/*
//@HEADER
// ************************************************************************
//
//                        Kokkos v. 3.0
//       Copyright (2020) National Technology & Engineering
//               Solutions of Sandia, LLC (NTESS).
//
// Under the terms of Contract DE-NA0003525 with NTESS,
// the U.S. Government retains certain rights in this software.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY NTESS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NTESS OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact Christian R. Trott (crtrott@sandia.gov)
//
// ************************************************************************
//@HEADER
*/

/// \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

#include <Kokkos_Core.hpp>
#include <impl/Kokkos_Error.hpp>
#include <type_traits>

namespace Kokkos {

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

namespace Impl {

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 (
        (N6 == unspecified && N5 == unspecified && N4 == unspecified &&
         N3 == unspecified && N2 == unspecified && N1 == unspecified &&
         N0 == unspecified)
            ? 0
            : ((N6 == unspecified && N5 == unspecified && N4 == unspecified &&
                N3 == unspecified && N2 == unspecified && N1 == unspecified)
                   ? 1
                   : ((N6 == unspecified && N5 == unspecified &&
                       N4 == unspecified && N3 == unspecified &&
                       N2 == unspecified)
                          ? 2
                          : ((N6 == unspecified && N5 == unspecified &&
                              N4 == unspecified && N3 == unspecified)
                                 ? 3
                                 : ((N6 == unspecified && N5 == unspecified &&
                                     N4 == unspecified)
                                        ? 4
                                        : ((N6 == unspecified &&
                                            N5 == unspecified)
                                               ? 5
                                               : ((N6 == unspecified)
                                                      ? 6
                                                      : 7)))))));
  }

  // 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.
  // Non-strided Layout
  template <typename Layout>
  KOKKOS_INLINE_FUNCTION static typename std::enable_if<
      (std::is_same<Layout, Kokkos::LayoutRight>::value ||
       std::is_same<Layout, Kokkos::LayoutLeft>::value),
      Layout>::type
  createLayout(const Layout& layout) {
    return 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] : 1);
  }

  // LayoutStride
  template <typename Layout>
  KOKKOS_INLINE_FUNCTION static typename std::enable_if<
      (std::is_same<Layout, Kokkos::LayoutStride>::value), Layout>::type
  createLayout(const Layout& layout) {
    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] : 1,
                  layout.stride[7]);
  }

  // Extra overload to match that for specialize types
  template <typename Traits, typename... P>
  KOKKOS_INLINE_FUNCTION static typename std::enable_if<
      (std::is_same<typename Traits::array_layout,
                    Kokkos::LayoutRight>::value ||
       std::is_same<typename Traits::array_layout, Kokkos::LayoutLeft>::value ||
       std::is_same<typename Traits::array_layout,
                    Kokkos::LayoutStride>::value),
      typename Traits::array_layout>::type
  createLayout(const Kokkos::Impl::ViewCtorProp<P...>& /* prop */,
               const typename Traits::array_layout& layout) {
    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 static
    typename std::enable_if<(std::is_same<Layout, Kokkos::LayoutRight>::value ||
                             std::is_same<Layout, Kokkos::LayoutLeft>::value) &&
                                std::is_integral<iType>::value,
                            Layout>::type
    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 static typename std::enable_if<
    (std::is_same<Layout, Kokkos::LayoutStride>::value) &&
        std::is_integral<iType>::value,
    Layout>::type
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) {
    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...)) {
#if defined(KOKKOS_ACTIVE_EXECUTION_MEMORY_SPACE_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));
#else
    (void)tracker;
    Kokkos::abort("DynRankView bounds error");
#endif
  }
}

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

}  // namespace Impl

namespace Impl {

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

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

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

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

  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...

    typedef typename DstType::offset_type dst_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);
    dst.m_track.assign(src.m_track, DstTraits::is_managed);
    dst.m_rank = src.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 <typename DataType, class... Properties>
class DynRankView : public ViewTraits<DataType, Properties...> {
  static_assert(!std::is_array<DataType>::value &&
                    !std::is_pointer<DataType>::value,
                "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;

 public:
  typedef ViewTraits<DataType, Properties...> drvtraits;

  typedef View<DataType*******, Properties...> view_type;

  typedef ViewTraits<DataType*******, Properties...> traits;

 private:
  typedef Kokkos::Impl::ViewMapping<traits, typename traits::specialize>
      map_type;
  typedef Kokkos::Impl::SharedAllocationTracker track_type;

  track_type m_track;
  map_type m_map;
  unsigned m_rank;

 public:
  KOKKOS_INLINE_FUNCTION
  view_type& DownCast() const { return (view_type&)(*this); }
  KOKKOS_INLINE_FUNCTION
  const view_type& ConstDownCast() const { return (const view_type&)(*this); }

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

  /** \brief  Compatible view of array of scalar types */
  typedef DynRankView<
      typename drvtraits::scalar_array_type, typename drvtraits::array_layout,
      typename drvtraits::device_type, typename drvtraits::memory_traits>
      array_type;

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

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

  /** \brief  Compatible HostMirror view */
  typedef DynRankView<typename drvtraits::non_const_data_type,
                      typename drvtraits::array_layout,
                      typename drvtraits::host_mirror_space>
      HostMirror;

  //----------------------------------------
  // Domain rank and extents

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

  template <typename iType>
  KOKKOS_INLINE_FUNCTION constexpr
      typename std::enable_if<std::is_integral<iType>::value, size_t>::type
      extent(const iType& r) const {
    return m_map.extent(r);
  }

  template <typename iType>
  KOKKOS_INLINE_FUNCTION constexpr
      typename std::enable_if<std::is_integral<iType>::value, int>::type
      extent_int(const iType& r) const {
    return static_cast<int>(m_map.extent(r));
  }

  KOKKOS_INLINE_FUNCTION constexpr typename traits::array_layout layout()
      const {
    return m_map.layout();
  }

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

#ifdef KOKKOS_ENABLE_DEPRECATED_CODE
  template <typename iType>
  KOKKOS_INLINE_FUNCTION constexpr
      typename std::enable_if<std::is_integral<iType>::value, size_t>::type
      dimension(const iType& r) const {
    return extent(r);
  }

  KOKKOS_INLINE_FUNCTION constexpr size_t dimension_0() const {
    return m_map.dimension_0();
  }
  KOKKOS_INLINE_FUNCTION constexpr size_t dimension_1() const {
    return m_map.dimension_1();
  }
  KOKKOS_INLINE_FUNCTION constexpr size_t dimension_2() const {
    return m_map.dimension_2();
  }
  KOKKOS_INLINE_FUNCTION constexpr size_t dimension_3() const {
    return m_map.dimension_3();
  }
  KOKKOS_INLINE_FUNCTION constexpr size_t dimension_4() const {
    return m_map.dimension_4();
  }
  KOKKOS_INLINE_FUNCTION constexpr size_t dimension_5() const {
    return m_map.dimension_5();
  }
  KOKKOS_INLINE_FUNCTION constexpr size_t dimension_6() const {
    return m_map.dimension_6();
  }
  KOKKOS_INLINE_FUNCTION constexpr size_t dimension_7() const {
    return m_map.dimension_7();
  }
#endif

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

  KOKKOS_INLINE_FUNCTION constexpr size_t size() const {
    return m_map.extent(0) * m_map.extent(1) * m_map.extent(2) *
           m_map.extent(3) * m_map.extent(4) * m_map.extent(5) *
           m_map.extent(6) * m_map.extent(7);
  }

