EdgeListIterator

#include <vtkMutableUndirectedGraph.h>
#include <vtkSmartPointer.h>
#include <vtkEdgeListIterator.h>

int main(int, char *[])
{
  vtkSmartPointer<vtkMutableUndirectedGraph> g =
    vtkSmartPointer<vtkMutableUndirectedGraph>::New();

  // Create a graph
  vtkIdType v0 = g->AddVertex();
  vtkIdType v1 = g->AddVertex();
  vtkIdType v2 = g->AddVertex();

  g->AddEdge(v0, v1);
  g->AddEdge(v1, v2);
  g->AddEdge(v0, v2);

  vtkSmartPointer<vtkEdgeListIterator> edgeListIterator =
      vtkSmartPointer<vtkEdgeListIterator>::New();
  g->GetEdges(edgeListIterator);

  while(edgeListIterator->HasNext())
  {
    vtkEdgeType edge = edgeListIterator->Next();
    std::cout << "Edge: " << edge.Id << " is from "
          << "Source: " << edge.Source << " to Target: " << edge.Target << std::endl;
  }

  return EXIT_SUCCESS;
}

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(EdgeListIterator)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel QUIET)
if (NOT VTK_FOUND)
  message("Skipping EdgeListIterator: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(EdgeListIterator MACOSX_BUNDLE EdgeListIterator.cxx )
  target_link_libraries(EdgeListIterator PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(EdgeListIterator MACOSX_BUNDLE EdgeListIterator.cxx )
  target_link_libraries(EdgeListIterator PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS EdgeListIterator
    MODULES ${VTK_LIBRARIES}
    )
endif () 

cd EdgeListIterator/build 

cmake ..

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

make

./EdgeListIterator