r++;
      // Could use with_properties_if_unset, but rather keep same as above.
      return view_alloc(
          static_cast<const Impl::ViewCtorProp<void, P>&>(arg_prop).value...,
          Impl::AccessorArg_t{r > 0 ? size_t(layout.dimension[r - 1]) : 0ul});
    } else {
      return arg_prop;
    }
  }

 public:
#endif

  template <class... P>
  explicit KOKKOS_FUNCTION DynRankView(
      const Kokkos::Impl::ViewCtorProp<P...>& arg_prop,
      std::enable_if_t<Kokkos::Impl::ViewCtorProp<P...>::has_pointer,
                       typename traits::array_layout const&>
          arg_layout)
#ifndef KOKKOS_ENABLE_IMPL_VIEW_LEGACY
      : view_type(attach_accessor_arg_if_needed(arg_prop, arg_layout),
                  drdtraits::template createLayout<traits, P...>(arg_prop,
                                                                 arg_layout)),
        m_rank(drdtraits::computeRank(arg_prop, arg_layout) -
               (traits::impl_is_customized ? 1 : 0)){}
#else
      : view_type(arg_prop, drdtraits::template createLayout<traits, P...>(
                                arg_prop, arg_layout)),
        m_rank(drdtraits::computeRank(arg_prop, arg_layout)) {
  }
#endif

        template <class... P>
        explicit DynRankView(
            const Kokkos::Impl::ViewCtorProp<P...>& arg_prop,
            std::enable_if_t<!Kokkos::Impl::ViewCtorProp<P...>::has_pointer,
                             typename traits::array_layout const&>
                arg_layout)
#ifndef KOKKOS_ENABLE_IMPL_VIEW_LEGACY
      : view_type(attach_accessor_arg_if_needed(arg_prop, arg_layout),
                  drdtraits::template createLayout<traits, P...>(arg_prop,
                                                                 arg_layout)),
        m_rank(drdtraits::computeRank(arg_prop, arg_layout) -
               (traits::impl_is_customized &&
                        !Kokkos::Impl::ViewCtorProp<P...>::has_accessor_arg
                    ? 1
                    : 0)){}
#else
      : view_type(arg_prop, drdtraits::template createLayout<traits, P...>(
                                arg_prop, arg_layout)),
        m_rank(drdtraits::computeRank(arg_prop, arg_layout)) {
  }
#endif

        //----------------------------------------
        // Constructor(s)

        // Simple dimension-only layout
        // We need two variants to avoid calling host function from host device
        // function warnings
        template <class... P>
        explicit KOKKOS_FUNCTION DynRankView(
            const Kokkos::Impl::ViewCtorProp<P...>& arg_prop,
            std::enable_if_t<Kokkos::Impl::ViewCtorProp<P...>::has_pointer,
                             const size_t>
                arg_N0          = KOKKOS_INVALID_INDEX,
            const size_t arg_N1 = KOKKOS_INVALID_INDEX,
            const size_t arg_N2 = KOKKOS_INVALID_INDEX,
            const size_t arg_N3 = KOKKOS_INVALID_INDEX,
            const size_t arg_N4 = KOKKOS_INVALID_INDEX,
            const size_t arg_N5 = KOKKOS_INVALID_INDEX,
            const size_t arg_N6 = KOKKOS_INVALID_INDEX,
            const size_t arg_N7 = KOKKOS_INVALID_INDEX)
      : DynRankView(arg_prop, typename traits::array_layout(
                                  arg_N0, arg_N1, arg_N2, arg_N3, arg_N4,
                                  arg_N5, arg_N6, arg_N7)) {
  }

  template <class... P>
  explicit DynRankView(
      const Kokkos::Impl::ViewCtorProp<P...>& arg_prop,
      std::enable_if_t<!Kokkos::Impl::ViewCtorProp<P...>::has_pointer,
                       const size_t>
          arg_N0          = KOKKOS_INVALID_INDEX,
      const size_t arg_N1 = KOKKOS_INVALID_INDEX,
      const size_t arg_N2 = KOKKOS_INVALID_INDEX,
      const size_t arg_N3 = KOKKOS_INVALID_INDEX,
      const size_t arg_N4 = KOKKOS_INVALID_INDEX,
      const size_t arg_N5 = KOKKOS_INVALID_INDEX,
      const size_t arg_N6 = KOKKOS_INVALID_INDEX,
      const size_t arg_N7 = KOKKOS_INVALID_INDEX)
      : DynRankView(arg_prop, typename traits::array_layout(
                                  arg_N0, arg_N1, arg_N2, arg_N3, arg_N4,
                                  arg_N5, arg_N6, arg_N7)) {}

  // Allocate with label and layout
  template <typename Label>
  explicit inline DynRankView(
      const Label& arg_label,
      std::enable_if_t<Kokkos::Impl::is_view_label<Label>::value,
                       typename traits::array_layout> const& arg_layout)
      : DynRankView(Kokkos::Impl::ViewCtorProp<std::string>(arg_label),
                    arg_layout) {}

  // Allocate label and layout, must disambiguate from subview constructor
  template <typename Label>
  explicit inline DynRankView(
      const Label& arg_label,
      std::enable_if_t<Kokkos::Impl::is_view_label<Label>::value, const size_t>
          arg_N0          = KOKKOS_INVALID_INDEX,
      const size_t arg_N1 = KOKKOS_INVALID_INDEX,
      const size_t arg_N2 = KOKKOS_INVALID_INDEX,
      const size_t arg_N3 = KOKKOS_INVALID_INDEX,
      const size_t arg_N4 = KOKKOS_INVALID_INDEX,
      const size_t arg_N5 = KOKKOS_INVALID_INDEX,
      const size_t arg_N6 = KOKKOS_INVALID_INDEX,
      const size_t arg_N7 = KOKKOS_INVALID_INDEX)
      : DynRankView(
            Kokkos::Impl::ViewCtorProp<std::string>(arg_label),
            typename traits::array_layout(arg_N0, arg_N1, arg_N2, arg_N3,
                                          arg_N4, arg_N5, arg_N6, arg_N7)) {}

