/usr/include/vtk-7.1/vtkMergeGraphs.h is in libvtk7-dev 7.1.1+dfsg1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 | /*=========================================================================
  Program:   Visualization Toolkit
  Module:    vtkMergeGraphs.h
  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.
=========================================================================*/
/*-------------------------------------------------------------------------
  Copyright 2008 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
  the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------*/
/**
 * @class   vtkMergeGraphs
 * @brief   combines two graphs
 *
 *
 * vtkMergeGraphs combines information from two graphs into one.
 * Both graphs must have pedigree ids assigned to the vertices.
 * The output will contain the vertices/edges in the first graph, in
 * addition to:
 *
 *  - vertices in the second graph whose pedigree id does not
 *    match a vertex in the first input
 *
 *  - edges in the second graph
 *
 * The output will contain the same attribute structure as the input;
 * fields associated only with the second input graph will not be passed
 * to the output. When possible, the vertex/edge data for new vertices and
 * edges will be populated with matching attributes on the second graph.
 * To be considered a matching attribute, the array must have the same name,
 * type, and number of components.
 *
 * @warning
 * This filter is not "domain-aware". Pedigree ids are assumed to be globally
 * unique, regardless of their domain.
*/
#ifndef vtkMergeGraphs_h
#define vtkMergeGraphs_h
#include "vtkInfovisCoreModule.h" // For export macro
#include "vtkGraphAlgorithm.h"
class vtkBitArray;
class vtkMutableGraphHelper;
class vtkStringArray;
class vtkTable;
class VTKINFOVISCORE_EXPORT vtkMergeGraphs : public vtkGraphAlgorithm
{
public:
  static vtkMergeGraphs* New();
  vtkTypeMacro(vtkMergeGraphs,vtkGraphAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);
  /**
   * This is the core functionality of the algorithm. Adds edges
   * and vertices from g2 into g1.
   */
  int ExtendGraph(vtkMutableGraphHelper* g1, vtkGraph* g2);
  //@{
  /**
   * Whether to use an edge window array. The default is to
   * not use a window array.
   */
  vtkSetMacro(UseEdgeWindow, bool);
  vtkGetMacro(UseEdgeWindow, bool);
  vtkBooleanMacro(UseEdgeWindow, bool);
  //@}
  //@{
  /**
   * The edge window array. The default array name is "time".
   */
  vtkSetStringMacro(EdgeWindowArrayName);
  vtkGetStringMacro(EdgeWindowArrayName);
  //@}
  //@{
  /**
   * The time window amount. Edges with values lower
   * than the maximum value minus this window will be
   * removed from the graph. The default edge window is
   * 10000.
   */
  vtkSetMacro(EdgeWindow, double);
  vtkGetMacro(EdgeWindow, double);
  //@}
protected:
  vtkMergeGraphs();
  ~vtkMergeGraphs();
  virtual int RequestData(
    vtkInformation*,
    vtkInformationVector**,
    vtkInformationVector*);
  virtual int FillInputPortInformation(int port, vtkInformation *info);
  bool UseEdgeWindow;
  char* EdgeWindowArrayName;
  double EdgeWindow;
private:
  vtkMergeGraphs(const vtkMergeGraphs&) VTK_DELETE_FUNCTION;
  void operator=(const vtkMergeGraphs&) VTK_DELETE_FUNCTION;
};
#endif
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