libtrilinos-kokkos-dev 12.12.1-5 / usr / include / trilinos / Kokkos_DynRankView.hpp

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/// \file Kokkos_DynRankView.hpp
/// \brief Declaration and definition of Kokkos::Experimental::DynRankView.
///
/// This header file declares and defines Kokkos::Experimental::DynRankView and its
/// related nonmember functions.
/*
 *   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 name is subdynrankview
 *   4. Every subdynrankview is returned with LayoutStride
 *
 *   NEW: Redesigned DynRankView
 *   5. subview function name now available
 *   6. Copy and Copy-Assign View to DynRankView
 *   7. deep_copy between Views and DynRankViews
 *   8. rank( view ); returns the rank of View or DynRankView
 */

#ifndef KOKKOS_DYNRANKVIEW_HPP
#define KOKKOS_DYNRANKVIEW_HPP

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

namespace Kokkos {
namespace Experimental {

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

namespace Impl {

template <typename Specialize>
struct DynRankDimTraits {

  enum : size_t{unspecified = ~size_t(0)};

  // 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] );
  }

  // 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]
                 );
  }

  // Create a view from the given dimension arguments.
  // This is only necessary because the shmem constructor doesn't take a layout.
  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] : ~size_t(0)
                 , dynrank > 1 ? layout.dimension[1] : ~size_t(0)
                 , dynrank > 2 ? layout.dimension[2] : ~size_t(0)
                 , dynrank > 3 ? layout.dimension[3] : ~size_t(0)
                 , dynrank > 4 ? layout.dimension[4] : ~size_t(0)
                 , dynrank > 5 ? layout.dimension[5] : ~size_t(0)
                 , dynrank > 6 ? layout.dimension[6] : ~size_t(0)
                 , dynrank > 7 ? layout.dimension[7] : ~size_t(0)
                 );
  }

  // 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] : ~size_t(0)
                 , dynrank > 0 ? layout.stride[0] : (0)
                 , dynrank > 1 ? layout.dimension[1] : ~size_t(0)
                 , dynrank > 1 ? layout.stride[1] : (0)
                 , dynrank > 2 ? layout.dimension[2] : ~size_t(0)
                 , dynrank > 2 ? layout.stride[2] : (0)
                 , dynrank > 3 ? layout.dimension[3] : ~size_t(0)
                 , dynrank > 3 ? layout.stride[3] : (0)
                 , dynrank > 4 ? layout.dimension[4] : ~size_t(0)
                 , dynrank > 4 ? layout.stride[4] : (0)
                 , dynrank > 5 ? layout.dimension[5] : ~size_t(0)
                 , dynrank > 5 ? layout.stride[5] : (0)
                 , dynrank > 6 ? layout.dimension[6] : ~size_t(0)
                 , dynrank > 6 ? layout.stride[6] : (0)
                 , dynrank > 7 ? layout.dimension[7] : ~size_t(0)
                 , 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
    Kokkos::abort("DynRankView bounds error");
#endif
  }
}


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

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
        )
      )
    )
  ) , 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 , void >  DstType ;
  typedef ViewMapping< SrcTraits , void >  SrcType ;

  template < typename DT , typename ... DP , typename ST , typename ... SP >
  KOKKOS_INLINE_FUNCTION
  static void assign( Kokkos::Experimental::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_offset = dst_offset_type(std::integral_constant<unsigned,0>() , src.layout() ); //Check this for integer input1 for padding, etc
      dst.m_map.m_handle = Kokkos::Experimental::Impl::ViewDataHandle< DstTraits >::assign( src.m_map.m_handle , src.m_track );
      dst.m_track.assign( src.m_track , DstTraits::is_managed );
      dst.m_rank = src.Rank ;
    }
};