  //----------------------------------------
  // Memory span required to wrap these dimensions.
  // FIXME: this function needs to be tested
  static constexpr size_t required_allocation_size(
      const size_t arg_N0 = 1, const size_t arg_N1 = 1, const size_t arg_N2 = 1,
      const size_t arg_N3 = 1, const size_t arg_N4 = 1, const size_t arg_N5 = 1,
      const size_t arg_N6                  = 1,
      [[maybe_unused]] const size_t arg_N7 = KOKKOS_INVALID_INDEX) {
    // FIXME: check that arg_N7 is not set by user (in debug mode)
    return view_type::required_allocation_size(arg_N0, arg_N1, arg_N2, arg_N3,
                                               arg_N4, arg_N5, arg_N6);
  }

  explicit KOKKOS_FUNCTION DynRankView(
      typename view_type::pointer_type arg_ptr,
      const size_t arg_N0 = KOKKOS_INVALID_INDEX,
      const size_t arg_N1 = KOKKOS_INVALID_INDEX,
      const size_t arg_N2 = KOKKOS_INVALID_INDEX,
      const size_t arg_N3 = KOKKOS_INVALID_INDEX,
      const size_t arg_N4 = KOKKOS_INVALID_INDEX,
      const size_t arg_N5 = KOKKOS_INVALID_INDEX,
      const size_t arg_N6 = KOKKOS_INVALID_INDEX,
      const size_t arg_N7 = KOKKOS_INVALID_INDEX)
      : DynRankView(
            Kokkos::Impl::ViewCtorProp<typename view_type::pointer_type>(
                arg_ptr),
            arg_N0, arg_N1, arg_N2, arg_N3, arg_N4, arg_N5, arg_N6, arg_N7) {}

  explicit KOKKOS_FUNCTION DynRankView(
      typename view_type::pointer_type arg_ptr,
      typename traits::array_layout& arg_layout)
      : DynRankView(
            Kokkos::Impl::ViewCtorProp<typename view_type::pointer_type>(
                arg_ptr),
            arg_layout) {}

  //----------------------------------------
  // Shared scratch memory constructor

  // Note: We must pass 7 valid args since view_type is rank 7
  static inline size_t shmem_size(
      const size_t arg_N0 = 1, const size_t arg_N1 = 1, const size_t arg_N2 = 1,
      const size_t arg_N3 = 1, const size_t arg_N4 = 1, const size_t arg_N5 = 1,
      const size_t arg_N6 = 1, const size_t arg_N7 = KOKKOS_INVALID_INDEX) {
    return view_type::shmem_size(arg_N0, arg_N1, arg_N2, arg_N3, arg_N4, arg_N5,
                                 arg_N6, arg_N7);
  }

  explicit KOKKOS_FUNCTION DynRankView(
      const typename traits::execution_space::scratch_memory_space& arg_space,
      const typename traits::array_layout& arg_layout)
      : view_type(arg_space, drdtraits::createLayout(arg_layout)),
        m_rank(drdtraits::computeRank(arg_layout)) {}

  explicit KOKKOS_FUNCTION DynRankView(
      const typename traits::execution_space::scratch_memory_space& arg_space,
      const size_t arg_N0 = KOKKOS_INVALID_INDEX,
      const size_t arg_N1 = KOKKOS_INVALID_INDEX,
      const size_t arg_N2 = KOKKOS_INVALID_INDEX,
      const size_t arg_N3 = KOKKOS_INVALID_INDEX,
      const size_t arg_N4 = KOKKOS_INVALID_INDEX,
      const size_t arg_N5 = KOKKOS_INVALID_INDEX,
      const size_t arg_N6 = KOKKOS_INVALID_INDEX,
      const size_t arg_N7 = KOKKOS_INVALID_INDEX)

      : DynRankView(arg_space, typename traits::array_layout(
                                   arg_N0, arg_N1, arg_N2, arg_N3, arg_N4,
                                   arg_N5, arg_N6, arg_N7)) {}

  KOKKOS_FUNCTION constexpr auto layout() const {
    switch (rank()) {
      case 0: return Impl::as_view_of_rank_n<0>(*this).layout();
      case 1: return Impl::as_view_of_rank_n<1>(*this).layout();
      case 2: return Impl::as_view_of_rank_n<2>(*this).layout();
      case 3: return Impl::as_view_of_rank_n<3>(*this).layout();
      case 4: return Impl::as_view_of_rank_n<4>(*this).layout();
      case 5: return Impl::as_view_of_rank_n<5>(*this).layout();
      case 6: return Impl::as_view_of_rank_n<6>(*this).layout();
      case 7: return Impl::as_view_of_rank_n<7>(*this).layout();
      default:
        KOKKOS_IF_ON_HOST(
            Kokkos::abort(
                std::string(
                    "Calling DynRankView::layout on DRV of unexpected rank " +
                    std::to_string(rank()))
                    .c_str());)
        KOKKOS_IF_ON_DEVICE(
            Kokkos::abort(
                "Calling DynRankView::layout on DRV of unexpected rank");)
    }
    // control flow should never reach here
    return view_type::layout();
  }
};

template <typename D, class... P>
KOKKOS_FUNCTION constexpr unsigned rank(const DynRankView<D, P...>& DRV) {
  return DRV.rank();
}  // needed for transition to common constexpr method in view and dynrankview
   // to return rank

//----------------------------------------------------------------------------
// Subview mapping.
// Deduce destination view type from source view traits and subview arguments

namespace Impl {

struct DynRankSubviewTag {};