  KOKKOS_INLINE_FUNCTION constexpr size_t stride_0() const {
    return m_map.stride_0();
  }
  KOKKOS_INLINE_FUNCTION constexpr size_t stride_1() const {
    return m_map.stride_1();
  }
  KOKKOS_INLINE_FUNCTION constexpr size_t stride_2() const {
    return m_map.stride_2();
  }
  KOKKOS_INLINE_FUNCTION constexpr size_t stride_3() const {
    return m_map.stride_3();
  }
  KOKKOS_INLINE_FUNCTION constexpr size_t stride_4() const {
    return m_map.stride_4();
  }
  KOKKOS_INLINE_FUNCTION constexpr size_t stride_5() const {
    return m_map.stride_5();
  }
  KOKKOS_INLINE_FUNCTION constexpr size_t stride_6() const {
    return m_map.stride_6();
  }
  KOKKOS_INLINE_FUNCTION constexpr size_t stride_7() const {
    return m_map.stride_7();
  }

  template <typename iType>
  KOKKOS_INLINE_FUNCTION void stride(iType* const s) const {
    m_map.stride(s);
  }

  //----------------------------------------
  // Range span is the span which contains all members.

  typedef typename map_type::reference_type reference_type;
  typedef typename map_type::pointer_type pointer_type;

  enum {
    reference_type_is_lvalue_reference =
        std::is_lvalue_reference<reference_type>::value
  };

  KOKKOS_INLINE_FUNCTION constexpr size_t span() const { return m_map.span(); }
#ifdef KOKKOS_ENABLE_DEPRECATED_CODE
  // Deprecated, use 'span()' instead
  KOKKOS_INLINE_FUNCTION constexpr size_t capacity() const {
    return m_map.span();
  }
#endif
  KOKKOS_INLINE_FUNCTION constexpr bool span_is_contiguous() const {
    return m_map.span_is_contiguous();
  }
  KOKKOS_INLINE_FUNCTION constexpr pointer_type data() const {
    return m_map.data();
  }

#ifdef KOKKOS_ENABLE_DEPRECATED_CODE
  // Deprecated, use 'span_is_contigous()' instead
  KOKKOS_INLINE_FUNCTION constexpr bool is_contiguous() const {
    return m_map.span_is_contiguous();
  }
  // Deprecated, use 'data()' instead
  KOKKOS_INLINE_FUNCTION constexpr pointer_type ptr_on_device() const {
    return m_map.data();
  }
#endif

  //----------------------------------------
  // Allow specializations to query their specialized map
#ifdef KOKKOS_ENABLE_DEPRECATED_CODE
  KOKKOS_INLINE_FUNCTION
  const Kokkos::Impl::ViewMapping<traits, typename traits::specialize>&
  implementation_map() const {
    return m_map;
  }
#endif
  KOKKOS_INLINE_FUNCTION
  const Kokkos::Impl::ViewMapping<traits, typename traits::specialize>&
  impl_map() const {
    return m_map;
  }

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

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

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

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

    is_default_map = std::is_same<typename traits::specialize, void>::value &&
                     (is_layout_left || is_layout_right || is_layout_stride)
  };

  template <class Space, bool = Kokkos::Impl::MemorySpaceAccess<
                             Space, typename traits::memory_space>::accessible>
  struct verify_space {
    KOKKOS_FORCEINLINE_FUNCTION static void check() {}
  };

  template <class Space>
  struct verify_space<Space, false> {
    KOKKOS_FORCEINLINE_FUNCTION static void check() {
      Kokkos::abort(
          "Kokkos::DynRankView ERROR: attempt to access inaccessible memory "
          "space");
    };
  };

// 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)             \
  DynRankView::template verify_space<                     \
      Kokkos::Impl::ActiveExecutionMemorySpace>::check(); \
  Kokkos::Impl::dyn_rank_view_verify_operator_bounds<     \
      typename traits::memory_space>                      \
      ARG;

#else

#define KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(ARG) \
  DynRankView::template verify_space<         \
      Kokkos::Impl::ActiveExecutionMemorySpace>::check();

#endif

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

  // operators ()
  // Rank 0
  KOKKOS_INLINE_FUNCTION
  reference_type operator()() const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY((0, this->rank(), m_track, m_map))
    return impl_map().reference();
    // return m_map.reference(0,0,0,0,0,0,0);
  }

  // Rank 1
  // This assumes a contiguous underlying memory (i.e. no padding, no
  // striding...)
  template <typename iType>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      std::is_same<typename drvtraits::value_type,
                   typename drvtraits::scalar_array_type>::value &&
          std::is_integral<iType>::value,
      reference_type>::type
  operator[](const iType& i0) const {
    // Phalanx is violating this, since they use the operator to access ALL
    // elements in the allocation KOKKOS_IMPL_VIEW_OPERATOR_VERIFY( (1 ,
    // this->rank(), m_track, m_map) )
    return data()[i0];
  }

  // This assumes a contiguous underlying memory (i.e. no padding, no
  // striding... AND a Trilinos/Sacado scalar type )
  template <typename iType>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      !std::is_same<typename drvtraits::value_type,
                    typename drvtraits::scalar_array_type>::value &&
          std::is_integral<iType>::value,
      reference_type>::type
  operator[](const iType& i0) const {
    //      auto map = impl_map();
    const size_t dim_scalar = m_map.dimension_scalar();
    const size_t bytes      = this->span() / dim_scalar;

    typedef Kokkos::View<
        DataType*, typename traits::array_layout, typename traits::device_type,
        Kokkos::MemoryTraits<traits::memory_traits::is_unmanaged |
                             traits::memory_traits::is_random_access |
                             traits::memory_traits::is_atomic> >
        tmp_view_type;
    tmp_view_type rankone_view(this->data(), bytes, dim_scalar);
    return rankone_view(i0);
  }

  // Rank 1 parenthesis
  template <typename iType>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      (std::is_same<typename traits::specialize, void>::value &&
       std::is_integral<iType>::value),
      reference_type>::type
  operator()(const iType& i0) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY((1, this->rank(), m_track, m_map, i0))
    return m_map.reference(i0);
  }

  template <typename iType>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      !(std::is_same<typename traits::specialize, void>::value &&
        std::is_integral<iType>::value),
      reference_type>::type
  operator()(const iType& i0) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY((1, this->rank(), m_track, m_map, i0))
    return m_map.reference(i0, 0, 0, 0, 0, 0, 0);
  }

  // Rank 2
  template <typename iType0, typename iType1>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      (std::is_same<typename traits::specialize, void>::value &&
       std::is_integral<iType0>::value && std::is_integral<iType1>::value),
      reference_type>::type
  operator()(const iType0& i0, const iType1& i1) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY((2, this->rank(), m_track, m_map, i0, i1))
    return m_map.reference(i0, i1);
  }

  template <typename iType0, typename iType1>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      !(std::is_same<typename drvtraits::specialize, void>::value &&
        std::is_integral<iType0>::value),
      reference_type>::type
  operator()(const iType0& i0, const iType1& i1) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY((2, this->rank(), m_track, m_map, i0, i1))
    return m_map.reference(i0, i1, 0, 0, 0, 0, 0);
  }

  // Rank 3
  template <typename iType0, typename iType1, typename iType2>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      (std::is_same<typename traits::specialize, void>::value &&
       std::is_integral<iType0>::value && std::is_integral<iType1>::value &&
       std::is_integral<iType2>::value),
      reference_type>::type
  operator()(const iType0& i0, const iType1& i1, const iType2& i2) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (3, this->rank(), m_track, m_map, i0, i1, i2))
    return m_map.reference(i0, i1, i2);
  }

  template <typename iType0, typename iType1, typename iType2>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      !(std::is_same<typename drvtraits::specialize, void>::value &&
        std::is_integral<iType0>::value),
      reference_type>::type
  operator()(const iType0& i0, const iType1& i1, const iType2& i2) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (3, this->rank(), m_track, m_map, i0, i1, i2))
    return m_map.reference(i0, i1, i2, 0, 0, 0, 0);
  }

