Question on Iterator model without having to setup a linked list

Hi,
I am trying to implement a subagent that gets data from an external data
manager. This external data manager has it's own cache and it only
provides interfaces to get and set data. I do not have direct access to
this linked list. I was hoping to avoid creating another linked list
just so the iterator model could iterate. In our case performance is not
an issue and so we would like to access data for every column and row,
every time, from the data manager interfaces. How can I implement
something like this without creating memory and setting up a linked list
? I am afraid the head pointer and loop context get confused if the next
pointer is not populated beforehand. Any ideas ? Thanks in advance.

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