unittests_trimesh_iterators.hh 15.8 KB
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#ifndef INCLUDE_UNITTESTS_TRIMESH_ITERATORS_HH
#define INCLUDE_UNITTESTS_TRIMESH_ITERATORS_HH

#include <gtest/gtest.h>
#include <Unittests/unittests_common.hh>

#include <iostream>

class OpenMeshIterators : public OpenMeshBase {

    protected:

        // This function is called before each test is run
        virtual void SetUp() {
        }

        // This function is called after all tests are through
        virtual void TearDown() {

            // Do some final stuff with the member data here...
        }

    // Member already defined in OpenMeshBase
    //Mesh mesh_;  
};

/*
 * ====================================================================
 * Define tests below
 * ====================================================================
 */

/*
 * Small VertexIterator Test
 */
TEST_F(OpenMeshIterators, VertexIter) {

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  mesh_.clear();
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  // Add some vertices
  Mesh::VertexHandle vhandle[4];
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  vhandle[0] = mesh_.add_vertex(Mesh::Point(0, 0, 0));
  vhandle[1] = mesh_.add_vertex(Mesh::Point(0, 1, 0));
  vhandle[2] = mesh_.add_vertex(Mesh::Point(1, 1, 0));
  vhandle[3] = mesh_.add_vertex(Mesh::Point(1, 0, 0));
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  // Add two faces
  std::vector<Mesh::VertexHandle> face_vhandles;

  face_vhandles.push_back(vhandle[2]);
  face_vhandles.push_back(vhandle[1]);
  face_vhandles.push_back(vhandle[0]);
  mesh_.add_face(face_vhandles);

  face_vhandles.clear();

  face_vhandles.push_back(vhandle[2]);
  face_vhandles.push_back(vhandle[0]);
  face_vhandles.push_back(vhandle[3]);
  mesh_.add_face(face_vhandles);

  // Test setup:
  //  1 === 2
  //  |   / |    
  //  |  /  |
  //  | /   |
  //  0 === 3

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  Mesh::VertexIter v_it  = mesh_.vertices_begin(); 
  Mesh::VertexIter v_end = mesh_.vertices_end(); 
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  EXPECT_EQ(0, v_it.handle().idx()) << "Index wrong for vertex iterator vertices_begin()";
  ++v_it;
  EXPECT_EQ(1, v_it.handle().idx()) << "Index wrong in vertex iterator";
  ++v_it;
  EXPECT_EQ(2, v_it.handle().idx()) << "Index wrong in vertex iterator";
  ++v_it;
  EXPECT_EQ(3, v_it.handle().idx()) << "Index wrong in vertex iterator";
  ++v_it;
  EXPECT_EQ(4, v_it.handle().idx()) << "Index wrong in vertex iterator";

  // Check end iterator
  EXPECT_EQ(4, v_end.handle().idx()) << "Index wrong in vertex iterator for vertices_end()";    
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  // Second iterator test to start at a specific position

}

/*
 * Small VertexIterator Test to check if we can start iterating at a specific handle
 */
TEST_F(OpenMeshIterators, VertexIterStartPosition) {

  mesh_.clear();

  // Add some vertices
  Mesh::VertexHandle vhandle[4];

  vhandle[0] = mesh_.add_vertex(Mesh::Point(0, 0, 0));
  vhandle[1] = mesh_.add_vertex(Mesh::Point(0, 1, 0));
  vhandle[2] = mesh_.add_vertex(Mesh::Point(1, 1, 0));
  vhandle[3] = mesh_.add_vertex(Mesh::Point(1, 0, 0));

  // Add two faces
  std::vector<Mesh::VertexHandle> face_vhandles;

  face_vhandles.push_back(vhandle[2]);
  face_vhandles.push_back(vhandle[1]);
  face_vhandles.push_back(vhandle[0]);
  mesh_.add_face(face_vhandles);

  face_vhandles.clear();

  face_vhandles.push_back(vhandle[2]);
  face_vhandles.push_back(vhandle[0]);
  face_vhandles.push_back(vhandle[3]);
  mesh_.add_face(face_vhandles);

  // Test setup:
  //  1 === 2
  //  |   / |
  //  |  /  |
  //  | /   |
  //  0 === 3

  Mesh::VertexIter v_it  = Mesh::VertexIter(mesh_,mesh_.vertex_handle(2));
  Mesh::VertexIter v_end = mesh_.vertices_end();