  // Rank 4
  template <typename iType0, typename iType1, typename iType2, typename iType3>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      (std::is_same<typename traits::specialize, void>::value &&
       std::is_integral<iType0>::value && std::is_integral<iType1>::value &&
       std::is_integral<iType2>::value && std::is_integral<iType3>::value),
      reference_type>::type
  operator()(const iType0& i0, const iType1& i1, const iType2& i2,
             const iType3& i3) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (4, this->rank(), m_track, m_map, i0, i1, i2, i3))
    return m_map.reference(i0, i1, i2, i3);
  }

  template <typename iType0, typename iType1, typename iType2, typename iType3>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      !(std::is_same<typename drvtraits::specialize, void>::value &&
        std::is_integral<iType0>::value),
      reference_type>::type
  operator()(const iType0& i0, const iType1& i1, const iType2& i2,
             const iType3& i3) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (4, this->rank(), m_track, m_map, i0, i1, i2, i3))
    return m_map.reference(i0, i1, i2, i3, 0, 0, 0);
  }

  // Rank 5
  template <typename iType0, typename iType1, typename iType2, typename iType3,
            typename iType4>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      (std::is_same<typename traits::specialize, void>::value &&
       std::is_integral<iType0>::value && std::is_integral<iType1>::value &&
       std::is_integral<iType2>::value && std::is_integral<iType3>::value &&
       std::is_integral<iType4>::value),
      reference_type>::type
  operator()(const iType0& i0, const iType1& i1, const iType2& i2,
             const iType3& i3, const iType4& i4) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (5, this->rank(), m_track, m_map, i0, i1, i2, i3, i4))
    return m_map.reference(i0, i1, i2, i3, i4);
  }

  template <typename iType0, typename iType1, typename iType2, typename iType3,
            typename iType4>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      !(std::is_same<typename drvtraits::specialize, void>::value &&
        std::is_integral<iType0>::value),
      reference_type>::type
  operator()(const iType0& i0, const iType1& i1, const iType2& i2,
             const iType3& i3, const iType4& i4) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (5, this->rank(), m_track, m_map, i0, i1, i2, i3, i4))
    return m_map.reference(i0, i1, i2, i3, i4, 0, 0);
  }

  // Rank 6
  template <typename iType0, typename iType1, typename iType2, typename iType3,
            typename iType4, typename iType5>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      (std::is_same<typename traits::specialize, void>::value &&
       std::is_integral<iType0>::value && std::is_integral<iType1>::value &&
       std::is_integral<iType2>::value && std::is_integral<iType3>::value &&
       std::is_integral<iType4>::value && std::is_integral<iType5>::value),
      reference_type>::type
  operator()(const iType0& i0, const iType1& i1, const iType2& i2,
             const iType3& i3, const iType4& i4, const iType5& i5) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (6, this->rank(), m_track, m_map, i0, i1, i2, i3, i4, i5))
    return m_map.reference(i0, i1, i2, i3, i4, i5);
  }

  template <typename iType0, typename iType1, typename iType2, typename iType3,
            typename iType4, typename iType5>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      !(std::is_same<typename drvtraits::specialize, void>::value &&
        std::is_integral<iType0>::value),
      reference_type>::type
  operator()(const iType0& i0, const iType1& i1, const iType2& i2,
             const iType3& i3, const iType4& i4, const iType5& i5) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (6, this->rank(), m_track, m_map, i0, i1, i2, i3, i4, i5))
    return m_map.reference(i0, i1, i2, i3, i4, i5, 0);
  }

  // Rank 7
  template <typename iType0, typename iType1, typename iType2, typename iType3,
            typename iType4, typename iType5, typename iType6>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      (std::is_integral<iType0>::value && std::is_integral<iType1>::value &&
       std::is_integral<iType2>::value && std::is_integral<iType3>::value &&
       std::is_integral<iType4>::value && std::is_integral<iType5>::value &&
       std::is_integral<iType6>::value),
      reference_type>::type
  operator()(const iType0& i0, const iType1& i1, const iType2& i2,
             const iType3& i3, const iType4& i4, const iType5& i5,
             const iType6& i6) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (7, this->rank(), m_track, m_map, i0, i1, i2, i3, i4, i5, i6))
    return m_map.reference(i0, i1, i2, i3, i4, i5, i6);
  }

  // Rank 0
  KOKKOS_INLINE_FUNCTION
  reference_type access() const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY((0, this->rank(), m_track, m_map))
    return impl_map().reference();
    // return m_map.reference(0,0,0,0,0,0,0);
  }

  // Rank 1
  // Rank 1 parenthesis
  template <typename iType>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      (std::is_same<typename traits::specialize, void>::value &&
       std::is_integral<iType>::value),
      reference_type>::type
  access(const iType& i0) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY((1, this->rank(), m_track, m_map, i0))
    return m_map.reference(i0);
  }

  template <typename iType>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      !(std::is_same<typename traits::specialize, void>::value &&
        std::is_integral<iType>::value),
      reference_type>::type
  access(const iType& i0) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY((1, this->rank(), m_track, m_map, i0))
    return m_map.reference(i0, 0, 0, 0, 0, 0, 0);
  }

  // Rank 2
  template <typename iType0, typename iType1>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      (std::is_same<typename traits::specialize, void>::value &&
       std::is_integral<iType0>::value && std::is_integral<iType1>::value),
      reference_type>::type
  access(const iType0& i0, const iType1& i1) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY((2, this->rank(), m_track, m_map, i0, i1))
    return m_map.reference(i0, i1);
  }

  template <typename iType0, typename iType1>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      !(std::is_same<typename drvtraits::specialize, void>::value &&
        std::is_integral<iType0>::value),
      reference_type>::type
  access(const iType0& i0, const iType1& i1) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY((2, this->rank(), m_track, m_map, i0, i1))
    return m_map.reference(i0, i1, 0, 0, 0, 0, 0);
  }

  // Rank 3
  template <typename iType0, typename iType1, typename iType2>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      (std::is_same<typename traits::specialize, void>::value &&
       std::is_integral<iType0>::value && std::is_integral<iType1>::value &&
       std::is_integral<iType2>::value),
      reference_type>::type
  access(const iType0& i0, const iType1& i1, const iType2& i2) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (3, this->rank(), m_track, m_map, i0, i1, i2))
    return m_map.reference(i0, i1, i2);
  }

  template <typename iType0, typename iType1, typename iType2>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      !(std::is_same<typename drvtraits::specialize, void>::value &&
        std::is_integral<iType0>::value),
      reference_type>::type
  access(const iType0& i0, const iType1& i1, const iType2& i2) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (3, this->rank(), m_track, m_map, i0, i1, i2))
    return m_map.reference(i0, i1, i2, 0, 0, 0, 0);
  }

  // Rank 4
  template <typename iType0, typename iType1, typename iType2, typename iType3>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      (std::is_same<typename traits::specialize, void>::value &&
       std::is_integral<iType0>::value && std::is_integral<iType1>::value &&
       std::is_integral<iType2>::value && std::is_integral<iType3>::value),
      reference_type>::type
  access(const iType0& i0, const iType1& i1, const iType2& i2,
         const iType3& i3) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (4, this->rank(), m_track, m_map, i0, i1, i2, i3))
    return m_map.reference(i0, i1, i2, i3);
  }

  template <typename iType0, typename iType1, typename iType2, typename iType3>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      !(std::is_same<typename drvtraits::specialize, void>::value &&
        std::is_integral<iType0>::value),
      reference_type>::type
  access(const iType0& i0, const iType1& i1, const iType2& i2,
         const iType3& i3) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (4, this->rank(), m_track, m_map, i0, i1, i2, i3))
    return m_map.reference(i0, i1, i2, i3, 0, 0, 0);
  }

