Navigating C++ and Object-Oriented Design

13.8. Putting It All Together

A RintError Exception Hierarchy

In Section 7.4 on page 329, we introduced a range integer class (Rint) with overloaded operators. Recall that range integers are built with an initial value, a minimum, and a maximum.

Rint i(5, 1, 10);            // value=5, min=1, max=10 
i = 8;                       // OK
i = 88;                      // error

An overloaded assignment operator verifies that a range integer maintains its value within a specified range. Likewise, a constructor verifies that Rint objects have been built properly.

Rint j(5, 10, 1);            // error, max > min 
Rint k(55, 1, 10);           // error, initial value not within range

Error handling with Rint is minimal, using one exception class to handle all possible errors (see Listing 7.6 on page 331). An exception hierarchy ...