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The InitTreeData method is called, which does the following: a Creates and selects the top level node, b Creates tree nodes for each album in the default album directory. As a result of selecting the top-level node, the treeViewMain_After-Select event handler is called, which does the following: a Calls LoadAlbumData to populate the ListView control. Back in the OnLoad method, the LoadAlbumData method is called to initialize the ListView control.

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Clearly the second call to LoadAlbumData is no longer required, so we can remove it from our program.

his chapter discusses several of C++ s most advanced features: templates, exceptions, run-time type ID (RTTI), and the casting operators Using a template, it is possible to create generic functions and generic classes In a generic function or class, the type of data upon which the function or class operates is specified as a parameter Thus, you can use one function or class with several different types of data without having to explicitly recode specific versions for different data types Exception handling allows you to handle run-time errors in a structured and controlled manner The principal advantage of exception handling is that it automates much of the error-handling code that previously had to be implemented by hand in any large program Run-time type identification (RTTI) lets you determine the actual type of an object at run time You can also test if an object is of a particular type or if two objects are of the same type Also discussed in this chapter are four casting operators: const_cast, dynamic_cast, reinterpret_cast, and static_cast These casting operators give you fine-grained control over type casting

UPDATE THE ONLOAD METHOD Action 7 Modify the OnLoad method to only initialize the TreeView control. Result

A generic function defines a general set of operations that will be applied to various types of data Using this mechanism, the same general procedure can be applied to a wide range of data As you probably know, many algorithms are logically the same no matter what type of data is being operated upon For example, the Quicksort sorting algorithm is the same whether it is applied to an array of integers or an array of floats It is just that the type of the data being sorted is different By creating a generic function, you can define, independent of any data, the nature of the algorithm Once this is done, the compiler automatically generates the correct code for the type of data that is actually used when you execute the function In essence, when you create a generic function you are creating a function that can automatically overload itself A generic function is created with the keyword template The normal meaning of the word template accurately reflects its use in C++ It is used to create a template (or framework) that describes what a function will do, leaving it to the compiler to fill in the details, as needed The general form of a template function definition is shown here: template <class Ttype> ret-type func-name(parameter list) { // body of function } Here, Ttype is a placeholder name for a data type used by the function This name can be used within the function definition However, it is only a placeholder that the

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A common programming construct is the if-else-if ladder, sometimes called the if-else-if staircase because of its appearance Its general form is if (expression) statement; else if (expression) statement; else if (expression) statement;

protected override void OnLoad(EventArgs e) { . . . // Initialize the contents of the form InitTreeData(); }

else statement; The conditions are evaluated from the top downward As soon as a true condition is found, the statement associated with it is executed and the rest of the ladder is bypassed If none of the conditions are true, the final else is executed The final else often acts as a default condition; that is, if all other conditional tests fail, the last else statement is performed If the final else is not present, then no action takes place if all other conditions are false Using an if-else-if ladder, the magic number program becomes