  // Rank 5
  template <typename iType0, typename iType1, typename iType2, typename iType3,
            typename iType4>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      (std::is_same<typename traits::specialize, void>::value &&
       std::is_integral<iType0>::value && std::is_integral<iType1>::value &&
       std::is_integral<iType2>::value && std::is_integral<iType3>::value &&
       std::is_integral<iType4>::value),
      reference_type>::type
  access(const iType0& i0, const iType1& i1, const iType2& i2, const iType3& i3,
         const iType4& i4) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (5, this->rank(), m_track, m_map, i0, i1, i2, i3, i4))
    return m_map.reference(i0, i1, i2, i3, i4);
  }

  template <typename iType0, typename iType1, typename iType2, typename iType3,
            typename iType4>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      !(std::is_same<typename drvtraits::specialize, void>::value &&
        std::is_integral<iType0>::value),
      reference_type>::type
  access(const iType0& i0, const iType1& i1, const iType2& i2, const iType3& i3,
         const iType4& i4) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (5, this->rank(), m_track, m_map, i0, i1, i2, i3, i4))
    return m_map.reference(i0, i1, i2, i3, i4, 0, 0);
  }

  // Rank 6
  template <typename iType0, typename iType1, typename iType2, typename iType3,
            typename iType4, typename iType5>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      (std::is_same<typename traits::specialize, void>::value &&
       std::is_integral<iType0>::value && std::is_integral<iType1>::value &&
       std::is_integral<iType2>::value && std::is_integral<iType3>::value &&
       std::is_integral<iType4>::value && std::is_integral<iType5>::value),
      reference_type>::type
  access(const iType0& i0, const iType1& i1, const iType2& i2, const iType3& i3,
         const iType4& i4, const iType5& i5) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (6, this->rank(), m_track, m_map, i0, i1, i2, i3, i4, i5))
    return m_map.reference(i0, i1, i2, i3, i4, i5);
  }

  template <typename iType0, typename iType1, typename iType2, typename iType3,
            typename iType4, typename iType5>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      !(std::is_same<typename drvtraits::specialize, void>::value &&
        std::is_integral<iType0>::value),
      reference_type>::type
  access(const iType0& i0, const iType1& i1, const iType2& i2, const iType3& i3,
         const iType4& i4, const iType5& i5) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (6, this->rank(), m_track, m_map, i0, i1, i2, i3, i4, i5))
    return m_map.reference(i0, i1, i2, i3, i4, i5, 0);
  }

  // Rank 7
  template <typename iType0, typename iType1, typename iType2, typename iType3,
            typename iType4, typename iType5, typename iType6>
  KOKKOS_INLINE_FUNCTION typename std::enable_if<
      (std::is_integral<iType0>::value && std::is_integral<iType1>::value &&
       std::is_integral<iType2>::value && std::is_integral<iType3>::value &&
       std::is_integral<iType4>::value && std::is_integral<iType5>::value &&
       std::is_integral<iType6>::value),
      reference_type>::type
  access(const iType0& i0, const iType1& i1, const iType2& i2, const iType3& i3,
         const iType4& i4, const iType5& i5, const iType6& i6) const {
    KOKKOS_IMPL_VIEW_OPERATOR_VERIFY(
        (7, this->rank(), m_track, m_map, i0, i1, i2, i3, i4, i5, i6))
    return m_map.reference(i0, i1, i2, i3, i4, i5, i6);
  }

#undef KOKKOS_IMPL_VIEW_OPERATOR_VERIFY

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

  KOKKOS_DEFAULTED_FUNCTION
  ~DynRankView() = default;

  KOKKOS_INLINE_FUNCTION
  DynRankView() : m_track(), m_map(), m_rank() {}  // Default ctor

  KOKKOS_INLINE_FUNCTION
  DynRankView(const DynRankView& rhs)
      : m_track(rhs.m_track), m_map(rhs.m_map), m_rank(rhs.m_rank) {}

  KOKKOS_INLINE_FUNCTION
  DynRankView(DynRankView&& rhs)
      : m_track(rhs.m_track), m_map(rhs.m_map), m_rank(rhs.m_rank) {}

  KOKKOS_INLINE_FUNCTION
  DynRankView& operator=(const DynRankView& rhs) {
    m_track = rhs.m_track;
    m_map   = rhs.m_map;
    m_rank  = rhs.m_rank;
    return *this;
  }

  KOKKOS_INLINE_FUNCTION
  DynRankView& operator=(DynRankView&& rhs) {
    m_track = rhs.m_track;
    m_map   = rhs.m_map;
    m_rank  = rhs.m_rank;
    return *this;
  }

  //----------------------------------------
  // Compatible view copy constructor and assignment
  // may assign unmanaged from managed.
  template <class RT, class... RP>
  KOKKOS_INLINE_FUNCTION DynRankView(const DynRankView<RT, RP...>& rhs)
      : m_track(rhs.m_track, traits::is_managed), m_map(), m_rank(rhs.m_rank) {
    typedef typename DynRankView<RT, RP...>::traits SrcTraits;
    typedef Kokkos::Impl::ViewMapping<traits, SrcTraits,
                                      typename traits::specialize>
        Mapping;
    static_assert(Mapping::is_assignable,
                  "Incompatible DynRankView copy construction");
    Mapping::assign(m_map, rhs.m_map, rhs.m_track);
  }

  template <class RT, class... RP>
  KOKKOS_INLINE_FUNCTION DynRankView& operator=(
      const DynRankView<RT, RP...>& rhs) {
    typedef typename DynRankView<RT, RP...>::traits SrcTraits;
    typedef Kokkos::Impl::ViewMapping<traits, SrcTraits,
                                      typename traits::specialize>
        Mapping;
    static_assert(Mapping::is_assignable,
                  "Incompatible DynRankView copy construction");
    Mapping::assign(m_map, rhs.m_map, rhs.m_track);
    m_track.assign(rhs.m_track, traits::is_managed);
    m_rank = rhs.rank();
    return *this;
  }

  // Copy/Assign View to DynRankView
  template <class RT, class... RP>
  KOKKOS_INLINE_FUNCTION DynRankView(const View<RT, RP...>& rhs)
      : m_track(), m_map(), m_rank(rhs.Rank) {
    typedef typename View<RT, RP...>::traits SrcTraits;
    typedef Kokkos::Impl::ViewMapping<traits, SrcTraits,
                                      Kokkos::Impl::ViewToDynRankViewTag>
        Mapping;
    static_assert(Mapping::is_assignable,
                  "Incompatible View to DynRankView copy construction");
    Mapping::assign(*this, rhs);
  }

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

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

  KOKKOS_INLINE_FUNCTION
  int use_count() const { return m_track.use_count(); }

  inline const std::string label() const {
    return m_track.template get_label<typename traits::memory_space>();
  }

  //----------------------------------------
  // 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
  template <class... P>
  explicit inline DynRankView(
      const Kokkos::Impl::ViewCtorProp<P...>& arg_prop,
      typename std::enable_if<!Kokkos::Impl::ViewCtorProp<P...>::has_pointer,
                              typename traits::array_layout>::type const&
          arg_layout)
      : m_track(),
        m_map(),
        m_rank(Impl::DynRankDimTraits<typename traits::specialize>::
                   template computeRank<typename traits::array_layout, P...>(
                       arg_prop, arg_layout)) {
    // Append layout and spaces if not input
    typedef Kokkos::Impl::ViewCtorProp<P...> alloc_prop_input;

