I define an enum in class PeriodicalItem; there is also a enum type varaible in this class:
//PeriodicalItem .h
Code:
class PeriodicalItem {
public:
enum Regularity { Daily, Weekly, Fortnightly, Monthly, BiMonthly, Quarterly, TriAnnual, BiAnnual, Annual };
public:
PeriodicalItem(const string &title, const string &call_number, const Regularity &published);