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wo of the cornerstones of OOP are inheritance and polymorphism Inheritance is important because it allows the creation of hierarchical classifications Using inheritance, you can create a general class that defines traits common to a set of related items This class can then be inherited by other, more specific classes, each adding only those things that are unique to the derived class Inheritance was introduced in 20 It is examined in detail, here Inheritance is also important for another reason: it is used to support run-time polymorphism Polymorphism is sometimes characterized by the phrase one interface, multiple methods This means that a general class of operations can be accessed in the same fashion even though the specific actions associated with each operation may differ In C++, polymorphism is supported both at run time and at compile time Operator and function overloading are examples of compile-time polymorphism However, as powerful as operator and function overloading are, they cannot perform all tasks required by a true, object-oriented language Therefore, C++ also allows run-time polymorphism through the use of derived classes (ie, inheritance) and virtual functions, both of which are discussed in this chapter

In this section we will explore the interplay between C++ s access specifiers and inheritance Before beginning, let s review terminology A class that is inherited by another class is called the base class Sometimes it is also referred to as the parent class or the superclass The class that does the inheriting is called the derived class, sometimes called the child class or subclass This book uses the terms base and derived because they are the traditional terms

.

private void listViewMain_ItemActivate (object sender, System.EventArgs e) { if (_albumsShown && listViewMain.SelectedItems.Count > 0) { ListViewItem item = listViewMain.SelectedItems[0]; string fileName = item.Tag as string; // Open the album for this item PhotoAlbum album = null; if (fileName != null) album = OpenAlbum(fileName); if (album == null) { MessageBox.Show("The photographs for " + "this album cannot be displayed."); return; }

In C++, a class can categorize its members into three classifications: public, private, or protected A public member can be accessed by any other function in the program A private member can be accessed only by member or friend functions of its class A protected member is similar to a private member, except where inheritance is concerned When one class inherits another class, all public members of the base class become public members of the derived class and are, therefore, accessible to the derived class However, all private members of the base class remain private to that class and are inaccessible to the derived class For example, in the following fragment

// Switch to a photograph view LoadPhotoData(album); } }

class X { int i; int j; public:

ignore the behemoth industry in the hills of Los Angeles On June 20, 2002, Circuit City, the largest electronics retailer in the US, became the first major VHS retailer to announce that it was eliminating VHS movies from its stores to make room for faster-selling DVDs In August, Toshiba and NEC formally proposed their blue-laser optical disc format, now called Advanced Optical Disc (AOD), to the DVD Forum The AOD format was twice voted down in meetings of the DVD Forum Steering Committee, with Blu-ray supporters mostly voting against or abstaining (which had the effect of a no vote) In November 2002, amidst charges of anti-trust behavior against the Blu-ray companies that had blocked previous votes, the DVD Forum voting rules were changed (so that abstentions no longer counted) and AOD was finally approved by the DVD Forum Steering Committee It was later renamed to HD DVD Also in November, the Chinese government announced that enhanced versatile disc (EVD), a project that started in 1999 and experienced several cancelled launches, would be launched by Christmas 2003 EVD had been created as an alternative to DVD in part to decrease the flow of licensing royalties to Japan and other DVD patent holders The plan was for EVD to use a new optical disc format and compression technologies developed in China, but the anticipated new technologies were too slow in coming, so the format ended up using red-laser DVD, flirted with proprietary video compression technologies (VP5 and VP6, developed by On2 in the US), and finally settled on MPEG-2 The EVD format supported HD video resolutions, including 1280 720 at 60 fps progressive (720p) and 1920 1080 at 30 fps interlaced (1080i) In April 2004, another group led by Amlogic and several major Chinese television manufacturers, announced development of the HVD format, and in May the DVD Forum began investigating a proposal from the Industrial Research Technology Institute (ITRI) of Taiwan for the FVD (forward versatile disc) format, intended specifically for the low-cost Chinese market In October, prototypes of both dueling blue-laser formats were unveiled at the Ceatec exhibition in Tokyo Sony, Panasonic, Sharp, Pioneer, and JVC showed prototype Blu-ray Disc recorders while Toshiba showed an AOD prototype.