23.4.7. Class BankDatabase
BankDatabase (Figs. 23.26–23.27) models the bank’s database with which the ATM interacts to access and modify a user’s account information. The class definition (Fig. 23.26) declares function prototypes for the class’s constructor and several member functions. We discuss these momentarily. The class definition also declares the
BankDatabase’s data members. We determine one data member for class
BankDatabase based on its composition relationship with class
Account. Recall from Fig. 23.10 that a
BankDatabase is composed of zero or more objects of class
Account. Line 24 of Fig. 23.26 implements data member
Account objects—to implement this composition relationship. Lines 6–7 allow us to use ...