  EXPECT_EQ(2, v_it.handle().idx()) << "Index wrong in vertex iterator";
  ++v_it;
  EXPECT_EQ(3, v_it.handle().idx()) << "Index wrong in vertex iterator";
  ++v_it;
  EXPECT_EQ(4, v_it.handle().idx()) << "Index wrong in vertex iterator";

  // Check end iterator
  EXPECT_EQ(4, v_end.handle().idx()) << "Index wrong in vertex iterator for vertices_end()";


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}

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/*
 * Small EdgeIterator Test
 */
TEST_F(OpenMeshIterators, EdgeIter) {

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  mesh_.clear();

  // Add some vertices
  Mesh::VertexHandle vhandle[4];

  vhandle[0] = mesh_.add_vertex(Mesh::Point(0, 0, 0));
  vhandle[1] = mesh_.add_vertex(Mesh::Point(0, 1, 0));
  vhandle[2] = mesh_.add_vertex(Mesh::Point(1, 1, 0));
  vhandle[3] = mesh_.add_vertex(Mesh::Point(1, 0, 0));

  // Add two faces
  std::vector<Mesh::VertexHandle> face_vhandles;

  face_vhandles.push_back(vhandle[2]);
  face_vhandles.push_back(vhandle[1]);
  face_vhandles.push_back(vhandle[0]);
  mesh_.add_face(face_vhandles);

  face_vhandles.clear();

  face_vhandles.push_back(vhandle[2]);
  face_vhandles.push_back(vhandle[0]);
  face_vhandles.push_back(vhandle[3]);
  mesh_.add_face(face_vhandles);

  // Test setup:
  //  1 === 2
  //  |   / |    
  //  |  /  |
  //  | /   |
  //  0 === 3

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  Mesh::EdgeIter e_it  = mesh_.edges_begin(); 
  Mesh::EdgeIter e_end = mesh_.edges_end(); 
  
  EXPECT_EQ(0, e_it.handle().idx()) << "Wrong start index in edge iterator";
  EXPECT_EQ(5, e_end.handle().idx()) << "Wrong end index in edge iterator";
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  EXPECT_EQ(1, mesh_.to_vertex_handle(mesh_.halfedge_handle(e_it,0)).idx() )   << "1: Wrong to vertex handle of halfedge 0";
  EXPECT_EQ(2, mesh_.from_vertex_handle(mesh_.halfedge_handle(e_it,0)).idx() ) << "1: Wrong from vertex handle of halfedge 0";
  EXPECT_EQ(2, mesh_.to_vertex_handle(mesh_.halfedge_handle(e_it,1)).idx() )   << "1: Wrong to vertex handle of halfedge 1";
  EXPECT_EQ(1, mesh_.from_vertex_handle(mesh_.halfedge_handle(e_it,1)).idx() ) << "1: Wrong from vertex handle of halfedge 1";
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  ++e_it;
  EXPECT_EQ(1, e_it.handle().idx()) << "Wrong index in edge iterator";
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  EXPECT_EQ(0, mesh_.to_vertex_handle(mesh_.halfedge_handle(e_it,0)).idx() )   << "2: Wrong to vertex handle of halfedge 0";
  EXPECT_EQ(1, mesh_.from_vertex_handle(mesh_.halfedge_handle(e_it,0)).idx() ) << "2: Wrong from vertex handle of halfedge 0";
  EXPECT_EQ(1, mesh_.to_vertex_handle(mesh_.halfedge_handle(e_it,1)).idx() )   << "2: Wrong to vertex handle of halfedge 1";
  EXPECT_EQ(0, mesh_.from_vertex_handle(mesh_.halfedge_handle(e_it,1)).idx() ) << "2: Wrong from vertex handle of halfedge 1";
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  ++e_it;
  EXPECT_EQ(2, e_it.handle().idx()) << "Wrong index in edge iterator";
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  EXPECT_EQ(2, mesh_.to_vertex_handle(mesh_.halfedge_handle(e_it,0)).idx() )   << "3: Wrong to vertex handle of halfedge 0";
  EXPECT_EQ(0, mesh_.from_vertex_handle(mesh_.halfedge_handle(e_it,0)).idx() ) << "3: Wrong from vertex handle of halfedge 0";
  EXPECT_EQ(0, mesh_.to_vertex_handle(mesh_.halfedge_handle(e_it,1)).idx() )   << "3: Wrong to vertex handle of halfedge 1";
  EXPECT_EQ(2, mesh_.from_vertex_handle(mesh_.halfedge_handle(e_it,1)).idx() ) << "3: Wrong from vertex handle of halfedge 1";
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  ++e_it;
  EXPECT_EQ(3, e_it.handle().idx()) << "Wrong index in edge iterator";
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  EXPECT_EQ(3, mesh_.to_vertex_handle(mesh_.halfedge_handle(e_it,0)).idx() )   << "4: Wrong to vertex handle of halfedge 0";
  EXPECT_EQ(0, mesh_.from_vertex_handle(mesh_.halfedge_handle(e_it,0)).idx() ) << "4: Wrong from vertex handle of halfedge 0";
  EXPECT_EQ(0, mesh_.to_vertex_handle(mesh_.halfedge_handle(e_it,1)).idx() )   << "4: Wrong to vertex handle of halfedge 1";
  EXPECT_EQ(3, mesh_.from_vertex_handle(mesh_.halfedge_handle(e_it,1)).idx() ) << "4: Wrong from vertex handle of halfedge 1";
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  ++e_it;
  EXPECT_EQ(4, e_it.handle().idx()) << "Wrong index in edge iterator";
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  EXPECT_EQ(2, mesh_.to_vertex_handle(mesh_.halfedge_handle(e_it,0)).idx() )   << "5: Wrong to vertex handle of halfedge 0";
  EXPECT_EQ(3, mesh_.from_vertex_handle(mesh_.halfedge_handle(e_it,0)).idx() ) << "5: Wrong from vertex handle of halfedge 0";
  EXPECT_EQ(3, mesh_.to_vertex_handle(mesh_.halfedge_handle(e_it,1)).idx() )   << "5: Wrong to vertex handle of halfedge 1";
  EXPECT_EQ(2, mesh_.from_vertex_handle(mesh_.halfedge_handle(e_it,1)).idx() ) << "5: Wrong from vertex handle of halfedge 1";
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}

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/* Adds a cube to a trimesh and runs over all halfedges
 */
TEST_F(OpenMeshIterators, HalfedgeIterSkipping) {

  mesh_.clear();

  // Add some vertices
  Mesh::VertexHandle vhandle[8];
  vhandle[0] = mesh_.add_vertex(Mesh::Point(-1, -1,  1));
  vhandle[1] = mesh_.add_vertex(Mesh::Point( 1, -1,  1));
  vhandle[2] = mesh_.add_vertex(Mesh::Point( 1,  1,  1));
  vhandle[3] = mesh_.add_vertex(Mesh::Point(-1,  1,  1));
  vhandle[4] = mesh_.add_vertex(Mesh::Point(-1, -1, -1));
  vhandle[5] = mesh_.add_vertex(Mesh::Point( 1, -1, -1));
  vhandle[6] = mesh_.add_vertex(Mesh::Point( 1,  1, -1));
  vhandle[7] = mesh_.add_vertex(Mesh::Point(-1,  1, -1));

  // Add six faces to form a cube
  std::vector<Mesh::VertexHandle> face_vhandles;

  face_vhandles.clear();
  face_vhandles.push_back(vhandle[0]);
  face_vhandles.push_back(vhandle[1]);
  face_vhandles.push_back(vhandle[3]);
  mesh_.add_face(face_vhandles);

  face_vhandles.clear();
  face_vhandles.push_back(vhandle[1]);
  face_vhandles.push_back(vhandle[2]);
  face_vhandles.push_back(vhandle[3]);
  mesh_.add_face(face_vhandles);

  //=======================

  face_vhandles.clear();
  face_vhandles.push_back(vhandle[7]);
  face_vhandles.push_back(vhandle[6]);
  face_vhandles.push_back(vhandle[5]);
  mesh_.add_face(face_vhandles);

  face_vhandles.clear();
  face_vhandles.push_back(vhandle[7]);
  face_vhandles.push_back(vhandle[5]);
  face_vhandles.push_back(vhandle[4]);
  mesh_.add_face(face_vhandles);