    // use 'std::integral_constant<unsigned,I>' for non-types
    // to avoid duplicate class error.
    typedef Kokkos::Impl::ViewCtorProp<
        P...,
        typename std::conditional<alloc_prop_input::has_label,
                                  std::integral_constant<unsigned, 0>,
                                  typename std::string>::type,
        typename std::conditional<
            alloc_prop_input::has_memory_space,
            std::integral_constant<unsigned, 1>,
            typename traits::device_type::memory_space>::type,
        typename std::conditional<
            alloc_prop_input::has_execution_space,
            std::integral_constant<unsigned, 2>,
            typename traits::device_type::execution_space>::type>
        alloc_prop;

    static_assert(traits::is_managed,
                  "View allocation constructor requires managed memory");

    if (alloc_prop::initialize &&
#ifdef KOKKOS_ENABLE_DEPRECATED_CODE
        !alloc_prop::execution_space::is_initialized()
#else
        !alloc_prop::execution_space::impl_is_initialized()
#endif
    ) {
      // If initializing view data then
      // the execution space must be initialized.
      Kokkos::Impl::throw_runtime_exception(
          "Constructing DynRankView and initializing data with uninitialized "
          "execution space");
    }

    // Copy the input allocation properties with possibly defaulted properties
    alloc_prop prop_copy(arg_prop);

//------------------------------------------------------------
#if defined(KOKKOS_ENABLE_CUDA)
    // If allocating in CudaUVMSpace must fence before and after
    // the allocation to protect against possible concurrent access
    // on the CPU and the GPU.
    // Fence using the trait's executon space (which will be Kokkos::Cuda)
    // to avoid incomplete type errors from usng Kokkos::Cuda directly.
    if (std::is_same<Kokkos::CudaUVMSpace,
                     typename traits::device_type::memory_space>::value) {
      typename traits::device_type::memory_space::execution_space().fence();
    }
#endif
    //------------------------------------------------------------

    Kokkos::Impl::SharedAllocationRecord<>* record = m_map.allocate_shared(
        prop_copy,
        Impl::DynRankDimTraits<typename traits::specialize>::
            template createLayout<traits, P...>(arg_prop, arg_layout));

//------------------------------------------------------------
#if defined(KOKKOS_ENABLE_CUDA)
    if (std::is_same<Kokkos::CudaUVMSpace,
                     typename traits::device_type::memory_space>::value) {
      typename traits::device_type::memory_space::execution_space().fence();
    }
#endif
    //------------------------------------------------------------

    // Setup and initialization complete, start tracking
    m_track.assign_allocated_record_to_uninitialized(record);
  }

  // Wrappers
  template <class... P>
  explicit KOKKOS_INLINE_FUNCTION DynRankView(
      const Kokkos::Impl::ViewCtorProp<P...>& arg_prop,
      typename std::enable_if<Kokkos::Impl::ViewCtorProp<P...>::has_pointer,
                              typename traits::array_layout>::type const&
          arg_layout)
      : m_track()  // No memory tracking
        ,
        m_map(arg_prop,
              Impl::DynRankDimTraits<typename traits::specialize>::
                  template createLayout<traits, P...>(arg_prop, arg_layout)),
        m_rank(Impl::DynRankDimTraits<typename traits::specialize>::
                   template computeRank<typename traits::array_layout, P...>(
                       arg_prop, arg_layout)) {
    static_assert(
        std::is_same<pointer_type,
                     typename Impl::ViewCtorProp<P...>::pointer_type>::value,
        "Constructing DynRankView to wrap user memory must supply matching "
        "pointer type");
  }

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

  // Simple dimension-only layout
  template <class... P>
  explicit inline DynRankView(
      const Kokkos::Impl::ViewCtorProp<P...>& arg_prop,
      typename std::enable_if<!Kokkos::Impl::ViewCtorProp<P...>::has_pointer,
                              size_t>::type const 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 KOKKOS_INLINE_FUNCTION DynRankView(
      const Kokkos::Impl::ViewCtorProp<P...>& arg_prop,
      typename std::enable_if<Kokkos::Impl::ViewCtorProp<P...>::has_pointer,
                              size_t>::type const 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,
      typename std::enable_if<Kokkos::Impl::is_view_label<Label>::value,
                              typename traits::array_layout>::type 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,
      typename std::enable_if<Kokkos::Impl::is_view_label<Label>::value,
                              const size_t>::type 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)) {}

  // For backward compatibility
  // NDE This ctor does not take ViewCtorProp argument - should not use
  // alternative createLayout call
  explicit inline DynRankView(const ViewAllocateWithoutInitializing& arg_prop,
                              const typename traits::array_layout& arg_layout)
      : DynRankView(
            Kokkos::Impl::ViewCtorProp<std::string,
                                       Kokkos::Impl::WithoutInitializing_t>(
                arg_prop.label, Kokkos::WithoutInitializing),
            arg_layout) {}

  explicit inline DynRankView(const ViewAllocateWithoutInitializing& arg_prop,
                              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,
                                       Kokkos::Impl::WithoutInitializing_t>(
                arg_prop.label, Kokkos::WithoutInitializing),
            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.
  static constexpr size_t required_allocation_size(
      const size_t arg_N0 = 0, const size_t arg_N1 = 0, const size_t arg_N2 = 0,
      const size_t arg_N3 = 0, const size_t arg_N4 = 0, const size_t arg_N5 = 0,
      const size_t arg_N6 = 0, const size_t arg_N7 = 0) {
    return map_type::memory_span(typename traits::array_layout(
        arg_N0, arg_N1, arg_N2, arg_N3, arg_N4, arg_N5, arg_N6, arg_N7));
  }

  explicit KOKKOS_INLINE_FUNCTION DynRankView(
      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<pointer_type>(arg_ptr), arg_N0,
                    arg_N1, arg_N2, arg_N3, arg_N4, arg_N5, arg_N6, arg_N7) {}

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

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

  static inline size_t shmem_size(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) {
    const size_t num_passed_args =
        (arg_N0 != KOKKOS_INVALID_INDEX) + (arg_N1 != KOKKOS_INVALID_INDEX) +
        (arg_N2 != KOKKOS_INVALID_INDEX) + (arg_N3 != KOKKOS_INVALID_INDEX) +
        (arg_N4 != KOKKOS_INVALID_INDEX) + (arg_N5 != KOKKOS_INVALID_INDEX) +
        (arg_N6 != KOKKOS_INVALID_INDEX) + (arg_N7 != KOKKOS_INVALID_INDEX);

    if (std::is_same<typename traits::specialize, void>::value &&
        num_passed_args != traits::rank_dynamic) {
      Kokkos::abort(
          "Kokkos::View::shmem_size() rank_dynamic != number of arguments.\n");
    }
    {}

    return map_type::memory_span(typename traits::array_layout(
        arg_N0, arg_N1, arg_N2, arg_N3, arg_N4, arg_N5, arg_N6, arg_N7));
  }

  explicit KOKKOS_INLINE_FUNCTION DynRankView(
      const typename traits::execution_space::scratch_memory_space& arg_space,
      const typename traits::array_layout& arg_layout)
      : DynRankView(
            Kokkos::Impl::ViewCtorProp<pointer_type>(
                reinterpret_cast<pointer_type>(
                    arg_space.get_shmem(map_type::memory_span(
                        Impl::DynRankDimTraits<typename traits::specialize>::
                            createLayout(arg_layout)  // is this correct?
                        )))),
            arg_layout) {}

  explicit KOKKOS_INLINE_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(
            Kokkos::Impl::ViewCtorProp<pointer_type>(
                reinterpret_cast<pointer_type>(
                    arg_space.get_shmem(map_type::memory_span(
                        Impl::DynRankDimTraits<typename traits::specialize>::
                            createLayout(typename traits::array_layout(
                                arg_N0, arg_N1, arg_N2, arg_N3, arg_N4, arg_N5,
                                arg_N6, arg_N7)))))),
            typename traits::array_layout(arg_N0, arg_N1, arg_N2, arg_N3,
                                          arg_N4, arg_N5, arg_N6, arg_N7)) {}
};

