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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
* @class vtkDIYExplicitAssigner
* @brief assigner for use with DIY
*
* vtkDIYExplicitAssigner is a diy::StaticAssigner specialization that be used
* where the block assignment is not strictly round-robin or contiguous which
* assumes blocks equally split among ranks. This supports the case where each
* rank has arbitrary number of blocks per rank. The constructor is provided the
* mpi communicator and the number of local blocks. It performs parallel
* communication to exchange information about blocks with all participating
* ranks.
*
* vtkDIYExplicitAssigner also supports ability to pad each rank such that the
* total number of blocks across all ranks is a power of two.
*/
#ifndef vtkDIYExplicitAssigner_h
#define vtkDIYExplicitAssigner_h
#include "vtkObject.h"
#include "vtkParallelDIYModule.h" // for export macros
// clang-format off
#include "vtk_diy2.h"
#include VTK_DIY2(diy/mpi.hpp)
#include VTK_DIY2(diy/assigner.hpp)
// clang-format on
#ifdef _WIN32
#pragma warning(disable : 4275) /* non dll-interface class `diy::StaticAssigner` used as base for \
dll-interface class */
#endif
VTK_ABI_NAMESPACE_BEGIN
class VTKPARALLELDIY_EXPORT vtkDIYExplicitAssigner : public diy::StaticAssigner
{
public:
vtkDIYExplicitAssigner(
diy::mpi::communicator comm, int local_blocks, bool force_power_of_two = false);
int rank(int gid) const override;
void local_gids(int rank, std::vector<int>& gids) const override;
private:
std::vector<int> IScanBlockCounts;
};
VTK_ABI_NAMESPACE_END
#endif
// VTK-HeaderTest-Exclude: vtkDIYExplicitAssigner.h
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