vtkMultiProcessControllerHelper.h

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// SPDX-FileCopyrightText: Copyright (c) Kitware Inc.
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkMultiProcessControllerHelper_h
#define vtkMultiProcessControllerHelper_h

#include "vtkObject.h"
#include "vtkPVVTKExtensionsCoreModule.h" // needed for export macro
#include "vtkSmartPointer.h"              // needed for vtkSmartPointer.

#include <vector> // needed for std::vector

class vtkDataObject;
class vtkMultiProcessController;
class vtkMultiProcessStream;

class VTKPVVTKEXTENSIONSCORE_EXPORT vtkMultiProcessControllerHelper : public vtkObject
{
public:
  static vtkMultiProcessControllerHelper* New();
  vtkTypeMacro(vtkMultiProcessControllerHelper, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  static int ReduceToAll(vtkMultiProcessController* controller, vtkMultiProcessStream& data,
    void (*operation)(vtkMultiProcessStream& A, vtkMultiProcessStream& B), int tag);

  static vtkDataObject* MergePieces(vtkDataObject** pieces, unsigned int num_pieces);

  static bool MergePieces(
    std::vector<vtkSmartPointer<vtkDataObject>>& pieces, vtkDataObject* result);

protected:
  vtkMultiProcessControllerHelper();
  ~vtkMultiProcessControllerHelper() override;

private:
  vtkMultiProcessControllerHelper(const vtkMultiProcessControllerHelper&) = delete;
  void operator=(const vtkMultiProcessControllerHelper&) = delete;
};

#endif