template <typename D, class... P>
KOKKOS_INLINE_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

namespace Impl {

template <class SrcTraits, class... Args>
struct ViewMapping<
    typename std::enable_if<
        (std::is_same<typename SrcTraits::specialize, void>::value &&
         (std::is_same<typename SrcTraits::array_layout,
                       Kokkos::LayoutLeft>::value ||
          std::is_same<typename SrcTraits::array_layout,
                       Kokkos::LayoutRight>::value ||
          std::is_same<typename SrcTraits::array_layout,
                       Kokkos::LayoutStride>::value)),
        Kokkos::Impl::DynRankSubviewTag>::type,
    SrcTraits, Args...> {
 private:
  enum {
    RZ = false,
    R0 = bool(is_integral_extent<0, Args...>::value),
    R1 = bool(is_integral_extent<1, Args...>::value),
    R2 = bool(is_integral_extent<2, Args...>::value),
    R3 = bool(is_integral_extent<3, Args...>::value),
    R4 = bool(is_integral_extent<4, Args...>::value),
    R5 = bool(is_integral_extent<5, Args...>::value),
    R6 = bool(is_integral_extent<6, Args...>::value)
  };

  enum {
    rank = unsigned(R0) + unsigned(R1) + unsigned(R2) + unsigned(R3) +
           unsigned(R4) + unsigned(R5) + unsigned(R6)
  };

  typedef Kokkos::LayoutStride array_layout;

  typedef typename SrcTraits::value_type value_type;

  typedef value_type******* data_type;

 public:
  typedef Kokkos::ViewTraits<data_type, array_layout,
                             typename SrcTraits::device_type,
                             typename SrcTraits::memory_traits>
      traits_type;

  typedef Kokkos::View<data_type, array_layout, typename SrcTraits::device_type,
                       typename SrcTraits::memory_traits>
      type;

  template <class MemoryTraits>
  struct apply {
    static_assert(Kokkos::Impl::is_memory_traits<MemoryTraits>::value, "");

    typedef Kokkos::ViewTraits<data_type, array_layout,
                               typename SrcTraits::device_type, MemoryTraits>
        traits_type;

    typedef Kokkos::View<data_type, array_layout,
                         typename SrcTraits::device_type, MemoryTraits>
        type;
  };

  typedef typename SrcTraits::dimension dimension;

  template <class Arg0 = int, class Arg1 = int, class Arg2 = int,
            class Arg3 = int, class Arg4 = int, class Arg5 = int,
            class Arg6 = int>
  struct ExtentGenerator {
    KOKKOS_INLINE_FUNCTION
    static SubviewExtents<7, rank> generator(
        const dimension& dim, Arg0 arg0 = Arg0(), Arg1 arg1 = Arg1(),
        Arg2 arg2 = Arg2(), Arg3 arg3 = Arg3(), Arg4 arg4 = Arg4(),
        Arg5 arg5 = Arg5(), Arg6 arg6 = Arg6()) {
      return SubviewExtents<7, rank>(dim, arg0, arg1, arg2, arg3, arg4, arg5,
                                     arg6);
    }
  };

  typedef Kokkos::DynRankView<value_type, array_layout,
                              typename SrcTraits::device_type,
                              typename SrcTraits::memory_traits>
      ret_type;

  template <typename T, class... P>
  KOKKOS_INLINE_FUNCTION static ret_type subview(
      const unsigned src_rank, Kokkos::DynRankView<T, P...> const& src,
      Args... args) {
    typedef ViewMapping<traits_type, typename traits_type::specialize> DstType;

    typedef typename std::conditional<
        (rank == 0), ViewDimension<>,
        typename std::conditional<
            (rank == 1), ViewDimension<0>,
            typename std::conditional<
                (rank == 2), ViewDimension<0, 0>,
                typename std::conditional<
                    (rank == 3), ViewDimension<0, 0, 0>,
                    typename std::conditional<
                        (rank == 4), ViewDimension<0, 0, 0, 0>,
                        typename std::conditional<
                            (rank == 5), ViewDimension<0, 0, 0, 0, 0>,
                            typename std::conditional<
                                (rank == 6), ViewDimension<0, 0, 0, 0, 0, 0>,
                                ViewDimension<0, 0, 0, 0, 0, 0, 0> >::type>::
                            type>::type>::type>::type>::type>::type DstDimType;

    typedef ViewOffset<DstDimType, Kokkos::LayoutStride> dst_offset_type;
    typedef typename DstType::handle_type dst_handle_type;

    ret_type dst;

    const SubviewExtents<7, rank> extents = ExtentGenerator<Args...>::generator(
        src.m_map.m_impl_offset.m_dim, args...);

    dst_offset_type tempdst(src.m_map.m_impl_offset, extents);

    dst.m_track = src.m_track;

    dst.m_map.m_impl_offset.m_dim.N0 = tempdst.m_dim.N0;
    dst.m_map.m_impl_offset.m_dim.N1 = tempdst.m_dim.N1;
    dst.m_map.m_impl_offset.m_dim.N2 = tempdst.m_dim.N2;
    dst.m_map.m_impl_offset.m_dim.N3 = tempdst.m_dim.N3;
    dst.m_map.m_impl_offset.m_dim.N4 = tempdst.m_dim.N4;
    dst.m_map.m_impl_offset.m_dim.N5 = tempdst.m_dim.N5;
    dst.m_map.m_impl_offset.m_dim.N6 = tempdst.m_dim.N6;

    dst.m_map.m_impl_offset.m_stride.S0 = tempdst.m_stride.S0;
    dst.m_map.m_impl_offset.m_stride.S1 = tempdst.m_stride.S1;
    dst.m_map.m_impl_offset.m_stride.S2 = tempdst.m_stride.S2;
    dst.m_map.m_impl_offset.m_stride.S3 = tempdst.m_stride.S3;
    dst.m_map.m_impl_offset.m_stride.S4 = tempdst.m_stride.S4;
    dst.m_map.m_impl_offset.m_stride.S5 = tempdst.m_stride.S5;
    dst.m_map.m_impl_offset.m_stride.S6 = tempdst.m_stride.S6;

    dst.m_map.m_impl_handle =
        dst_handle_type(src.m_map.m_impl_handle +
                        src.m_map.m_impl_offset(
                            extents.domain_offset(0), extents.domain_offset(1),
                            extents.domain_offset(2), extents.domain_offset(3),
                            extents.domain_offset(4), extents.domain_offset(5),
                            extents.domain_offset(6)));

    dst.m_rank =
        (src_rank > 0 ? unsigned(R0) : 0) + (src_rank > 1 ? unsigned(R1) : 0) +
        (src_rank > 2 ? unsigned(R2) : 0) + (src_rank > 3 ? unsigned(R3) : 0) +
        (src_rank > 4 ? unsigned(R4) : 0) + (src_rank > 5 ? unsigned(R5) : 0) +
        (src_rank > 6 ? unsigned(R6) : 0);

    return dst;
  }
};

}  // namespace Impl

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

template <class D, class... P, class... Args>
KOKKOS_INLINE_FUNCTION Subdynrankview<ViewTraits<D*******, P...>, Args...>
subdynrankview(const Kokkos::DynRankView<D, P...>& src, Args... args) {
  if (src.rank() > sizeof...(Args))  // allow sizeof...(Args) >= src.rank(),
                                     // ignore the remaining args
  {
    Kokkos::abort(
        "subdynrankview: num of args must be >= rank of the source "
        "DynRankView");
  }

  typedef Kokkos::Impl::ViewMapping<Kokkos::Impl::DynRankSubviewTag,
                                    Kokkos::ViewTraits<D*******, P...>, Args...>
      metafcn;

  return metafcn::subview(src.rank(), src, args...);
}

// Wrapper to allow subview function name
template <class D, class... P, class... Args>
KOKKOS_INLINE_FUNCTION Subdynrankview<ViewTraits<D*******, P...>, Args...>
subview(const Kokkos::DynRankView<D, P...>& src, Args... args) {
  return subdynrankview(src, args...);
}

