Tpetra_Details_getGraphOffRankOffsets_decl.hpp

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// @HEADER
// *****************************************************************************
//          Tpetra: Templated Linear Algebra Services Package
//
// Copyright 2008 NTESS and the Tpetra contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef TPETRA_DETAILS_GETGRAPHOFFRANKOFFSETS_DECL_HPP
#define TPETRA_DETAILS_GETGRAPHOFFRANKOFFSETS_DECL_HPP


#include "TpetraCore_config.h"
#include "Kokkos_Core.hpp"
#include "KokkosSparse_StaticCrsGraph.hpp"
#include "Tpetra_Details_LocalMap.hpp"
#include <type_traits>

namespace Tpetra {
namespace Details {
namespace Impl {

template <class LO,
          class GO,
          class DeviceType,
          class OffsetType = size_t>
class GetGraphOffRankOffsets {
 public:
  typedef typename DeviceType::device_type device_type;
  typedef OffsetType offset_type;
  typedef ::Kokkos::View<offset_type*,
                         device_type,
                         ::Kokkos::MemoryUnmanaged>
      offsets_type;
  using local_graph_type = ::KokkosSparse::StaticCrsGraph<LO,
                                                          ::Kokkos::LayoutLeft,
                                                          device_type, void, size_t>;
  typedef ::Tpetra::Details::LocalMap<LO, GO, device_type> local_map_type;
  typedef ::Kokkos::View<const typename local_graph_type::size_type*,
                         ::Kokkos::LayoutLeft,
                         device_type,
                         ::Kokkos::MemoryUnmanaged>
      row_offsets_type;
  // This is unmanaged for performance, because we need to take
  // subviews inside the functor.
  typedef ::Kokkos::View<const LO*,
                         ::Kokkos::LayoutLeft,
                         device_type,
                         ::Kokkos::MemoryUnmanaged>
      lcl_col_inds_type;

  GetGraphOffRankOffsets(const offsets_type& OffRankOffsets,
                         const local_map_type& lclColMap,
                         const local_map_type& lclDomMap,
                         const row_offsets_type& ptr,
                         const lcl_col_inds_type& ind);

  KOKKOS_FUNCTION void operator()(const LO& lclRowInd) const;

 private:
  offsets_type OffRankOffsets_;
  local_map_type lclColMap_;
  local_map_type lclDomMap_;
  row_offsets_type ptr_;
  lcl_col_inds_type ind_;
  LO lclNumRows_;
};

}  // namespace Impl

template <class OffsetsType,
          class LclMapType,
          class LclGraphType>
void getGraphOffRankOffsets(const OffsetsType& OffRankOffsets,
                            const LclMapType& lclColMap,
                            const LclMapType& lclDomMap,
                            const LclGraphType& lclGraph) {
  typedef typename OffsetsType::non_const_value_type offset_type;
  typedef typename LclMapType::local_ordinal_type LO;
  typedef typename LclMapType::global_ordinal_type GO;
  typedef typename LclMapType::device_type DT;

  typedef Impl::GetGraphOffRankOffsets<LO, GO, DT, offset_type> impl_type;

  // The functor's constructor runs the functor.
  impl_type impl(OffRankOffsets, lclColMap, lclDomMap, lclGraph.row_map, lclGraph.entries);
}

}  // namespace Details
}  // namespace Tpetra

#endif  // TPETRA_DETAILS_GETGRAPHOFFRANKOFFSETS_DECL_HPP