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Aside from the assignment operator, which we leave as an exercise, the only remaining function to write is copy_elems This function is designed to be used by the assignment operator and copy constructor Its job is to copy the elements from its parameter into this Queue:
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template Barbara E Moo <class Type> void Queue<Type>::copy_elems(const Queue &orig) { Publisher:Addison Wesley Professional // copy elements from originto thisQueue Pub Date: February 14, 2005 // loop stops whenpt == 0, which happens when we reach origtail Print ISBN: 0-201-72148-1 for (QueueItem<Type> *pt = orighead; pt; pt = pt->next) Pages: 912 push(pt->item); // copy the element } Table of Contents | Index
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We copy the elements in a for loop that starts by setting pt equal to the parameter's head pointer programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last Thefor continues until pt is 0, which happens after we get to the element that is the last one in edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving orig For each element in orig, we push a copy of value in that element onto this Queue and readers the means to write useful programs without first having to master every language detail Highlighting today's best advancept to point to the next element in orig
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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 Instantiation ofeven for more experiencedMember Functions and More Effectively with This Rewritten it a valuable resource Class-Template programmersProgram Faster Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming Member program design techniques Filled with are learning aids that emphasize important points, warn about common styles and functions of class templates new themselves function templates Like any other function template, a member function of a class template is used to generate instantiations of that pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills member Unlike and comprehensivetemplates, the source code for the book's extended examples is available on learned Authoritative other function in its coverageThe compiler does not perform template-argument deduction when instantiating class template member functions Instead, the template parameters the Web at the address below
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help
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of a class template member function are determined by the type of the object on which the call is made For example, when we call the push member of an object of type Queue<int>, the push function that is instantiated is
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void Queue<int>::push(const int &val)
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The fact that member-function template parameters are fixed by the template arguments of the object means that calling a class template member function is more flexible than comparable calls to function templates Normal conversions are allowed on arguments to function parameters that were defined using the template parameter:
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Queue<int> qi; // instantiates class Queue<int> short s = 42; int i = 42; // ok: sconverted to int and passed to push qipush(s); // instantiatesQueue<int>::push(const int&) qipush(i); // usesQueue<int>::push(const int&) f(s); // instantiatesf(const short&) f(i); // instantiatesf(const int&)
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When Classes and Members Are Instantiated
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Member functions of a class template are instantiated only for functions that are used by the program If a function is never used, then that member function is never instantiated This behavior implies that types used to instantiate a template need to meet only the requirements of
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the operations that are actually used As an example, recall the sequential container constructor (Section 911, p 309) that takes only a size parameter That constructor uses the default constructor for the element type If we have a type that does not define the default constructor, C++ Primer, Fourth Edition we may still define a container to hold this type However, we may not use the constructor that By takes only a size Stanley B Lippman,Jos e Lajoie,
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