}  // namespace Impl

template <class V, class... Args>
using Subdynrankview =
    typename Kokkos::Impl::ViewMapping<Kokkos::Impl::DynRankSubviewTag, V,
                                       Args...>::ret_type;

template <class... DRVArgs, class SubArg0 = int, class SubArg1 = int,
          class SubArg2 = int, class SubArg3 = int, class SubArg4 = int,
          class SubArg5 = int, class SubArg6 = int>
KOKKOS_INLINE_FUNCTION auto subdynrankview(
    const DynRankView<DRVArgs...>& drv, SubArg0 arg0 = SubArg0{},
    SubArg1 arg1 = SubArg1{}, SubArg2 arg2 = SubArg2{},
    SubArg3 arg3 = SubArg3{}, SubArg4 arg4 = SubArg4{},
    SubArg5 arg5 = SubArg5{}, SubArg6 arg6 = SubArg6{}) {
  auto sub = subview(drv.DownCast(), arg0, arg1, arg2, arg3, arg4, arg5, arg6);
  using sub_t     = decltype(sub);
  size_t new_rank = (drv.rank() > 0 && !std::is_integral_v<SubArg0> ? 1 : 0) +
                    (drv.rank() > 1 && !std::is_integral_v<SubArg1> ? 1 : 0) +
                    (drv.rank() > 2 && !std::is_integral_v<SubArg2> ? 1 : 0) +
                    (drv.rank() > 3 && !std::is_integral_v<SubArg3> ? 1 : 0) +
                    (drv.rank() > 4 && !std::is_integral_v<SubArg4> ? 1 : 0) +
                    (drv.rank() > 5 && !std::is_integral_v<SubArg5> ? 1 : 0) +
                    (drv.rank() > 6 && !std::is_integral_v<SubArg6> ? 1 : 0);

  using return_type =
      DynRankView<typename sub_t::value_type, Kokkos::LayoutStride,
                  typename sub_t::device_type, typename sub_t::memory_traits>;
  return static_cast<return_type>(
      DynRankView<typename sub_t::value_type, typename sub_t::array_layout,
                  typename sub_t::device_type, typename sub_t::memory_traits>(
          sub, new_rank));
}
template <class... DRVArgs, class SubArg0 = int, class SubArg1 = int,
          class SubArg2 = int, class SubArg3 = int, class SubArg4 = int,
          class SubArg5 = int, class SubArg6 = int>
KOKKOS_INLINE_FUNCTION auto subview(
    const DynRankView<DRVArgs...>& drv, SubArg0 arg0 = SubArg0{},
    SubArg1 arg1 = SubArg1{}, SubArg2 arg2 = SubArg2{},
    SubArg3 arg3 = SubArg3{}, SubArg4 arg4 = SubArg4{},
    SubArg5 arg5 = SubArg5{}, SubArg6 arg6 = SubArg6{}) {
  return subdynrankview(drv, arg0, arg1, arg2, arg3, arg4, arg5, arg6);
}

}  // namespace Kokkos

namespace Kokkos {

// overload == and !=
template <class LT, class... LP, class RT, class... RP>
KOKKOS_INLINE_FUNCTION bool operator==(const DynRankView<LT, LP...>& lhs,
                                       const DynRankView<RT, RP...>& rhs) {
  // Same data, layout, dimensions
  using lhs_traits = ViewTraits<LT, LP...>;
  using rhs_traits = ViewTraits<RT, RP...>;

  return std::is_same_v<typename lhs_traits::const_value_type,
                        typename rhs_traits::const_value_type> &&
         std::is_same_v<typename lhs_traits::array_layout,
                        typename rhs_traits::array_layout> &&
         std::is_same_v<typename lhs_traits::memory_space,
                        typename rhs_traits::memory_space> &&
         lhs.rank() == rhs.rank() && lhs.data() == rhs.data() &&
         lhs.span() == rhs.span() && lhs.extent(0) == rhs.extent(0) &&
         lhs.extent(1) == rhs.extent(1) && lhs.extent(2) == rhs.extent(2) &&
         lhs.extent(3) == rhs.extent(3) && lhs.extent(4) == rhs.extent(4) &&
         lhs.extent(5) == rhs.extent(5) && lhs.extent(6) == rhs.extent(6) &&
         lhs.extent(7) == rhs.extent(7);
}

template <class LT, class... LP, class RT, class... RP>
KOKKOS_INLINE_FUNCTION bool operator!=(const DynRankView<LT, LP...>& lhs,
                                       const DynRankView<RT, RP...>& rhs) {
  return !(operator==(lhs, rhs));
}

}  // namespace Kokkos

//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
namespace Kokkos {
namespace Impl {

template <class OutputView, class InputView,
          class ExecSpace = typename OutputView::execution_space>
struct DynRankViewRemap {
  const OutputView output;
  const InputView input;
  const size_t n0;
  const size_t n1;
  const size_t n2;
  const size_t n3;
  const size_t n4;
  const size_t n5;
  const size_t n6;
  const size_t n7;

  DynRankViewRemap(const ExecSpace& exec_space, const OutputView& arg_out,
                   const InputView& arg_in)
      : output(arg_out),
        input(arg_in),
        n0(std::min((size_t)arg_out.extent(0), (size_t)arg_in.extent(0))),
        n1(std::min((size_t)arg_out.extent(1), (size_t)arg_in.extent(1))),
        n2(std::min((size_t)arg_out.extent(2), (size_t)arg_in.extent(2))),
        n3(std::min((size_t)arg_out.extent(3), (size_t)arg_in.extent(3))),
        n4(std::min((size_t)arg_out.extent(4), (size_t)arg_in.extent(4))),
        n5(std::min((size_t)arg_out.extent(5), (size_t)arg_in.extent(5))),
        n6(std::min((size_t)arg_out.extent(6), (size_t)arg_in.extent(6))),
        n7(std::min((size_t)arg_out.extent(7), (size_t)arg_in.extent(7))) {
    using Policy = Kokkos::RangePolicy<ExecSpace>;

    Kokkos::parallel_for("Kokkos::DynRankViewRemap", Policy(exec_space, 0, n0),
                         *this);
  }

