The C++ Programming Language by Stroustrup Bjarne

Author:Stroustrup, Bjarne.
Language: eng
Format: epub
Publisher: Pearson Education Limited (US titles)
Published: 2013-04-12T04:00:00+00:00

21.2. Design of Class Hierarchies

Consider a simple design problem: Provide a way for a program (“an application”) to get an integer value from a user. This can be done in a bewildering number of ways. To insulate our program from this variety, and also to get a chance to explore the possible design choices, let us start by defining our program’s model of this simple input operation.

The idea is to have a class Ival_box (“integer value input box”) that knows what range of input values it will accept. A program can ask an Ival_box for its value and ask it to prompt the user if necessary. In addition, a program can ask an Ival_box if a user changed the value since the program last looked at it:

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