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programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving readers the means to write useful programs without first having to master every language detail Highlighting today's best practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes In 15 we defined two handle classes: the Sales_item (Section 158, p 598) class and it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten theQuery (Section 159, p 607) class These classes managed pointers to objects in an Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming inheritance hierarchy Users of the handle did not have to manage the pointers to those styles and program design techniques Filled with new learning aids that emphasize important points, warn about common objects User code was written in terms of the handle class The handle dynamically allocated pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills and freed objects of the related inheritance classes and forwarded all "real" work back to the learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on classes in the underlying inheritance hierarchy the Web at the address below

These handles were similar to but different from each other: They were similar in that each defined use-counted copy control to manage a pointer to an object of a type in an inheritance hierarchy They differed with respect to the interface they provided to users of the inheritance hierarchy The use-counting implementation was the same in both classes This kind of problem is well suited to generic programming: We could define a class template to manage a pointer and do the use-counting Our otherwise unrelated Sales_item and Query types could be simplified by using that template to do the common use-counting work The handles would remain different as to whether they reveal or hide the underlying inheritance hierarchy In this section, we'll implement a generic handle class to provide the operations that manage the use count and the underlying objects Then we'll rewrite the Sales_item class, showing how it could use the generic handle rather than defining its own use-counting operations

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The problem with the Processing/P3D representation mentioned above is that, while objects do appear in the scene, they are not identifiable. For instance, suppose that one object is to be selected after it is created. This is not possible with the current code. There is no reference or memory of any drawn object in the scene. They are simply displayed on the screen. In order to establish an identity for each object in the scene, we need to create classes of 3D objects that will contain the information about their unique name, position, attributes, and transformations. Thus, we will construct a class called MyObject that will illustrate a partial solution to this problem.

Our Handle class will behave like a pointer: Copying a Handle will not copy the underlying object After the copy, both Handles will refer to the same underlying object To create a Handle, a user will be expected to pass the address of a dynamically allocated object of the type (or a type derived from that type) managed by the Handle From that point on, the Handle will "own" the given object In particular, the Handle class will assume responsibility for deleting that object once there are no longer any Handles attached to it Given this design, here is an implementation of our generic Handle:

/* generic handle class: Provides pointerlike behavior Although access through * an unboundHandle is checked and throws aruntime_error exception

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