  DynRankViewRemap(const OutputView& arg_out, const InputView& arg_in)
      : output(arg_out),
        input(arg_in),
        n0(std::min((size_t)arg_out.extent(0), (size_t)arg_in.extent(0))),
        n1(std::min((size_t)arg_out.extent(1), (size_t)arg_in.extent(1))),
        n2(std::min((size_t)arg_out.extent(2), (size_t)arg_in.extent(2))),
        n3(std::min((size_t)arg_out.extent(3), (size_t)arg_in.extent(3))),
        n4(std::min((size_t)arg_out.extent(4), (size_t)arg_in.extent(4))),
        n5(std::min((size_t)arg_out.extent(5), (size_t)arg_in.extent(5))),
        n6(std::min((size_t)arg_out.extent(6), (size_t)arg_in.extent(6))),
        n7(std::min((size_t)arg_out.extent(7), (size_t)arg_in.extent(7))) {
    using Policy = Kokkos::RangePolicy<ExecSpace>;

    Kokkos::parallel_for("Kokkos::DynRankViewRemap", Policy(0, n0), *this);
  }

  KOKKOS_INLINE_FUNCTION
  void operator()(const size_t i0) const {
    for (size_t i1 = 0; i1 < n1; ++i1) {
      for (size_t i2 = 0; i2 < n2; ++i2) {
        for (size_t i3 = 0; i3 < n3; ++i3) {
          for (size_t i4 = 0; i4 < n4; ++i4) {
            for (size_t i5 = 0; i5 < n5; ++i5) {
              for (size_t i6 = 0; i6 < n6; ++i6) {
                output.access(i0, i1, i2, i3, i4, i5, i6) =
                    input.access(i0, i1, i2, i3, i4, i5, i6);
              }
            }
          }
        }
      }
    }
  }
};

} /* namespace Impl */
} /* namespace Kokkos */

namespace Kokkos {

namespace Impl {

/* \brief Returns a View of the requested rank, aliasing the
   underlying memory, to facilitate implementation of deep_copy() and
   other routines that are defined on View */
template <unsigned N, typename T, typename... Args>
KOKKOS_FUNCTION View<typename ViewDataTypeFromRank<T, N>::type, Args...>
as_view_of_rank_n(
    DynRankView<T, Args...> v,
    std::enable_if_t<
        std::is_same_v<typename ViewTraits<T, Args...>::specialize, void>>*) {
  if (v.rank() != N) {
    KOKKOS_IF_ON_HOST(
        const std::string message =
            "Converting DynRankView of rank " + std::to_string(v.rank()) +
            " to a View of mis-matched rank " + std::to_string(N) + "!";
        Kokkos::abort(message.c_str());)
    KOKKOS_IF_ON_DEVICE(
        Kokkos::abort("Converting DynRankView to a View of mis-matched rank!");)
  }

  auto layout = v.DownCast().layout();

  if constexpr (std::is_same_v<decltype(layout), Kokkos::LayoutLeft> ||
                std::is_same_v<decltype(layout), Kokkos::LayoutRight> ||
                std::is_same_v<decltype(layout), Kokkos::LayoutStride>) {
    for (int i = N; i < 7; ++i)
      layout.dimension[i] = KOKKOS_IMPL_CTOR_DEFAULT_ARG;
  }

#ifndef KOKKOS_ENABLE_IMPL_VIEW_LEGACY
  if constexpr (ViewTraits<T, Args...>::impl_is_customized) {
    return View<typename RankDataType<T, N>::type, Args...>(
        Kokkos::view_wrap(
            v.data(), Kokkos::Impl::AccessorArg_t{v.accessor().fad_size() + 1}),
        layout);
  } else
#endif
    return View<typename RankDataType<T, N>::type, Args...>(v.data(), layout);
}

template <typename... Args>
struct ApplyToViewOfStaticRank<DynRankView<Args...>> {
  template <typename Function>
  static void apply(Function&& f, DynRankView<Args...> a) {
    switch (rank(a)) {
      case 0: f(as_view_of_rank_n<0>(a)); break;
      case 1: f(as_view_of_rank_n<1>(a)); break;
      case 2: f(as_view_of_rank_n<2>(a)); break;
      case 3: f(as_view_of_rank_n<3>(a)); break;
      case 4: f(as_view_of_rank_n<4>(a)); break;
      case 5: f(as_view_of_rank_n<5>(a)); break;
      case 6: f(as_view_of_rank_n<6>(a)); break;
      case 7: f(as_view_of_rank_n<7>(a)); break;
      default:
        KOKKOS_IF_ON_HOST(
            Kokkos::abort(
                std::string(
                    "Trying to apply a function to a view of unexpected rank " +
                    std::to_string(rank(a)))
                    .c_str());)
        KOKKOS_IF_ON_DEVICE(
            Kokkos::abort(
                "Trying to apply a function to a view of unexpected rank");)
    }
  }
};

}  // namespace Impl

/** \brief  Deep copy a value from Host memory into a view.  */
template <class ExecSpace, class DT, class... DP>
inline void deep_copy(
    const ExecSpace& e, const DynRankView<DT, DP...>& dst,
    typename ViewTraits<DT, DP...>::const_value_type& value,
    std::enable_if_t<std::is_same_v<typename ViewTraits<DT, DP...>::specialize,
                                    void>>* = nullptr) {
  static_assert(
      std::is_same_v<typename ViewTraits<DT, DP...>::non_const_value_type,
                     typename ViewTraits<DT, DP...>::value_type>,
      "deep_copy requires non-const type");

  Impl::ApplyToViewOfStaticRank<DynRankView<DT, DP...>>::apply(
      [=](auto view) { deep_copy(e, view, value); }, dst);
}

template <class DT, class... DP>
inline void deep_copy(
    const DynRankView<DT, DP...>& dst,
    typename ViewTraits<DT, DP...>::const_value_type& value,
    std::enable_if_t<std::is_same_v<typename ViewTraits<DT, DP...>::specialize,
                                    void>>* = nullptr) {
  Impl::ApplyToViewOfStaticRank<DynRankView<DT, DP...>>::apply(
      [=](auto view) { deep_copy(view, value); }, dst);
}

