Software Engineering and Computer Games

22.3. Defining a new class

Just to show that making a class doesn’t need to be hard, let’s do the absolute simplest implementation of, say, a cDisk that represents a circle. Suppose we assume that we specify the circle by a cVector center, a Real radius, and a COLORREF fillcolor.

For a class which has simple fields as members, C++ defines an appropriate default no-argument constructor, a default copy constructor, a default overloaded operator=, and a default destructor. The default constructor allocates space for the data fields but doesn’t initialize them, the default copy constructor and operator= copy the data from one object to another field by field, and the default destructor simply frees up the space used by a class object. (As an aid ...