}  // 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
  typedef ViewTraits<LT, LP...> lhs_traits;
  typedef ViewTraits<RT, RP...> rhs_traits;

  return std::is_same<typename lhs_traits::const_value_type,
                      typename rhs_traits::const_value_type>::value &&
         std::is_same<typename lhs_traits::array_layout,
                      typename rhs_traits::array_layout>::value &&
         std::is_same<typename lhs_traits::memory_space,
                      typename rhs_traits::memory_space>::value &&
         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, typename Enable = void>
struct DynRankViewFill {
  typedef typename OutputView::traits::const_value_type const_value_type;

  const OutputView output;
  const_value_type input;

  KOKKOS_INLINE_FUNCTION
  void operator()(const size_t i0) const {
    const size_t n1 = output.extent(1);
    const size_t n2 = output.extent(2);
    const size_t n3 = output.extent(3);
    const size_t n4 = output.extent(4);
    const size_t n5 = output.extent(5);
    const size_t n6 = output.extent(6);

    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;
              }
            }
          }
        }
      }
    }
  }

  DynRankViewFill(const OutputView& arg_out, const_value_type& arg_in)
      : output(arg_out), input(arg_in) {
    typedef typename OutputView::execution_space execution_space;
    typedef Kokkos::RangePolicy<execution_space> Policy;

    const Kokkos::Impl::ParallelFor<DynRankViewFill, Policy> closure(
        *this, Policy(0, output.extent(0)));

    closure.execute();

    execution_space().fence();
  }
};

template <class OutputView>
struct DynRankViewFill<OutputView,
                       typename std::enable_if<OutputView::Rank == 0>::type> {
  DynRankViewFill(const OutputView& dst,
                  const typename OutputView::const_value_type& src) {
    Kokkos::Impl::DeepCopy<typename OutputView::memory_space,
                           Kokkos::HostSpace>(
        dst.data(), &src, sizeof(typename OutputView::const_value_type));
  }
};

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 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))) {
    typedef Kokkos::RangePolicy<ExecSpace> Policy;
    const Kokkos::Impl::ParallelFor<DynRankViewRemap, Policy> closure(
        *this, Policy(0, n0));
    closure.execute();
    // ExecSpace().fence(); // ??
  }

  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 {

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

  Kokkos::Impl::DynRankViewFill<DynRankView<DT, DP...> >(dst, value);
}

/** \brief  Deep copy into a value in Host memory from a view.  */
template <class ST, class... SP>
inline void deep_copy(
    typename ViewTraits<ST, SP...>::non_const_value_type& dst,
    const DynRankView<ST, SP...>& src,
    typename std::enable_if<std::is_same<
        typename ViewTraits<ST, SP...>::specialize, void>::value>::type* = 0) {
  if (src.rank() != 0) {
    Kokkos::abort("");
  }

  typedef ViewTraits<ST, SP...> src_traits;
  typedef typename src_traits::memory_space src_memory_space;
  Kokkos::Impl::DeepCopy<HostSpace, src_memory_space>(&dst, src.data(),
                                                      sizeof(ST));
}

//----------------------------------------------------------------------------
/** \brief  A deep copy between views of the default specialization, compatible
 * type, same rank, same contiguous layout.
 */
template <class DstType, class SrcType>
inline void deep_copy(
    const DstType& dst, const SrcType& src,
    typename std::enable_if<
        (std::is_same<typename DstType::traits::specialize, void>::value &&
         std::is_same<typename SrcType::traits::specialize, void>::value &&
         (Kokkos::is_dyn_rank_view<DstType>::value ||
          Kokkos::is_dyn_rank_view<SrcType>::value))>::type* = nullptr) {
  static_assert(
      std::is_same<typename DstType::traits::value_type,
                   typename DstType::traits::non_const_value_type>::value,
      "deep_copy requires non-const destination type");

  typedef DstType dst_type;
  typedef SrcType src_type;

  typedef typename dst_type::execution_space dst_execution_space;
  typedef typename src_type::execution_space src_execution_space;
  typedef typename dst_type::memory_space dst_memory_space;
  typedef typename src_type::memory_space src_memory_space;

  enum {
    DstExecCanAccessSrc =
        Kokkos::Impl::SpaceAccessibility<dst_execution_space,
                                         src_memory_space>::accessible
  };

  enum {
    SrcExecCanAccessDst =
        Kokkos::Impl::SpaceAccessibility<src_execution_space,
                                         dst_memory_space>::accessible
  };

  if ((void*)dst.data() != (void*)src.data()) {
    // Concern: If overlapping views then a parallel copy will be erroneous.
    // ...

    // If same type, equal layout, equal dimensions, equal span, and contiguous
    // memory then can byte-wise copy
    if (rank(src) == 0 && rank(dst) == 0) {
      typedef typename dst_type::value_type value_type;
      Kokkos::Impl::DeepCopy<dst_memory_space, src_memory_space>(
          dst.data(), src.data(), sizeof(value_type));
    } else if (std::is_same<
                   typename DstType::traits::value_type,
                   typename SrcType::traits::non_const_value_type>::value &&
               ((std::is_same<typename DstType::traits::array_layout,
                              typename SrcType::traits::array_layout>::value &&
                 (std::is_same<typename DstType::traits::array_layout,
                               typename Kokkos::LayoutLeft>::value ||
                  std::is_same<typename DstType::traits::array_layout,
                               typename Kokkos::LayoutRight>::value)) ||
                (rank(dst) == 1 && rank(src) == 1)) &&
               dst.span_is_contiguous() && src.span_is_contiguous() &&
               dst.span() == src.span() && dst.extent(0) == src.extent(0) &&

               dst.extent(1) == src.extent(1) &&
               dst.extent(2) == src.extent(2) &&
               dst.extent(3) == src.extent(3) &&
               dst.extent(4) == src.extent(4) &&
               dst.extent(5) == src.extent(5) &&
               dst.extent(6) == src.extent(6) &&
               dst.extent(7) == src.extent(7)) {
      const size_t nbytes = sizeof(typename dst_type::value_type) * dst.span();

      Kokkos::Impl::DeepCopy<dst_memory_space, src_memory_space>(
          dst.data(), src.data(), nbytes);
    } else if (std::is_same<
                   typename DstType::traits::value_type,
                   typename SrcType::traits::non_const_value_type>::value &&
               ((std::is_same<typename DstType::traits::array_layout,
                              typename SrcType::traits::array_layout>::value &&
                 std::is_same<typename DstType::traits::array_layout,
                              typename Kokkos::LayoutStride>::value) ||
                (rank(dst) == 1 && rank(src) == 1)) &&
               dst.span_is_contiguous() && src.span_is_contiguous() &&
               dst.span() == src.span() && dst.extent(0) == src.extent(0) &&
               dst.extent(1) == src.extent(1) &&
               dst.extent(2) == src.extent(2) &&
               dst.extent(3) == src.extent(3) &&
               dst.extent(4) == src.extent(4) &&
               dst.extent(5) == src.extent(5) &&
               dst.extent(6) == src.extent(6) &&
               dst.extent(7) == src.extent(7) &&
               dst.stride_0() == src.stride_0() &&
               dst.stride_1() == src.stride_1() &&
               dst.stride_2() == src.stride_2() &&
               dst.stride_3() == src.stride_3() &&
               dst.stride_4() == src.stride_4() &&
               dst.stride_5() == src.stride_5() &&
               dst.stride_6() == src.stride_6() &&
               dst.stride_7() == src.stride_7()) {
      const size_t nbytes = sizeof(typename dst_type::value_type) * dst.span();