/** \brief  Deep copy into a value in Host memory from a view.  */
template <class ExecSpace, class ST, class... SP>
inline void deep_copy(
    const ExecSpace& e,
    typename ViewTraits<ST, SP...>::non_const_value_type& dst,
    const DynRankView<ST, SP...>& src,
    std::enable_if_t<std::is_same_v<typename ViewTraits<ST, SP...>::specialize,
                                    void>>* = 0) {
  deep_copy(e, dst, Impl::as_view_of_rank_n<0>(src));
}

template <class ST, class... SP>
inline void deep_copy(
    typename ViewTraits<ST, SP...>::non_const_value_type& dst,
    const DynRankView<ST, SP...>& src,
    std::enable_if_t<std::is_same_v<typename ViewTraits<ST, SP...>::specialize,
                                    void>>* = 0) {
  deep_copy(dst, Impl::as_view_of_rank_n<0>(src));
}

//----------------------------------------------------------------------------
/** \brief  A deep copy between views of the default specialization, compatible
 * type, same rank, same contiguous layout.
 *
 * A rank mismatch will error out in the attempt to convert to a View
 */
template <class ExecSpace, class DstType, class SrcType>
inline void deep_copy(
    const ExecSpace& exec_space, const DstType& dst, const SrcType& src,
    std::enable_if_t<(std::is_void_v<typename DstType::traits::specialize> &&
                      std::is_void_v<typename SrcType::traits::specialize> &&
                      (Kokkos::is_dyn_rank_view<DstType>::value ||
                       Kokkos::is_dyn_rank_view<SrcType>::value))>* = nullptr) {
  static_assert(std::is_same_v<typename DstType::traits::value_type,
                               typename DstType::traits::non_const_value_type>,
                "deep_copy requires non-const destination type");

  switch (rank(dst)) {
    case 0:
      deep_copy(exec_space, Impl::as_view_of_rank_n<0>(dst),
                Impl::as_view_of_rank_n<0>(src));
      break;
    case 1:
      deep_copy(exec_space, Impl::as_view_of_rank_n<1>(dst),
                Impl::as_view_of_rank_n<1>(src));
      break;
    case 2:
      deep_copy(exec_space, Impl::as_view_of_rank_n<2>(dst),
                Impl::as_view_of_rank_n<2>(src));
      break;
    case 3:
      deep_copy(exec_space, Impl::as_view_of_rank_n<3>(dst),
                Impl::as_view_of_rank_n<3>(src));
      break;
    case 4:
      deep_copy(exec_space, Impl::as_view_of_rank_n<4>(dst),
                Impl::as_view_of_rank_n<4>(src));
      break;
    case 5:
      deep_copy(exec_space, Impl::as_view_of_rank_n<5>(dst),
                Impl::as_view_of_rank_n<5>(src));
      break;
    case 6:
      deep_copy(exec_space, Impl::as_view_of_rank_n<6>(dst),
                Impl::as_view_of_rank_n<6>(src));
      break;
    case 7:
      deep_copy(exec_space, Impl::as_view_of_rank_n<7>(dst),
                Impl::as_view_of_rank_n<7>(src));
      break;
    default:
      Kokkos::Impl::throw_runtime_exception(
          "Calling DynRankView deep_copy with a view of unexpected rank " +
          std::to_string(rank(dst)));
  }
}

template <class DstType, class SrcType>
inline void deep_copy(
    const DstType& dst, const SrcType& src,
    std::enable_if_t<(std::is_void_v<typename DstType::traits::specialize> &&
                      std::is_void_v<typename SrcType::traits::specialize> &&
                      (Kokkos::is_dyn_rank_view<DstType>::value ||
                       Kokkos::is_dyn_rank_view<SrcType>::value))>* = nullptr) {
  static_assert(std::is_same_v<typename DstType::traits::value_type,
                               typename DstType::traits::non_const_value_type>,
                "deep_copy requires non-const destination type");

  switch (rank(dst)) {
    case 0:
      deep_copy(Impl::as_view_of_rank_n<0>(dst),
                Impl::as_view_of_rank_n<0>(src));
      break;
    case 1:
      deep_copy(Impl::as_view_of_rank_n<1>(dst),
                Impl::as_view_of_rank_n<1>(src));
      break;
    case 2:
      deep_copy(Impl::as_view_of_rank_n<2>(dst),
                Impl::as_view_of_rank_n<2>(src));
      break;
    case 3:
      deep_copy(Impl::as_view_of_rank_n<3>(dst),
                Impl::as_view_of_rank_n<3>(src));
      break;
    case 4:
      deep_copy(Impl::as_view_of_rank_n<4>(dst),
                Impl::as_view_of_rank_n<4>(src));
      break;
    case 5:
      deep_copy(Impl::as_view_of_rank_n<5>(dst),
                Impl::as_view_of_rank_n<5>(src));
      break;
    case 6:
      deep_copy(Impl::as_view_of_rank_n<6>(dst),
                Impl::as_view_of_rank_n<6>(src));
      break;
    case 7:
      deep_copy(Impl::as_view_of_rank_n<7>(dst),
                Impl::as_view_of_rank_n<7>(src));
      break;
    default:
      Kokkos::Impl::throw_runtime_exception(
          "Calling DynRankView deep_copy with a view of unexpected rank " +
          std::to_string(rank(dst)));
  }
}

}  // namespace Kokkos

//----------------------------------------------------------------------------
//----------------------------------------------------------------------------

namespace Kokkos {
namespace Impl {

// Deduce Mirror Types
template <class Space, class T, class... P>
struct MirrorDRViewType {
  // The incoming view_type
  using src_view_type = typename Kokkos::DynRankView<T, P...>;
  // The memory space for the mirror view
  using memory_space = typename Space::memory_space;
  // Check whether it is the same memory space
  enum {
    is_same_memspace =
        std::is_same_v<memory_space, typename src_view_type::memory_space>
  };
  // The array_layout
  using array_layout = typename src_view_type::array_layout;
  // The data type (we probably want it non-const since otherwise we can't even
  // deep_copy to it.
  using data_type = typename src_view_type::non_const_data_type;
  // The destination view type if it is not the same memory space
  using dest_view_type = Kokkos::DynRankView<data_type, array_layout, Space>;
  // If it is the same memory_space return the existsing view_type
  // This will also keep the unmanaged trait if necessary
  using view_type =
      std::conditional_t<is_same_memspace, src_view_type, dest_view_type>;
};

