Defining the Nested Class Outside the Enclosing Class in Visual Studio .NET

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Defining the Nested Class Outside the Enclosing Class
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Nested classes often support implementation details for the enclosing class We might want to prevent users of the enclosing class from seeing the code that implements the nested class For example, we might want to put the definition of class QueueItem in its own file, which we would include in those files containing the implementation of the Queue class and its members Just as we can define the members of a nested class outside the class body, we can define the entire class outside the body of the enclosing class:
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template <class Type> class Queue { // interface functions to Queue are unchanged
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private: struct QueueItem; // forward declaration of nested typeQueueItem QueueItem *head; // pointer to first element inQueue C++ Primer, Fourth QueueItem *tail; Edition // pointer to last element inQueue By Stanley B Lippman,Jos e Lajoie, }; template Barbara E Moo <class Type> struct Queue<Type>::QueueItem { Publisher:Addison Wesley QueueItem(const Type &t): item(t), next(0) { } Type Professional item; // value stored in this element Pub Date: February pointer to QueueItem *next; // 14, 2005 next element in theQueue Print ISBN: 0-201-72148-1 };
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Pages: 912
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Table of Contents | Index
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To define the class body outside its enclosing class, we must qualify the name of the nested class by the name of its enclosing C++ has Notecompletely updated,still declare QueueItem in the body This popular tutorial introduction to standard class been that we must reorganized, and rewritten to help of class Queue the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last programmers learn A nested class also can be declared and then later defined in the body of the enclosing class readers the means to write useful programs without first having to master every language detail Highlighting today's best As with other forward declarations, a forward declaration of a nested class allows for nested practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance classes that have members that refer to one another
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edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving
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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 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 that is defined outside reinforce skills Until the actual definition of a nested class Complete with exercises that learned Authoritative and comprehensive in its coverageThe sourcean incomplete type (Section is available on the class body is seen, that class is code for the book's extended examples the Web at the address below 437) All the normal retrictions on using an incomplete 1214, p
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type apply
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Nested-Class Static Member Definitions
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IfQueueItem had declared a static member, its definition would also need to be defined in the outer scope Assuming QueueItem had a static member, its definition would look somthing like:
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// defines anint static member of QueueItem, // which is a type nested inside Queue<Type> template <class Type> int Queue<Type>::QueueItem::static_mem = 1024;
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Using Members of the Enclosing Class
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There is no connection between the objects of an enclosing scope and objects of its nested type(s)
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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Professional Pub Date: February 14, 2005 Nonstatic functions in the nested class have an implicit this pointer that points to an object of Print ISBN: 0-201-72148-1 the nested typePages: 912 A nested-type object contains only the members of the nested type The
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