As a gradual improvement I would suggest an encapsulation of these two member variables into one:
i.e. using boost::optional<unsigned long> last_consuned;
But Alexandros proposal for (2) is nicer.
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As a gradual improvement I would suggest an encapsulation of these two member variables into one:
i.e. using boost:: optional< unsigned long> last_consuned;
But Alexandros proposal for (2) is nicer.