message: boundary_in does not work
diff: @@ -395,10 +395,10 @@ namespace RINGMesh {
  return 1 ;
  }
  - virtual const Line& in_boundary( index_t x ) const
  + /*virtual const Line& in_boundary( index_t x ) const
  {
  return static_cast< const Line& >( GeoModelMeshEntity::in_boundary( x ) ) ;
  - }
  + }*/
  /*! @}
  * \name Geometrical request on Corner
  @@ -504,11 +504,11 @@ namespace RINGMesh {
  return static_cast< const Corner& >( GeoModelMeshEntity::boundary( x ) ) ;
  }
  - virtual const Surface& in_boundary( index_t x ) const
  + /*virtual const Surface& in_boundary( index_t x ) const
  {
  return static_cast< const Surface& >( GeoModelMeshEntity::in_boundary(
  x ) ) ;
  - }
  + }*/
  virtual bool is_connectivity_valid() const final ;
  @@ -661,10 +661,10 @@ namespace RINGMesh {
  return static_cast< const Line& >( GeoModelMeshEntity::boundary( x ) ) ;
  }
  - virtual const Region& in_boundary( index_t x ) const
  + /*virtual const Region& in_boundary( index_t x ) const
  {
  return static_cast< const Region& >( GeoModelMeshEntity::in_boundary( x ) ) ;
  - }
  + }*/
  bool is_simplicial() const
  {
  