} //end Impl

/* \class DynRankView
 * \brief Container that creates a Kokkos view with rank determined at runtime.
 *   Essentially this is a rank 7 view that wraps the access operators
 *   to yield the functionality of a 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 name is subdynrankview
 *   4. Every subdynrankview is returned with LayoutStride
 *
 *   NEW: Redesigned DynRankView
 *   5. subview function name now available
 *   6. Copy and Copy-Assign View to DynRankView
 *   7. deep_copy between Views and DynRankViews
 *   8. 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::Experimental::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 Impl::ViewMapping ;

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

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

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


private:
  typedef Kokkos::Experimental::Impl::ViewMapping< traits , void > map_type ;
  typedef Kokkos::Experimental::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'.
   */

  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(); }

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

  KOKKOS_INLINE_FUNCTION constexpr size_t size() const { return m_map.dimension_0() *
                                                                m_map.dimension_1() *
                                                                m_map.dimension_2() *
                                                                m_map.dimension_3() *
                                                                m_map.dimension_4() *
                                                                m_map.dimension_5() *
                                                                m_map.dimension_6() *
                                                                m_map.dimension_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(); }
  // Deprecated, use 'span()' instead
  KOKKOS_INLINE_FUNCTION constexpr size_t capacity() const { return m_map.span(); }
  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(); }

  // 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(); }

  //----------------------------------------
  // Allow specializations to query their specialized map

  KOKKOS_INLINE_FUNCTION
  const Kokkos::Experimental::Impl::ViewMapping< traits , void > &
  implementation_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::Experimental::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 implementation_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 = implementation_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<Kokkos::Unmanaged | traits::memory_traits::RandomAccess | traits::memory_traits::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);
    }

#undef KOKKOS_IMPL_VIEW_OPERATOR_VERIFY

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

  KOKKOS_INLINE_FUNCTION
  ~DynRankView() {}

  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::Experimental::Impl::ViewMapping< traits , SrcTraits , void > 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::Experimental::Impl::ViewMapping< traits , SrcTraits , void > 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;
    }

// Experimental
// 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::Experimental::Impl::ViewMapping< traits , SrcTraits , Kokkos::Experimental::Impl::ViewToDynRankViewTag >  Mapping ;
      static_assert( Mapping::is_assignable , "Incompatible 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::Experimental::Impl::ViewMapping< traits , SrcTraits , Kokkos::Experimental::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 ~size_t(0) so that rank deduction can properly take place
  template< class ... P >
  explicit inline
  DynRankView( const Impl::ViewCtorProp< P ... > & arg_prop
      , typename std::enable_if< ! Impl::ViewCtorProp< P... >::has_pointer
                               , typename traits::array_layout
                               >::type const & arg_layout
      )
      : m_track()
      , m_map()
      , m_rank( Impl::DynRankDimTraits<typename traits::specialize>::computeRank(arg_layout) )
    {
      // Append layout and spaces if not input
      typedef Impl::ViewCtorProp< P ... > alloc_prop_input ;

      // use 'std::integral_constant<unsigned,I>' for non-types
      // to avoid duplicate class error.
      typedef 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 &&
           ! alloc_prop::execution_space::is_initialized() ) {
        // 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( 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 ) {
        traits::device_type::memory_space::execution_space::fence();
      }
#endif
//------------------------------------------------------------

      Kokkos::Experimental::Impl::SharedAllocationRecord<> *
        record = m_map.allocate_shared( prop , Impl::DynRankDimTraits<typename traits::specialize>::createLayout(arg_layout) );

