C++ Primer, Fifth Edition

7.3.1. Class Members Revisited

To explore several of these additional features, we’ll define a pair of cooperating classes named Screen and Window_mgr.

Defining a Type Member

A Screen represents a window on a display. Each Screen has a string member that holds the Screen’s contents, and three string::size_type members that represent the position of the cursor, and the height and width of the screen.

In addition to defining data and function members, a class can define its own local names for types. Type names defined by a class are subject to the same access controls as any other member and may be either public or private:

class Screen {public:    typedef std::string::size_type pos;private:    pos cursor = 0;    pos height = 0, width = 0;    std::string ...