Reply To: Modifying field values for neighboring cells inside a postprocessor
Note that this is neither platform transparent nor memory save as the cell classes are only interfaces that are not permanently stored. What you want to do is store the cell IDs. (See the core section of the user guide)
I assume you want to preserve the queue across operator applications? If so you will need to pass a pointer to it as Parameter / use global data and take care of the parallel accesses yourself.