//------------------------------------------------------------
#if defined( KOKKOS_ENABLE_CUDA )
      if ( std::is_same< Kokkos::CudaUVMSpace , typename traits::device_type::memory_space >::value ) {
        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 Impl::ViewCtorProp< P ... > & arg_prop
      , typename std::enable_if< 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>::createLayout(arg_layout) )
      , m_rank( Impl::DynRankDimTraits<typename traits::specialize>::computeRank(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 Impl::ViewCtorProp< P ... > & arg_prop
      , typename std::enable_if< ! Impl::ViewCtorProp< P... >::has_pointer
                               , size_t
                               >::type const arg_N0 = ~size_t(0)
      , const size_t arg_N1 = ~size_t(0)
      , const size_t arg_N2 = ~size_t(0)
      , const size_t arg_N3 = ~size_t(0)
      , const size_t arg_N4 = ~size_t(0)
      , const size_t arg_N5 = ~size_t(0)
      , const size_t arg_N6 = ~size_t(0)
      , const size_t arg_N7 = ~size_t(0)
      )
    : 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 Impl::ViewCtorProp< P ... > & arg_prop
      , typename std::enable_if< Impl::ViewCtorProp< P... >::has_pointer
                               , size_t
                               >::type const arg_N0 = ~size_t(0)
      , const size_t arg_N1 = ~size_t(0)
      , const size_t arg_N2 = ~size_t(0)
      , const size_t arg_N3 = ~size_t(0)
      , const size_t arg_N4 = ~size_t(0)
      , const size_t arg_N5 = ~size_t(0)
      , const size_t arg_N6 = ~size_t(0)
      , const size_t arg_N7 = ~size_t(0)
      )
    : 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::Experimental::Impl::is_view_label<Label>::value ,
          typename traits::array_layout >::type const & arg_layout
      )
    : DynRankView( 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::Experimental::Impl::is_view_label<Label>::value ,
        const size_t >::type arg_N0 = ~size_t(0)
      , const size_t arg_N1 = ~size_t(0)
      , const size_t arg_N2 = ~size_t(0)
      , const size_t arg_N3 = ~size_t(0)
      , const size_t arg_N4 = ~size_t(0)
      , const size_t arg_N5 = ~size_t(0)
      , const size_t arg_N6 = ~size_t(0)
      , const size_t arg_N7 = ~size_t(0)
      )
    : DynRankView( 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
  explicit inline
  DynRankView( const ViewAllocateWithoutInitializing & arg_prop
      , const typename traits::array_layout & arg_layout
      )
    : DynRankView( Impl::ViewCtorProp< std::string , Kokkos::Experimental::Impl::WithoutInitializing_t >( arg_prop.label , Kokkos::Experimental::WithoutInitializing )
          , Impl::DynRankDimTraits<typename traits::specialize>::createLayout(arg_layout)
      )
    {}

  explicit inline
  DynRankView( const ViewAllocateWithoutInitializing & arg_prop
      , const size_t arg_N0 = ~size_t(0)
      , const size_t arg_N1 = ~size_t(0)
      , const size_t arg_N2 = ~size_t(0)
      , const size_t arg_N3 = ~size_t(0)
      , const size_t arg_N4 = ~size_t(0)
      , const size_t arg_N5 = ~size_t(0)
      , const size_t arg_N6 = ~size_t(0)
      , const size_t arg_N7 = ~size_t(0)
      )
    : DynRankView(Impl::ViewCtorProp< std::string , Kokkos::Experimental::Impl::WithoutInitializing_t >( arg_prop.label , Kokkos::Experimental::WithoutInitializing ), 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 = ~size_t(0)
      , const size_t arg_N1 = ~size_t(0)
      , const size_t arg_N2 = ~size_t(0)
      , const size_t arg_N3 = ~size_t(0)
      , const size_t arg_N4 = ~size_t(0)
      , const size_t arg_N5 = ~size_t(0)
      , const size_t arg_N6 = ~size_t(0)
      , const size_t arg_N7 = ~size_t(0)
      )
    : DynRankView( 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( Impl::ViewCtorProp<pointer_type>(arg_ptr) , arg_layout )
    {}


