Copied getSubarrayView method from NDArrayView to NDArray

      return ConstViewType( array.getData(), sizes );

   }

   template< std::size_t... Dimensions, typename... IndexTypes >

   __cuda_callable__

   auto getSubarrayView( IndexTypes&&... indices )

   {

      static_assert( sizeof...( indices ) == getDimension(), "got wrong number of indices" );

      static_assert( 0 < sizeof...(Dimensions) && sizeof...(Dimensions) <= getDimension(), "got wrong number of dimensions" );

      static_assert( __ndarray_impl::all_elements_in_range( 0, Permutation::size(), {Dimensions...} ),

                     "invalid dimensions" );

// FIXME: nvcc chokes on the variadic brace-initialization

#ifndef __NVCC__

      static_assert( __ndarray_impl::is_increasing_sequence( {Dimensions...} ),

                     "specifying permuted dimensions is not supported" );

#endif

      using Getter = __ndarray_impl::SubarrayGetter< Base, Permutation, Dimensions... >;

      using Subpermutation = typename Getter::Subpermutation;

      auto& begin = operator()( std::forward< IndexTypes >( indices )... );

      auto subarray_sizes = Getter::filterSizes( sizes, std::forward< IndexTypes >( indices )... );

      auto strides = Getter::getStrides( sizes, std::forward< IndexTypes >( indices )... );

      static_assert( Subpermutation::size() == sizeof...(Dimensions), "Bug - wrong subpermutation length." );

      static_assert( decltype(subarray_sizes)::getDimension() == sizeof...(Dimensions), "Bug - wrong dimension of the new sizes." );

      static_assert( decltype(strides)::getDimension() == sizeof...(Dimensions), "Bug - wrong dimension of the strides." );

      using SubarrayView = NDArrayView< ValueType, Device, decltype(subarray_sizes), Subpermutation, Base, decltype(strides) >;

      return SubarrayView{ &begin, subarray_sizes, strides };

   }

   template< typename Device2 = DeviceType, typename Func >

   void forAll( Func f ) const

   {