      Kokkos::Impl::DeepCopy<dst_memory_space, src_memory_space>(
          dst.data(), src.data(), nbytes);
    } else if (DstExecCanAccessSrc) {
      // Copying data between views in accessible memory spaces and either
      // non-contiguous or incompatible shape.
      Kokkos::Impl::DynRankViewRemap<dst_type, src_type>(dst, src);
    } else if (SrcExecCanAccessDst) {
      // Copying data between views in accessible memory spaces and either
      // non-contiguous or incompatible shape.
      Kokkos::Impl::DynRankViewRemap<dst_type, src_type, src_execution_space>(
          dst, src);
    } else {
      Kokkos::Impl::throw_runtime_exception(
          "deep_copy given views that would require a temporary allocation");
    }
  }
}

}  // namespace Kokkos

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

namespace Kokkos {
namespace Impl {

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

template <class Space, class T, class... P>
struct MirrorDRVType {
  // The incoming view_type
  typedef typename Kokkos::DynRankView<T, P...> src_view_type;
  // The memory space for the mirror view
  typedef typename Space::memory_space memory_space;
  // Check whether it is the same memory space
  enum {
    is_same_memspace =
        std::is_same<memory_space, typename src_view_type::memory_space>::value
  };
  // The array_layout
  typedef typename src_view_type::array_layout array_layout;
  // The data type (we probably want it non-const since otherwise we can't even
  // deep_copy to it.
  typedef typename src_view_type::non_const_data_type data_type;
  // The destination view type if it is not the same memory space
  typedef Kokkos::DynRankView<data_type, array_layout, Space> view_type;
};

}  // namespace Impl

template <class T, class... P>
inline typename DynRankView<T, P...>::HostMirror create_mirror(
    const DynRankView<T, P...>& src,
    typename std::enable_if<
        std::is_same<typename ViewTraits<T, P...>::specialize, void>::value &&
        !std::is_same<typename Kokkos::ViewTraits<T, P...>::array_layout,
                      Kokkos::LayoutStride>::value>::type* = nullptr) {
  typedef DynRankView<T, P...> src_type;
  typedef typename src_type::HostMirror dst_type;

  return dst_type(std::string(src.label()).append("_mirror"),
                  Impl::reconstructLayout(src.layout(), src.rank()));
}

template <class T, class... P>
inline typename DynRankView<T, P...>::HostMirror create_mirror(
    const DynRankView<T, P...>& src,
    typename std::enable_if<
        std::is_same<typename ViewTraits<T, P...>::specialize, void>::value &&
        std::is_same<typename Kokkos::ViewTraits<T, P...>::array_layout,
                     Kokkos::LayoutStride>::value>::type* = 0) {
  typedef DynRankView<T, P...> src_type;
  typedef typename src_type::HostMirror dst_type;

  return dst_type(std::string(src.label()).append("_mirror"),
                  Impl::reconstructLayout(src.layout(), src.rank()));
}

// Create a mirror in a new space (specialization for different space)
template <class Space, class T, class... P>
typename Impl::MirrorDRVType<Space, T, P...>::view_type create_mirror(
    const Space&, const Kokkos::DynRankView<T, P...>& src,
    typename std::enable_if<std::is_same<
        typename ViewTraits<T, P...>::specialize, void>::value>::type* =
        nullptr) {
  return typename Impl::MirrorDRVType<Space, T, P...>::view_type(
      src.label(), Impl::reconstructLayout(src.layout(), src.rank()));
}

template <class T, class... P>
inline typename DynRankView<T, P...>::HostMirror create_mirror_view(
    const DynRankView<T, P...>& src,
    typename std::enable_if<
        (std::is_same<
             typename DynRankView<T, P...>::memory_space,
             typename DynRankView<T, P...>::HostMirror::memory_space>::value &&
         std::is_same<typename DynRankView<T, P...>::data_type,
                      typename DynRankView<T, P...>::HostMirror::data_type>::
             value)>::type* = nullptr) {
  return src;
}

template <class T, class... P>
inline typename DynRankView<T, P...>::HostMirror create_mirror_view(
    const DynRankView<T, P...>& src,
    typename std::enable_if<
        !(std::is_same<
              typename DynRankView<T, P...>::memory_space,
              typename DynRankView<T, P...>::HostMirror::memory_space>::value &&
          std::is_same<typename DynRankView<T, P...>::data_type,
                       typename DynRankView<T, P...>::HostMirror::data_type>::
              value)>::type* = 0) {
  return Kokkos::create_mirror(src);
}

// Create a mirror view in a new space (specialization for same space)
template <class Space, class T, class... P>
typename Impl::MirrorDRViewType<Space, T, P...>::view_type create_mirror_view(
    const Space&, const Kokkos::DynRankView<T, P...>& src,
    typename std::enable_if<
        Impl::MirrorDRViewType<Space, T, P...>::is_same_memspace>::type* =
        nullptr) {
  return src;
}

// Create a mirror view in a new space (specialization for different space)
template <class Space, class T, class... P>
typename Impl::MirrorDRViewType<Space, T, P...>::view_type create_mirror_view(
    const Space&, const Kokkos::DynRankView<T, P...>& src,
    typename std::enable_if<
        !Impl::MirrorDRViewType<Space, T, P...>::is_same_memspace>::type* = 0) {
  return typename Impl::MirrorDRViewType<Space, T, P...>::view_type(
      src.label(), Impl::reconstructLayout(src.layout(), src.rank()));
}

// Create a mirror view and deep_copy in a new space (specialization for same
// space)
template <class Space, class T, class... P>
typename Impl::MirrorDRViewType<Space, T, P...>::view_type
create_mirror_view_and_copy(
    const Space&, const Kokkos::DynRankView<T, P...>& src,
    std::string const& name = "",
    typename std::enable_if<
        Impl::MirrorDRViewType<Space, T, P...>::is_same_memspace>::type* =
        nullptr) {
  (void)name;
  return src;
}

// Create a mirror view and deep_copy in a new space (specialization for
// different space)
template <class Space, class T, class... P>
typename Impl::MirrorDRViewType<Space, T, P...>::view_type
create_mirror_view_and_copy(
    const Space&, const Kokkos::DynRankView<T, P...>& src,
    std::string const& name = "",
    typename std::enable_if<
        !Impl::MirrorDRViewType<Space, T, P...>::is_same_memspace>::type* = 0) {
  using Mirror = typename Impl::MirrorDRViewType<Space, T, P...>::view_type;
  std::string label = name.empty() ? src.label() : name;
  auto mirror       = Mirror(Kokkos::ViewAllocateWithoutInitializing(label),
                       Impl::reconstructLayout(src.layout(), src.rank()));
  deep_copy(mirror, src);
  return mirror;
}

}  // namespace Kokkos

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

namespace Kokkos {
/** \brief  Resize a view with copying old data to new data at the corresponding
 * indices. */
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) {
  typedef DynRankView<T, P...> drview_type;

  static_assert(Kokkos::ViewTraits<T, P...>::is_managed,
                "Can only resize managed views");

  drview_type v_resized(v.label(), n0, n1, n2, n3, n4, n5, n6, n7);

  Kokkos::Impl::DynRankViewRemap<drview_type, drview_type>(v_resized, v);

  v = v_resized;
}

/** \brief  Resize a view with copying old data to new data at the corresponding
 * indices. */
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) {
  typedef DynRankView<T, P...> drview_type;

  static_assert(Kokkos::ViewTraits<T, P...>::is_managed,
                "Can only realloc managed views");

  const std::string label = v.label();

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

}  // namespace Kokkos

#endif