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

  static inline
  size_t shmem_size( const size_t arg_N0 = ~size_t(0) ,
                     const size_t arg_N1 = ~size_t(0) ,
                     const size_t arg_N2 = ~size_t(0) ,
                     const size_t arg_N3 = ~size_t(0) ,
                     const size_t arg_N4 = ~size_t(0) ,
                     const size_t arg_N5 = ~size_t(0) ,
                     const size_t arg_N6 = ~size_t(0) ,
                     const size_t arg_N7 = ~size_t(0) )
  {
    const size_t num_passed_args =
      ( arg_N0 != ~size_t(0) ) + ( arg_N1 != ~size_t(0) ) + ( arg_N2 != ~size_t(0) ) +
      ( arg_N3 != ~size_t(0) ) + ( arg_N4 != ~size_t(0) ) + ( arg_N5 != ~size_t(0) ) +
      ( arg_N6 != ~size_t(0) ) + ( arg_N7 != ~size_t(0) );

    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( 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 = ~size_t(0)
      , const size_t arg_N1 = ~size_t(0)
      , const size_t arg_N2 = ~size_t(0)
      , const size_t arg_N3 = ~size_t(0)
      , const size_t arg_N4 = ~size_t(0)
      , const size_t arg_N5 = ~size_t(0)
      , const size_t arg_N6 = ~size_t(0)
      , const size_t arg_N7 = ~size_t(0) )

    : DynRankView( 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 {};

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
      )
    ), 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 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::Experimental::DynRankView< T , P...> const & src
                    , Args ... args )
    {

       typedef ViewMapping< traits_type, void >  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_offset.m_dim , args... ) ;

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

      dst.m_track = src.m_track ;

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

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

      dst.m_map.m_handle = dst_handle_type( src.m_map.m_handle +
                                      src.m_map.m_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 ;
    }
};

} // end Impl


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

template< class D , class ... P , class ...Args >
KOKKOS_INLINE_FUNCTION
Subdynrankview< ViewTraits<D******* , P...> , Args... >
subdynrankview( const Kokkos::Experimental::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::Experimental::Impl::ViewMapping< Kokkos::Experimental::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::Experimental::DynRankView< D , P... > &src , Args...args)
  {
    return subdynrankview( src , args... );
  }

} // namespace Experimental
} // namespace Kokkos

namespace Kokkos {
namespace Experimental {

// 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.dimension(0) == rhs.dimension(0) &&
    lhs.dimension(1) == rhs.dimension(1) &&
    lhs.dimension(2) == rhs.dimension(2) &&
    lhs.dimension(3) == rhs.dimension(3) &&
    lhs.dimension(4) == rhs.dimension(4) &&
    lhs.dimension(5) == rhs.dimension(5) &&
    lhs.dimension(6) == rhs.dimension(6) &&
    lhs.dimension(7) == rhs.dimension(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) );
}

} //end Experimental
} //end Kokkos

//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
namespace Kokkos {
namespace Experimental {
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.dimension_1();
    const size_t n2 = output.dimension_2();
    const size_t n3 = output.dimension_3();
    const size_t n4 = output.dimension_4();
    const size_t n5 = output.dimension_5();
    const size_t n6 = output.dimension_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(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.dimension_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.dimension_0() , (size_t)arg_in.dimension_0() ) )
    , n1( std::min( (size_t)arg_out.dimension_1() , (size_t)arg_in.dimension_1() ) )
    , n2( std::min( (size_t)arg_out.dimension_2() , (size_t)arg_in.dimension_2() ) )
    , n3( std::min( (size_t)arg_out.dimension_3() , (size_t)arg_in.dimension_3() ) )
    , n4( std::min( (size_t)arg_out.dimension_4() , (size_t)arg_in.dimension_4() ) )
    , n5( std::min( (size_t)arg_out.dimension_5() , (size_t)arg_in.dimension_5() ) )
    , n6( std::min( (size_t)arg_out.dimension_6() , (size_t)arg_in.dimension_6() ) )
    , n7( std::min( (size_t)arg_out.dimension_7() , (size_t)arg_in.dimension_7() ) )
    {
      typedef Kokkos::RangePolicy< ExecSpace > Policy ;
      const Kokkos::Impl::ParallelFor< DynRankViewRemap , Policy > closure( *this , Policy( 0 , n0 ) );
      closure.execute();
    }

