7.1.1. Designing the Sales_data Class

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Ultimately, we want Sales_data to support the same set of operations as the Sales_item class. The Sales_item class had one member function1.5.2, p. 23), named isbn, and supported the +, =, +=, <<, and >> operators.

We’ll learn how to define our own operators in Chapter 14. For now, we’ll define ordinary (named) functions for these operations. For reasons that we will explain in § 14.1 (p. 555), the functions that do addition and IO will not be members of Sales_data. Instead, we’ll define those functions as ordinary functions. The function that handles compound assignment will be a member, and for reasons ...

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