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The TreeNode class represents a marshal by reference object that acts as an element, or a node, within a TreeView control. A TreeNode object can contain other nodes to represent a hierarchy of objects within a tree view. Contained nodes are called child nodes. A top-level node in a TreeView object is called a root node of the tree. Each TreeNode object can be contained by exactly one TreeView or TreeNode object. This class is part of the System.Windows.Forms namespace, and inherits from the System.MarshalByRefObject class. TreeNode Public Constructors Initializes a new TreeNode instance.

This program will not compile because the class circle does not override show_area() */ #include <iostream> using namespace std; class figure { protected: double x, y; public: void set_dim(double i, double j) { x = i; y = j; } virtual void show_area() = 0; // pure } ; class triangle : public figure { public: void show_area() { cout << "Triangle with height "; cout << x << " and base " << y; cout << " has an area of "; cout << x * 05 * y << "\n"; } }; class square : public figure { public: void show_area() { cout << "Square with dimensions "; cout << x << "x" << y; cout << " has an area of "; cout << x * y << "\n"; } }; class circle : public figure { // no definition of show_area() will cause an error }; int main()

{ figure *p; // create a pointer to base type circle c; // attempt to create a circle -- ERROR triangle t; // create objects of derived types square s; p = &t; p->set_dim(100, 50); p->show_area(); p = &s; p->set_dim(100, 50); p->show_area(); return 0; }

TreeNode(string label); TreeNode(string label, TreeNode[] childNodes); TreeNode(string label, int imageIndex, int selectedImageIndex);

If a class has at least one pure virtual function, that class is said to be abstract Abstract classes have one important feature: There can be no objects of that class Instead, an abstract class must be used only as a base that other classes will inherit The reason that an abstract class cannot be used to declare an object is that one or more of its member functions have no definition However, even if the base class is abstract, you still can use it to declare pointers or references, which are needed to support run-time polymorphism

Table B8 Video Resolution (continued)

FirstNode ImageIndex Index IsEditing IsExpanded IsSelected IsVisible Public Properties NextVisibleNode NodeFont Nodes Parent PrevNode SelectedImageIndex Tag Text BeginEdit Collapse Public Methods ExpandAll Toggle

There are two terms that are commonly used when discussing object-oriented programming languages: early binding and late binding Relative to C++, these terms refer to events that occur at compile time and events that occur at run time, respectively In object-oriented terms, early binding means that an object is bound to its function call at compile time That is, all information necessary to determine a function call is known when the program is compiled Examples of early binding include standard function calls, overloaded function calls, and overloaded operator function calls The principal advantage to early binding is efficiency it is both faster and often requires less memory than late binding Its disadvantage is a lack of flexibility

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