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When a virtual function that is not overridden in a derived class is called for an object of that derived class, the version of the function as defined in the base class is used However, in many circumstances there is no meaningful definition of a virtual function inside the base class For example, in the base class figure, used in the preceding example, the definition of show_area( ) is simply a placeholder It does not compute and display the area of any type of object There are two ways you can handle this situation One way is to simply have it report a warning message, as shown in the example While this approach can be useful in certain situations, it is not appropriate for all circumstances There can be virtual functions that must be defined by the derived class in order for the derived class to have any meaning For example, the class triangle has no meaning if show_area( ) is not defined In this sort of case, you want some method to ensure that a derived class does, indeed, define all necessary functions C++ s solution to this problem is the pure virtual function A pure virtual function is a function declared in a base class that has no definition relative to the base Since it has no definition relative to the base, any derived type must define its own version it cannot simply use the version defined in the base To declare a pure virtual function, use this general form: virtual type func_name(parameter list) = 0; where type is the return type of the function and func_name is the name of the function For example, in the following version of figure, show_area( ) is a pure virtual function:

The TreeView class is a close cousin of the ListView class. List views display a collection as a list, while tree views display collections as a tree. Each item in a tree view is called a tree node, or just a node. Tree nodes can contain additional nodes, called child nodes, to arbitrary levels in order to represent a hierarchy of objects in a single control. Various elements of a TreeView control are illustrated in figure 15.1.

class figure { double x, y; public: void set_dim(double i, double j=0) { x = i; y = j; } virtual void show_area() = 0; // pure } ;

An icon taken from an ImageList instance is associated with each node. An alternate icon from the ImageList can be displayed when a node is selected.

By declaring a virtual function as pure, you force any derived class to define its own implementation If a class fails to do so, a compile-time error results For example, if you try to compile this modified version of the figure program, in which the definition for show_area( ) has been removed from the circle class, you will see an error message:

264 352 136 47,872 264 352 163 57,376

Figure 15.1 The TreeView control automatically shows the entire label in a tool tip style format when the mouse hovers over a node, as was done for the From the Walking Path entry in this figure.

23:

isalnum( ), isdigit( ), iscntrl( ), isgraph( ), isprint( ), ispunct( ), isspace( )

The explorer-style interface shown in the figure and used by other applications such as Windows Explorer is a common use of the TreeView and ListView classes. In this chapter we build such an interface by extending the MyAlbumExplorer project constructed in chapter 14.

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int isascii(int ch)

The TreeView class is summarized in.NET Table 15.1. Like the ListView class, this class inherits directly from the Control class, and provides an extensive list of members for manipulating the objects displayed by the tree.

The prototype for isascii( ) is found in <ctypeh> and is not defined by the ANSI/ISO C/C++ standard The isascii( ) macro returns non-0 if ch is in the range 0 through 0x7F; otherwise, it returns 0

This program checks each character read from stdin and reports all those that are defined by ASCII:

The TreeView class represents a control that displays a collection of labeled items as a treestyle hierarchy Typically an icon is displayed for each item in the collection to provide a graphical indication of the nature or purpose of the item Items in the tree are referred to as nodes, and each node is represented by a TreeNode class instance This class is part of the SystemWindowsForms namespace, and inherits from the Control class See NET Table 41 on page 104 for a list of members inherited by this class CheckBoxes HideSelection ImageIndex ImageList LabelEdit Nodes Public Properties PathSeparator SelectedNode ShowPlusMinus Gets or sets whether check boxes are displayed next to each node in the tree The default is false Gets or sets whether a selected node remains highlighted even when the control does not have focus.

DVD (185)

#include <ctypeh> #include <stdioh> int main(void) { char ch; for(;;) { ch = getchar(); if(ch==' ') break; if(isascii(ch)) printf("%c is ASCII defined\n", ch); } return 0; }