Merge topic 'iterator-newinstance' into release

6f54b402 Avoid leaks by hinting NewIterator methods

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !5353

Common/DataModel/vtkDataSet.h

@@ -103,6 +103,7 @@ public:
   /**
    * Return an iterator that traverses the cells in this data set.
    */
+  VTK_NEWINSTANCE
   virtual vtkCellIterator* NewCellIterator();
 
   /**

Common/DataModel/vtkGenericAdaptorCell.h

@@ -202,6 +202,7 @@ public:
    * Create an empty cell iterator. The user is responsible for deleting it.
    * \post result_exists: result!=0
    */
+  VTK_NEWINSTANCE
   virtual vtkGenericCellIterator *NewCellIterator()=0;
 
   /**

Common/DataModel/vtkGenericDataSet.h

@@ -123,6 +123,7 @@ public:
    * \pre valid_dim_range: (dim>=-1) && (dim<=3)
    * \post result_exists: result!=0
    */
+  VTK_NEWINSTANCE
   virtual vtkGenericCellIterator *NewCellIterator(int dim=-1) = 0;
 
   /**
@@ -134,6 +135,7 @@ public:
    * \pre valid_dim_range: (dim>=-1) && (dim<=2)
    * \post result_exists: result!=0
    */
+  VTK_NEWINSTANCE
   virtual vtkGenericCellIterator *NewBoundaryIterator(int dim=-1,
                                                       int exteriorOnly=0) = 0;
 
@@ -143,6 +145,7 @@ public:
    * The user is responsible for deleting the iterator.
    * \post result_exists: result!=0
    */
+  VTK_NEWINSTANCE
   virtual vtkGenericPointIterator *NewPointIterator()=0;
 
   /**