}  // namespace Impl

namespace Impl {

// create a mirror
// private interface that accepts arbitrary view constructor args passed by a
// view_alloc
template <class T, class... P, class... ViewCtorArgs>
inline auto create_mirror(const DynRankView<T, P...>& src,
                          const Impl::ViewCtorProp<ViewCtorArgs...>& arg_prop) {
  if constexpr (Impl::ViewCtorProp<ViewCtorArgs...>::has_memory_space) {
    using dst_type = typename Impl::MirrorDRViewType<
        typename Impl::ViewCtorProp<ViewCtorArgs...>::memory_space, T,
        P...>::dest_view_type;
    return dst_type(create_mirror(arg_prop, src.DownCast()), src.rank());
  } else {
    using src_type = DynRankView<T, P...>;
    using dst_type = typename src_type::host_mirror_type;

    return dst_type(create_mirror(arg_prop, src.DownCast()), src.rank());
  }
}

}  // namespace Impl

// public interface
template <class T, class... P,
          class Enable = std::enable_if_t<
              std::is_void_v<typename ViewTraits<T, P...>::specialize>>>
inline auto create_mirror(const DynRankView<T, P...>& src) {
  return Impl::create_mirror(src, Kokkos::view_alloc());
}

// public interface that accepts a without initializing flag
template <class T, class... P,
          class Enable = std::enable_if_t<
              std::is_void_v<typename ViewTraits<T, P...>::specialize>>>
inline auto create_mirror(Kokkos::Impl::WithoutInitializing_t wi,
                          const DynRankView<T, P...>& src) {
  return Impl::create_mirror(src, Kokkos::view_alloc(wi));
}

// public interface that accepts a space
template <class Space, class T, class... P,
          class Enable = std::enable_if_t<
              Kokkos::is_space<Space>::value &&
              std::is_void_v<typename ViewTraits<T, P...>::specialize>>>
inline auto create_mirror(const Space&,
                          const Kokkos::DynRankView<T, P...>& src) {
  return Impl::create_mirror(
      src, Kokkos::view_alloc(typename Space::memory_space{}));
}

// public interface that accepts a space and a without initializing flag
template <class Space, class T, class... P,
          class Enable = std::enable_if_t<
              Kokkos::is_space<Space>::value &&
              std::is_void_v<typename ViewTraits<T, P...>::specialize>>>
inline auto create_mirror(Kokkos::Impl::WithoutInitializing_t wi, const Space&,
                          const Kokkos::DynRankView<T, P...>& src) {
  return Impl::create_mirror(
      src, Kokkos::view_alloc(wi, typename Space::memory_space{}));
}

// public interface that accepts arbitrary view constructor args passed by a
// view_alloc
template <class T, class... P, class... ViewCtorArgs,
          typename Enable = std::enable_if_t<
              std::is_void_v<typename ViewTraits<T, P...>::specialize>>>
inline auto create_mirror(const Impl::ViewCtorProp<ViewCtorArgs...>& arg_prop,
                          const DynRankView<T, P...>& src) {
  return Impl::create_mirror(src, arg_prop);
}

namespace Impl {

// create a mirror view
// private interface that accepts arbitrary view constructor args passed by a
// view_alloc
template <class T, class... P, class... ViewCtorArgs>
inline auto create_mirror_view(
    const DynRankView<T, P...>& src,
    [[maybe_unused]] const typename Impl::ViewCtorProp<ViewCtorArgs...>&
        arg_prop) {
  if constexpr (!Impl::ViewCtorProp<ViewCtorArgs...>::has_memory_space) {
    if constexpr (std::is_same_v<typename DynRankView<T, P...>::memory_space,
                                 typename DynRankView<T, P...>::
                                     host_mirror_type::memory_space> &&
                  std::is_same_v<typename DynRankView<T, P...>::data_type,
                                 typename DynRankView<
                                     T, P...>::host_mirror_type::data_type>) {
      return typename DynRankView<T, P...>::host_mirror_type(src);
    } else {
      return Kokkos::Impl::choose_create_mirror(src, arg_prop);
    }
  } else {
    if constexpr (Impl::MirrorDRViewType<typename Impl::ViewCtorProp<
                                             ViewCtorArgs...>::memory_space,
                                         T, P...>::is_same_memspace) {
      return typename Impl::MirrorDRViewType<
          typename Impl::ViewCtorProp<ViewCtorArgs...>::memory_space, T,
          P...>::view_type(src);
    } else {
      return Kokkos::Impl::choose_create_mirror(src, arg_prop);
    }
  }
}

}  // namespace Impl

// public interface
template <class T, class... P>
inline auto create_mirror_view(const Kokkos::DynRankView<T, P...>& src) {
  return Impl::create_mirror_view(src, Kokkos::view_alloc());
}

// public interface that accepts a without initializing flag
template <class T, class... P>
inline auto create_mirror_view(Kokkos::Impl::WithoutInitializing_t wi,
                               const DynRankView<T, P...>& src) {
  return Impl::create_mirror_view(src, Kokkos::view_alloc(wi));
}

// public interface that accepts a space
template <class Space, class T, class... P,
          class Enable = std::enable_if_t<Kokkos::is_space<Space>::value>>
inline auto create_mirror_view(const Space&,
                               const Kokkos::DynRankView<T, P...>& src) {
  return Impl::create_mirror_view(
      src, Kokkos::view_alloc(typename Space::memory_space()));
}

// public interface that accepts a space and a without initializing flag
template <class Space, class T, class... P,
          typename Enable = std::enable_if_t<Kokkos::is_space<Space>::value>>
inline auto create_mirror_view(Kokkos::Impl::WithoutInitializing_t wi,
                               const Space&,
                               const Kokkos::DynRankView<T, P...>& src) {
  return Impl::create_mirror_view(
      src, Kokkos::view_alloc(typename Space::memory_space{}, wi));
}