  //=======================

  face_vhandles.clear();
  face_vhandles.push_back(vhandle[1]);
  face_vhandles.push_back(vhandle[0]);
  face_vhandles.push_back(vhandle[4]);
  mesh_.add_face(face_vhandles);

  face_vhandles.clear();
  face_vhandles.push_back(vhandle[1]);
  face_vhandles.push_back(vhandle[4]);
  face_vhandles.push_back(vhandle[5]);
  mesh_.add_face(face_vhandles);

  //=======================

  face_vhandles.clear();
  face_vhandles.push_back(vhandle[2]);
  face_vhandles.push_back(vhandle[1]);
  face_vhandles.push_back(vhandle[5]);
  mesh_.add_face(face_vhandles);

  face_vhandles.clear();
  face_vhandles.push_back(vhandle[2]);
  face_vhandles.push_back(vhandle[5]);
  face_vhandles.push_back(vhandle[6]);
  mesh_.add_face(face_vhandles);


  //=======================

  face_vhandles.clear();
  face_vhandles.push_back(vhandle[3]);
  face_vhandles.push_back(vhandle[2]);
  face_vhandles.push_back(vhandle[6]);
  mesh_.add_face(face_vhandles);

  face_vhandles.clear();
  face_vhandles.push_back(vhandle[3]);
  face_vhandles.push_back(vhandle[6]);
  face_vhandles.push_back(vhandle[7]);
  mesh_.add_face(face_vhandles);

  //=======================

  face_vhandles.clear();
  face_vhandles.push_back(vhandle[0]);
  face_vhandles.push_back(vhandle[3]);
  face_vhandles.push_back(vhandle[7]);
  mesh_.add_face(face_vhandles);

  face_vhandles.clear();
  face_vhandles.push_back(vhandle[0]);
  face_vhandles.push_back(vhandle[7]);
  face_vhandles.push_back(vhandle[4]);
  mesh_.add_face(face_vhandles);


  // Test setup:
  //
  //
  //    3 ======== 2
  //   /          /|
  //  /          / |      z
  // 0 ======== 1  |      |
  // |          |  |      |   y
  // |  7       |  6      |  /
  // |          | /       | /
  // |          |/        |/
  // 4 ======== 5         -------> x
  //

  // Check setup
  EXPECT_EQ(18u, mesh_.n_edges() )     << "Wrong number of Edges";
  EXPECT_EQ(36u, mesh_.n_halfedges() ) << "Wrong number of HalfEdges";
  EXPECT_EQ(8u, mesh_.n_vertices() )   << "Wrong number of vertices";
  EXPECT_EQ(12u, mesh_.n_faces() )     << "Wrong number of faces";


  // Run over all halfedges
  unsigned int heCounter = 0;

  mesh_.request_face_status();
  mesh_.request_vertex_status();
  mesh_.request_halfedge_status();

  // Get second edge
  Mesh::EdgeHandle eh = mesh_.edge_handle(2);

  // Delete one edge
  mesh_.delete_edge(eh);

  // Check setup ( No garbage collection, so nothing should change!)
  EXPECT_EQ(18u, mesh_.n_edges() )     << "Wrong number of Edges after delete";
  EXPECT_EQ(36u, mesh_.n_halfedges() ) << "Wrong number of HalfEdges after delete";
  EXPECT_EQ(8u, mesh_.n_vertices() )   << "Wrong number of vertices after delete";
  EXPECT_EQ(12u, mesh_.n_faces() )     << "Wrong number of faces after delete";

  Mesh::HalfedgeIter he_it  = mesh_.halfedges_sbegin();
  Mesh::HalfedgeIter he_end = mesh_.halfedges_end();

  EXPECT_EQ(0,  he_it.handle().idx()) << "Wrong start index in halfedge iterator";
  EXPECT_EQ(36, he_end.handle().idx()) << "Wrong end index in halfedge iterator";


  // =====================================================
  // Check skipping iterator
  // =====================================================
  bool ok_4 = true;
  bool ok_5 = true;

  unsigned int count = 0;

  while (he_it != he_end) {
    if ( he_it.handle().idx() ==  4 )
      ok_4 = false;

    if ( he_it.handle().idx() ==  5 )
      ok_5 = false;

    ++he_it;
    ++count;
  }

  EXPECT_EQ(34u,count) << "Skipping iterator count error";
  EXPECT_TRUE( ok_4 )  << "Skipping iterator hit deleted halfedge 4";
  EXPECT_TRUE( ok_5 )  << "Skipping iterator hit deleted halfedge 5";

