IO library: make counter methods non virtual and make access to its member variables private, as this class has no sub classes at the moment and this will very unlikely change in the future.
IO library: make counter methods non virtual and make access to its member variables private, as this class has no sub classes at the moment and this will very unlikely change in the future.

quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs