By R. J. Mitchell (auth.)
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Additional info for C++ Object-Oriented Programming
Second, the class can have another as a member variable; in the drawing package the keyboard buffer object, which stores keystrokes in an array configured as a circular buffer, contains other objects which provide indices into the buffer. Third, a class can have a pointer to another class as a member variable; in the package, an item which specifies that a user shape is to be drawn contains a pointer to that shape. Also, when a list is displayed from which the user can make a selection, that list is shown in a GWindow; thus the selection object has a pointer to the appropriate window.
This was tested with the initial version of DIAGCOMM, in which only a few commands were implemented. The LINEEDIT utility was then written, tested separately, and then integrated with the package. The following stage was to consider the main objects of the program, that is those which define lines, circles, strings, etc. First the Basicltem, Lineltem and Rectltem were defined, and functions for drawing and editing them were written and tested. Next, the linked list structure for items was written, and tested by providing a command which redrew the diagram: to do this the linked list must exist and the program must be able to progress along that list.
Similarly, there are separate libraries for each of the classes for the keyboard, the mouse and the keyboard (and mouse) buffers. Thus, in some cases there is a single level of subsystem and in others there is a hierarchy. For example, the keyboard/mouse buffer library module uses the mouse and keyboard modules. Inten:u:tion between subsystsms The interface between these subsystems must also be considered. This specifies the form of all interactions and the information flow across boundaries, and does not specify how each subsystem is implemented internally.