  // =====================================================
  // Check non skipping iterator
  // =====================================================
  he_it  = mesh_.halfedges_begin();

  count = 0;
  ok_4 = false;
  ok_5 = false;

  while (he_it != he_end) {
    if ( he_it.handle().idx() ==  4 )
      ok_4 = true;

    if ( he_it.handle().idx() ==  5 )
      ok_5 = true;


    ++he_it;
    ++count;
  }

  EXPECT_EQ(36u,count) << "Non-skipping iterator count error";
  EXPECT_TRUE( ok_4 )  << "Non-skipping iterator missed deleted halfedge 4";
  EXPECT_TRUE( ok_5 )  << "Non-skipping iterator missed  deleted halfedge 5";
}

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/*
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 * Test with a mesh with one deleted face
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 */
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TEST_F(OpenMeshIterators, FaceIterEmptyMeshOneDeletedFace) {
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  mesh_.clear();

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  // request delete_face capability
  mesh_.request_vertex_status();
  mesh_.request_edge_status();
  mesh_.request_face_status();
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  // Add some vertices
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  Mesh::VertexHandle vhandle[4];
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  vhandle[0] = mesh_.add_vertex(Mesh::Point(0, 0, 0));
  vhandle[1] = mesh_.add_vertex(Mesh::Point(0, 1, 0));
  vhandle[2] = mesh_.add_vertex(Mesh::Point(1, 1, 0));
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  // Add two faces
  std::vector<Mesh::VertexHandle> face_vhandles;

  face_vhandles.push_back(vhandle[2]);
  face_vhandles.push_back(vhandle[1]);
  face_vhandles.push_back(vhandle[0]);
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  Mesh::FaceHandle fh = mesh_.add_face(face_vhandles);
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  // Delete face but keep vertices
  bool const is_delete_isolated_vertex = false;
  mesh_.delete_face(fh, is_delete_isolated_vertex);
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  // Test setup (Face deleted but vertices kept.
  //  1 === 2
  //  |   /
  //  |  /
  //  | /
  //  0
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  Mesh::FaceIter f_it  = mesh_.faces_begin();
  Mesh::FaceIter f_end = mesh_.faces_end();
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  EXPECT_EQ(0, f_it.handle().idx()) << "Wrong start index in FaceIterator";
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  EXPECT_EQ(1, f_end.handle().idx()) << "Wrong end index in FaceIterator";
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  ++f_it;
  EXPECT_EQ(1, f_it.handle().idx()) << "Wrong end index in FaceIterator after one step";
  EXPECT_TRUE(f_it == f_end ) << "Iterator not at end for FaceIterator after one step";
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  Mesh::ConstFaceIter cf_it  = mesh_.faces_begin();
  Mesh::ConstFaceIter cf_end = mesh_.faces_end();
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  EXPECT_EQ(0, cf_it.handle().idx()) << "Wrong start index in ConstFaceIterator";
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  EXPECT_EQ(1, cf_end.handle().idx()) << "Wrong end index in ConstFaceIterator";
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  ++cf_it;
  EXPECT_EQ(1, cf_it.handle().idx()) << "Wrong end index in ConstFaceIterator after one step";
  EXPECT_TRUE(cf_it == cf_end ) << "Iterator not at end for ConstFaceIterator after one step";
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  // Same with skipping iterators:
  f_it  = mesh_.faces_sbegin();
  f_end = mesh_.faces_end();
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  EXPECT_EQ(1, f_it.handle().idx()) << "Wrong start index in FaceIterator with skipping";
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  EXPECT_EQ(1, f_end.handle().idx()) << "Wrong end index in FaceIterator with skipping";
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  EXPECT_TRUE(f_it == f_end ) << "Iterator not at end for FaceIterator with skipping";
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  // Same with skipping iterators:
  cf_it  = mesh_.faces_sbegin();
  cf_end = mesh_.faces_end();
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  EXPECT_EQ(1, cf_it.handle().idx()) << "Wrong start index in ConstFaceIterator with skipping";
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  EXPECT_EQ(1, cf_end.handle().idx()) << "Wrong end index in ConstFaceIterator with skipping";
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  EXPECT_TRUE(cf_it == cf_end ) << "Iterator not at end for ConstFaceIterator with skipping";
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  mesh_.release_vertex_status();
  mesh_.release_edge_status();
  mesh_.release_face_status();
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}
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#endif // INCLUDE GUARD