// public interface that accepts arbitrary view constructor args passed by a
// view_alloc
template <class T, class... P, class... ViewCtorArgs>
inline auto create_mirror_view(
    const typename Impl::ViewCtorProp<ViewCtorArgs...>& arg_prop,
    const Kokkos::DynRankView<T, P...>& src) {
  return Impl::create_mirror_view(src, arg_prop);
}

// create a mirror view and deep copy it
// public interface that accepts arbitrary view constructor args passed by a
// view_alloc
template <class... ViewCtorArgs, class T, class... P,
          class Enable = std::enable_if_t<
              std::is_void_v<typename ViewTraits<T, P...>::specialize>>>
auto create_mirror_view_and_copy(
    [[maybe_unused]] const Impl::ViewCtorProp<ViewCtorArgs...>& arg_prop,
    const Kokkos::DynRankView<T, P...>& src) {
  using alloc_prop_input = Impl::ViewCtorProp<ViewCtorArgs...>;

  Impl::check_view_ctor_args_create_mirror_view_and_copy<ViewCtorArgs...>();

  if constexpr (Impl::MirrorDRViewType<
                    typename Impl::ViewCtorProp<ViewCtorArgs...>::memory_space,
                    T, P...>::is_same_memspace) {
    // same behavior as deep_copy(src, src)
    if constexpr (!alloc_prop_input::has_execution_space)
      fence(
          "Kokkos::create_mirror_view_and_copy: fence before returning src "
          "view");
    return src;
  } else {
    using Space  = typename alloc_prop_input::memory_space;
    using Mirror = typename Impl::MirrorDRViewType<Space, T, P...>::view_type;

    auto arg_prop_copy = Impl::with_properties_if_unset(
        arg_prop, std::string{}, WithoutInitializing,
        typename Space::execution_space{});

    std::string& label = Impl::get_property<Impl::LabelTag>(arg_prop_copy);
    if (label.empty()) label = src.label();
    auto mirror = typename Mirror::non_const_type{
        arg_prop_copy, Impl::reconstructLayout(src.layout(), src.rank())};
    if constexpr (alloc_prop_input::has_execution_space) {
      deep_copy(Impl::get_property<Impl::ExecutionSpaceTag>(arg_prop_copy),
                mirror, src);
    } else
      deep_copy(mirror, src);
    return mirror;
  }
}

template <class Space, class T, class... P>
auto create_mirror_view_and_copy(const Space&,
                                 const Kokkos::DynRankView<T, P...>& src,
                                 std::string const& name = "") {
  return create_mirror_view_and_copy(
      Kokkos::view_alloc(typename Space::memory_space{}, name), src);
}

}  // namespace Kokkos

//----------------------------------------------------------------------------
//----------------------------------------------------------------------------

namespace Kokkos {
/** \brief  Resize a view with copying old data to new data at the corresponding
 * indices. */
template <class... ViewCtorArgs, class T, class... P>
inline void impl_resize(const Impl::ViewCtorProp<ViewCtorArgs...>& arg_prop,
                        DynRankView<T, P...>& v, const size_t n0,
                        const size_t n1, const size_t n2, const size_t n3,
                        const size_t n4, const size_t n5, const size_t n6,
                        const size_t n7) {
  using drview_type      = DynRankView<T, P...>;
  using alloc_prop_input = Impl::ViewCtorProp<ViewCtorArgs...>;

  static_assert(!Kokkos::ViewTraits<T, P...>::memory_traits::is_unmanaged,
                "Can only resize managed views");
  static_assert(!alloc_prop_input::has_label,
                "The view constructor arguments passed to Kokkos::resize "
                "must not include a label!");
  static_assert(!alloc_prop_input::has_pointer,
                "The view constructor arguments passed to Kokkos::resize must "
                "not include a pointer!");
  static_assert(!alloc_prop_input::has_memory_space,
                "The view constructor arguments passed to Kokkos::resize must "
                "not include a memory space instance!");

  auto prop_copy = Impl::with_properties_if_unset(
      arg_prop, v.label(), typename drview_type::execution_space{});

  drview_type v_resized(prop_copy, n0, n1, n2, n3, n4, n5, n6, n7);

  if constexpr (alloc_prop_input::has_execution_space)
    Kokkos::Impl::DynRankViewRemap<drview_type, drview_type>(
        Impl::get_property<Impl::ExecutionSpaceTag>(prop_copy), v_resized, v);
  else {
    // NOLINTNEXTLINE(bugprone-unused-raii)
    Kokkos::Impl::DynRankViewRemap<drview_type, drview_type>(v_resized, v);
    Kokkos::fence("Kokkos::resize(DynRankView)");
  }
  v = v_resized;
}

template <class T, class... P>
inline void resize(DynRankView<T, P...>& v,
                   const size_t n0 = KOKKOS_INVALID_INDEX,
                   const size_t n1 = KOKKOS_INVALID_INDEX,
                   const size_t n2 = KOKKOS_INVALID_INDEX,
                   const size_t n3 = KOKKOS_INVALID_INDEX,
                   const size_t n4 = KOKKOS_INVALID_INDEX,
                   const size_t n5 = KOKKOS_INVALID_INDEX,
                   const size_t n6 = KOKKOS_INVALID_INDEX,
                   const size_t n7 = KOKKOS_INVALID_INDEX) {
  impl_resize(Impl::ViewCtorProp<>{}, v, n0, n1, n2, n3, n4, n5, n6, n7);
}

