COMP: vtkIdList::IntersectWith(vtkIdList &) should be "vtkIdList *"

This must be a holdover from long, long ago when VTK used references
instead of pointers for VTK objects.

Common/vtkIdList.cxx

@@ -185,7 +185,7 @@ vtkIdType *vtkIdList::Resize(const vtkIdType sz)
 #define VTK_TMP_ARRAY_SIZE 500
 // Intersect this list with another vtkIdList. Updates current list according
 // to result of intersection operation.
-void vtkIdList::IntersectWith(vtkIdList& otherIds)
+void vtkIdList::IntersectWith(vtkIdList* otherIds)
 {
   // Fast method due to Dr. Andreas Mueller of ISE Integrated Systems 
   // Engineering (CH).
@@ -203,7 +203,7 @@ void vtkIdList::IntersectWith(vtkIdList& otherIds)
     for (this->Reset(), i=0; i < thisNumIds; i++) 
       {
       vtkid = thisIds[i];
-      if ( otherIds.IsId(vtkid) != (-1) )
+      if ( otherIds->IsId(vtkid) != (-1) )
         {
         this->InsertNextId(vtkid);
         }
@@ -221,7 +221,7 @@ void vtkIdList::IntersectWith(vtkIdList& otherIds)
     for (this->Reset(), i=0; i < thisNumIds; i++) 
       {
       vtkid = *(thisIds + i);
-      if ( otherIds.IsId(vtkid) != (-1) )
+      if ( otherIds->IsId(vtkid) != (-1) )
         {
         this->InsertNextId(vtkid);
         }

Common/vtkIdList.h

@@ -100,7 +100,13 @@ public:
   // Description:
   // Intersect this list with another vtkIdList. Updates current list according
   // to result of intersection operation.
-  void IntersectWith(vtkIdList& otherIds);
+  void IntersectWith(vtkIdList* otherIds);
+
+  //BTX
+  // This method should become legacy
+  void IntersectWith(vtkIdList& otherIds) {
+    return this->IntersectWith(&otherIds); };
+  //ETX
 
 protected:
   vtkIdList();