Figure 182 Illustration of a CachedObj Derived Class C++ Primer, Fourth Edition in .NET

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Figure 182 Illustration of a CachedObj Derived Class C++ Primer, Fourth Edition
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By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912
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Table of Contents | Index
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help 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 TheCachedObj Class 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 The only remaining question is what types to use for the pointers in CachedObj We'd like to language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes use the freelist approach for any type, so the class will be a template The pointers will point it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten to an object of the template type: 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,/* memory allocation class: Pre-allocates objects and usage tips Complete with exercises that reinforce skills suggest good programming practices, and provide general learned Authoritative andfreelist of objects that are unused source code for the book's extended examples is available on * maintains a comprehensive in its coverageThe the Web * the address below freed, it is put back on the freelist at When an object is
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* The memory is only returned when the program exits */ template <class T> class CachedObj { public: void *operator new(std::size_t); void operator delete(void *, std::size_t); virtual ~CachedObj() { } protected: T *next; private: static void add_to_freelist(T*); static std::allocator<T> alloc_mem; static T *freeStore; static const std::size_t chunk; };
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The class is quite simple It provides only three public members: operator new, operator delete, and a virtual destructor The new and delete members take objects off and return objects to the freelist Thestatic members manage the freelist These members are declared as static because there is only one freelist maintained for all the objects of a given type The freeStore pointer points to the head of the freelist The member named chunk specifies the number of objects that will be allocated each time the freelist is empty Finally, add_to_freelist puts objects on the freelist This function is used by operator new to put newly allocated objects onto the freelist It is also used by operator delete to put an object back on the free list when an object is deleted
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UsingCachedObj
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The only really tricky part Fourth Edition C++ Primer, in using CachedObj is understanding the template parameter: When we inherit from CachedObj, the template type we use to instantiate CachedObj will be the By Stanley B Lippman,Jos e Lajoie, derived type itself We inherit from CachedObj in order to reuse its freelist management Barbara E Moo However,CachedObj holds a pointer to the object type it manages The type of that pointer is pointer to a type derived from CachedObj
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Publisher:Addison Wesley Professional For example, to optimize memory management for our Screen class we would declare Screen Pub Date: February 14, 2005 as Print ISBN: 0-201-72148-1 Pages: 912
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