  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(i0,i1,i2,i3,i4,i5,i6) = input(i0,i1,i2,i3,i4,i5,i6);
    }}}}}}
  }
};

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


namespace Kokkos {
namespace Experimental {

/** \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 * = 0 )
{
  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::Experimental::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::Experimental::is_dyn_rank_view<DstType>::value || Kokkos::Experimental::is_dyn_rank_view<SrcType>::value)
  )>::type * = 0 )
{
  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.dimension_0() == src.dimension_0() &&
         dst.dimension_1() == src.dimension_1() &&
         dst.dimension_2() == src.dimension_2() &&
         dst.dimension_3() == src.dimension_3() &&
         dst.dimension_4() == src.dimension_4() &&
         dst.dimension_5() == src.dimension_5() &&
         dst.dimension_6() == src.dimension_6() &&
         dst.dimension_7() == src.dimension_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.dimension_0() == src.dimension_0() &&
         dst.dimension_1() == src.dimension_1() &&
         dst.dimension_2() == src.dimension_2() &&
         dst.dimension_3() == src.dimension_3() &&
         dst.dimension_4() == src.dimension_4() &&
         dst.dimension_5() == src.dimension_5() &&
         dst.dimension_6() == src.dimension_6() &&
         dst.dimension_7() == src.dimension_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::Experimental::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::Experimental::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");
    }
  }
}

} //end Experimental
} //end Kokkos


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

namespace Kokkos {
namespace Experimental {

namespace Impl {


// Deduce Mirror Types
template<class Space, class T, class ... P>
struct MirrorDRViewType {
  // The incoming view_type
  typedef typename Kokkos::Experimental::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::Experimental::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::Experimental::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::Experimental::DynRankView<data_type,array_layout,Space> view_type;
};

}


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 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()) );
}


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 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::Experimental::DynRankView<T,P...> & src) {
  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 * = 0
                  )
{
  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::Experimental::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::Experimental::DynRankView<T,P...> & src
  , typename std::enable_if<Impl::MirrorDRViewType<Space,T,P ...>::is_same_memspace>::type* = 0 ) {
  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::Experimental::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()) );
}

} //end Experimental
} //end Kokkos


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

namespace Kokkos {
namespace Experimental {
/** \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 = ~size_t(0) ,
             const size_t n1 = ~size_t(0) ,
             const size_t n2 = ~size_t(0) ,
             const size_t n3 = ~size_t(0) ,
             const size_t n4 = ~size_t(0) ,
             const size_t n5 = ~size_t(0) ,
             const size_t n6 = ~size_t(0) ,
             const size_t n7 = ~size_t(0) )
{
  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 );

  Kokkos::Experimental::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 = ~size_t(0) ,
              const size_t n1 = ~size_t(0) ,
              const size_t n2 = ~size_t(0) ,
              const size_t n3 = ~size_t(0) ,
              const size_t n4 = ~size_t(0) ,
              const size_t n5 = ~size_t(0) ,
              const size_t n6 = ~size_t(0) ,
              const size_t n7 = ~size_t(0) )
{
  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 );
}

} //end Experimental

} //end Kokkos

using Kokkos::Experimental::is_dyn_rank_view ;

namespace Kokkos {

template< typename D , class ... P >
using DynRankView = Kokkos::Experimental::DynRankView< D , P... > ;

using Kokkos::Experimental::deep_copy ;
using Kokkos::Experimental::create_mirror ;
using Kokkos::Experimental::create_mirror_view ;
using Kokkos::Experimental::subdynrankview ;
using Kokkos::Experimental::subview ;
using Kokkos::Experimental::resize ;
using Kokkos::Experimental::realloc ;

} //end Kokkos
#endif