template <class... ViewCtorArgs, class T, class... P>
void resize(const Impl::ViewCtorProp<ViewCtorArgs...>& arg_prop,
            DynRankView<T, P...>& v,
            const size_t n0 = KOKKOS_IMPL_CTOR_DEFAULT_ARG,
            const size_t n1 = KOKKOS_IMPL_CTOR_DEFAULT_ARG,
            const size_t n2 = KOKKOS_IMPL_CTOR_DEFAULT_ARG,
            const size_t n3 = KOKKOS_IMPL_CTOR_DEFAULT_ARG,
            const size_t n4 = KOKKOS_IMPL_CTOR_DEFAULT_ARG,
            const size_t n5 = KOKKOS_IMPL_CTOR_DEFAULT_ARG,
            const size_t n6 = KOKKOS_IMPL_CTOR_DEFAULT_ARG,
            const size_t n7 = KOKKOS_IMPL_CTOR_DEFAULT_ARG) {
  impl_resize(arg_prop, v, n0, n1, n2, n3, n4, n5, n6, n7);
}

template <class I, class T, class... P>
inline std::enable_if_t<Impl::is_view_ctor_property<I>::value> resize(
    const I& arg_prop, DynRankView<T, P...>& v,
    const size_t n0 = KOKKOS_INVALID_INDEX,
    const size_t n1 = KOKKOS_INVALID_INDEX,
    const size_t n2 = KOKKOS_INVALID_INDEX,
    const size_t n3 = KOKKOS_INVALID_INDEX,
    const size_t n4 = KOKKOS_INVALID_INDEX,
    const size_t n5 = KOKKOS_INVALID_INDEX,
    const size_t n6 = KOKKOS_INVALID_INDEX,
    const size_t n7 = KOKKOS_INVALID_INDEX) {
  impl_resize(Kokkos::view_alloc(arg_prop), v, n0, n1, n2, n3, n4, n5, n6, n7);
}

/** \brief  Resize a view with copying old data to new data at the corresponding
 * indices. */
template <class... ViewCtorArgs, class T, class... P>
inline void impl_realloc(DynRankView<T, P...>& v, const size_t n0,
                         const size_t n1, const size_t n2, const size_t n3,
                         const size_t n4, const size_t n5, const size_t n6,
                         const size_t n7,
                         const Impl::ViewCtorProp<ViewCtorArgs...>& arg_prop) {
  using drview_type      = DynRankView<T, P...>;
  using alloc_prop_input = Impl::ViewCtorProp<ViewCtorArgs...>;

  static_assert(!Kokkos::ViewTraits<T, P...>::memory_traits::is_unmanaged,
                "Can only realloc managed views");
  static_assert(!alloc_prop_input::has_label,
                "The view constructor arguments passed to Kokkos::realloc must "
                "not include a label!");
  static_assert(!alloc_prop_input::has_pointer,
                "The view constructor arguments passed to Kokkos::realloc must "
                "not include a pointer!");
  static_assert(!alloc_prop_input::has_memory_space,
                "The view constructor arguments passed to Kokkos::realloc must "
                "not include a memory space instance!");

  auto arg_prop_copy = Impl::with_properties_if_unset(arg_prop, v.label());

  v = drview_type();  // Deallocate first, if the only view to allocation
  v = drview_type(arg_prop_copy, n0, n1, n2, n3, n4, n5, n6, n7);
}

template <class T, class... P, class... ViewCtorArgs>
inline void realloc(const Impl::ViewCtorProp<ViewCtorArgs...>& arg_prop,
                    DynRankView<T, P...>& v,
                    const size_t n0 = KOKKOS_INVALID_INDEX,
                    const size_t n1 = KOKKOS_INVALID_INDEX,
                    const size_t n2 = KOKKOS_INVALID_INDEX,
                    const size_t n3 = KOKKOS_INVALID_INDEX,
                    const size_t n4 = KOKKOS_INVALID_INDEX,
                    const size_t n5 = KOKKOS_INVALID_INDEX,
                    const size_t n6 = KOKKOS_INVALID_INDEX,
                    const size_t n7 = KOKKOS_INVALID_INDEX) {
  impl_realloc(v, n0, n1, n2, n3, n4, n5, n6, n7, arg_prop);
}

template <class T, class... P>
inline void realloc(DynRankView<T, P...>& v,
                    const size_t n0 = KOKKOS_INVALID_INDEX,
                    const size_t n1 = KOKKOS_INVALID_INDEX,
                    const size_t n2 = KOKKOS_INVALID_INDEX,
                    const size_t n3 = KOKKOS_INVALID_INDEX,
                    const size_t n4 = KOKKOS_INVALID_INDEX,
                    const size_t n5 = KOKKOS_INVALID_INDEX,
                    const size_t n6 = KOKKOS_INVALID_INDEX,
                    const size_t n7 = KOKKOS_INVALID_INDEX) {
  impl_realloc(v, n0, n1, n2, n3, n4, n5, n6, n7, Impl::ViewCtorProp<>{});
}

template <class I, class T, class... P>
inline std::enable_if_t<Impl::is_view_ctor_property<I>::value> realloc(
    const I& arg_prop, DynRankView<T, P...>& v,
    const size_t n0 = KOKKOS_INVALID_INDEX,
    const size_t n1 = KOKKOS_INVALID_INDEX,
    const size_t n2 = KOKKOS_INVALID_INDEX,
    const size_t n3 = KOKKOS_INVALID_INDEX,
    const size_t n4 = KOKKOS_INVALID_INDEX,
    const size_t n5 = KOKKOS_INVALID_INDEX,
    const size_t n6 = KOKKOS_INVALID_INDEX,
    const size_t n7 = KOKKOS_INVALID_INDEX) {
  impl_realloc(v, n0, n1, n2, n3, n4, n5, n6, n7, Kokkos::view_alloc(arg_prop));
}

namespace Experimental {
template <class T, class... P>
struct python_view_type<DynRankView<T, P...>> {
  using type = Kokkos::Impl::python_view_type_impl_t<
      typename DynRankView<T, P...>::type>;
};
}  // namespace Experimental

}  // namespace Kokkos

#ifdef KOKKOS_IMPL_PUBLIC_INCLUDE_NOTDEFINED_DYNRANKVIEW
#undef KOKKOS_IMPL_PUBLIC_INCLUDE
#undef KOKKOS_IMPL_PUBLIC_INCLUDE_NOTDEFINED_DYNRANKVIEW
#endif
#endif