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Table of Contents | Index
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Our handle has two constructors: the default constructor, which creates an un-bound Sales_item, and a second constructor, which takes an object to which it attaches the handle The first constructor is easy: We set the Item_base pointer to 0 to indicate that this handle is not attached to introduction to standard C++ has been completely updated, use counter and initializes it to 1 any object The constructor allocates a new reorganized, and rewritten to help This popular tutorial The second constructor is more difficult We'd like users of our handle to create their own edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving objects, to which they could attach a handle The constructor will allocate a new object of the readers the means to write useful programs without first having to master every language detail Highlighting today's best appropriate type and copy the parameter into that newly allocated object That way the practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance Sales_item class will own the object and can guarantee that the object is not deleted until the Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the lastSales_item attached to the object goes away
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language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming styles and program design techniques Filled with new learning aids that emphasize important points, warn about common pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills learned Authoritative and comprehensive in its coverageThe source code for must first solve a problem: We do To implement the constructor that takes an Item_base, wethe book's extended examples is available on the know the actual type not Web at the address below of the object that the constructor is given We know that it is an programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last
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1582 Cloning an Unknown Type
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Item_base or an object of a type derived from Item_base Handle classes often need to allocate
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a new copy of an existing object without knowing the precise type of the object Our Sales_item constructor is a good example
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The common approach to solving this problem is to define a virtual operation to do the copy, which we'll name clone
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To support our handle class, we'll need to add clone to each of the types in the hierarchy, starting with the base class, which must define the function as virtual:
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class Item_base { public: virtual Item_base* clone() const { return new Item_base(*this); } };
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Each class must now redefine the virtual Because the function exists to generate a new copy of an object of the class, we'll define the return type to reflect the type of the class itself:
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class Bulk_item : public Item_base { public: Bulk_item* clone() const C++ Primer, Fourth Edition { return new Bulk_item(*this); } By Stanley B Lippman,Jos e Lajoie, };
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Barbara E Moo Publisher:Addison Wesley On page 564 weProfessionalis one exception to the requirement that the return type of the said there Pub Date: exactly 14, of the derived class must matchFebruary that2005 base class instance That exception supports Print ISBN: 0-201-72148-1 cases such as this one If the base instance of a virtual function returns a reference or pointer Pages: 912 to a class type, the derived version of the virtual may return a class publicly derived from the
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