Tpetra_RowGraph_def.hpp

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

#ifndef TPETRA_ROWGRAPH_DEF_HPP
#define TPETRA_ROWGRAPH_DEF_HPP

namespace Tpetra {
  template<class LocalOrdinal, class GlobalOrdinal, class Node>
  void
  RowGraph<LocalOrdinal,GlobalOrdinal,Node>::
  pack (const Teuchos::ArrayView<const LocalOrdinal>& exportLIDs,
        Teuchos::Array<GlobalOrdinal>& exports,
        const Teuchos::ArrayView<size_t>& numPacketsPerLID,
        size_t& constantNumPackets) const
  {
    using Teuchos::Array;
    typedef LocalOrdinal LO;
    typedef GlobalOrdinal GO;
    typedef Map<LO, GO, Node> map_type;
    const char tfecfFuncName[] = "packAndPrepare";

    TEUCHOS_TEST_FOR_EXCEPTION_CLASS_FUNC(
      exportLIDs.size() != numPacketsPerLID.size(), std::runtime_error,
      ": exportLIDs and numPacketsPerLID must have the same size.");

    const map_type& srcMap = * (this->getRowMap ());
    constantNumPackets = 0;

    // Set numPacketsPerLID[i] to the number of entries owned by the
    // calling process in (local) row exportLIDs[i] of the graph, that
    // the caller wants us to send out.  Compute the total number of
    // packets (that is, entries) owned by this process in all the
    // rows that the caller wants us to send out.
    size_t totalNumPackets = 0;
    nonconst_global_inds_host_view_type row;
    for (LO i = 0; i < exportLIDs.size (); ++i) {
      const GO GID = srcMap.getGlobalElement (exportLIDs[i]);
      size_t row_length = this->getNumEntriesInGlobalRow (GID);
      numPacketsPerLID[i] = row_length;
      totalNumPackets += row_length;
    }

    exports.resize (totalNumPackets);

    // Loop again over the rows to export, and pack rows of indices
    // into the output buffer.
    size_t exportsOffset = 0;
    for (LO i = 0; i < exportLIDs.size (); ++i) {
      const GO GID = srcMap.getGlobalElement (exportLIDs[i]);
      size_t row_length = this->getNumEntriesInGlobalRow (GID);
      Kokkos::resize(row,row_length);
      size_t check_row_length = 0;
      this->getGlobalRowCopy (GID, row, check_row_length);

      for (size_t j=0; j<row_length; ++j) {
        exports[exportsOffset+j] = row[j];
      }
      exportsOffset += row.extent(0);
    }
  }

} // namespace Tpetra

//
// Explicit instantiation macro
//
// Must be expanded from within the Tpetra namespace!
//

#define TPETRA_ROWGRAPH_INSTANT(LO,GO,NODE) \
  template class RowGraph< LO , GO , NODE >;

#endif // TPETRA_ROWGRAPH_DEF_HPP