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C++ Primer, Fourth Edition By overloaded arrow operator The Stanley B Lippman,Jos e Lajoie, must return either a pointer to a Barbara E or an class type Moo object of a class type that defines its own operator arrow 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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If the return type is a pointer, then the built-in arrow operator is applied to that pointer The compiler dereferences the pointer and fetches the indicated member from the resulting object If the type pointed to does not define that member, then the compiler generates an This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help error
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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 value is another object of They now introduce the C++ standard library from the beginning, the If the returnthe authors' approach to teaching it class type (or reference to such an object), thengiving readers the means to write useful programs without first having to master every language detail the object returned operator is applied recursively The compiler checks whether the type of Highlighting today's best practices, they show how to write if so, applies safe, operator Otherwise, the compiler generates has a member arrow and programs that arethat can be built quickly, and yet offer outstanding performance an Examples that take advantage of the library, either a pointer to C++, also show how to indicated use of the error This process continues untiland explain the features ofan object with themake the bestmember is language or its previous editions, the returned, in which case the code C++ error returned As insome other value isbook's authoritative discussion of fundamental is inconcepts 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 the book's extended examples is available on the Web at the address below
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Exercise 1420:
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In our sketch for the ScreenPtr class, we declared but did not define the assignment operator Implement the ScreenPtr assignment operator Define a class that holds a pointer to a ScreenPtr Define the overloaded arrow operator for that class A smart pointer probably should define the equality and inequality operators to test whether two pointers are equal or unequal Add these operations to the ScreenPtr class
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C++ Primer, Fourth Edition By Stanley B 147 IncrementLippman,Jos e Lajoie, and Decrement Operators Barbara E Moo Publisher:Addison Wesley The increment (++) and decrement (--) operators are most often implemented for classes, Professional such as iterators, that provide pointer like behavior on the elements of a sequence As an Pub Date: February 14, points example, we might define a class that2005 to an array and provides checked access to elements in thatPrint ISBN: 0-201-72148-1 array Ideally, our checked-pointer class could be used on arrays of any type, which we'll learnPages: to do in 16 when we cover class templates For now, our class how 912 will of Contents | Index Table handle arrays of int s:
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help * smart pointer: Checks access to elements throws an out_of_range programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last * exception if attempt to access a nonexistent element edition, so has theallocate and free theteaching it They now introduce the C++ standard library from the beginning, giving * users authors' approach to array 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 class CheckedPtr { Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the public: language As //itsno default constructor; CheckedPtrs must be bound to an object in 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 curr(b) { } CheckedPtr(int *b, int *e): beg(b), end(e), More Effectively with This Rewritten Classic Restructured for quicker learning, usingoperations // dereference and increment 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 private: pitfalls, suggest good beg; int* programming practices, to beginning of the array tips Complete with exercises that reinforce skills // pointer and provide general usage learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on int* end; // one past the end of the array the Web at the address below // current position within the array int* curr;
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LikeScreenPtr, this class has no default constructor We must supply pointers to an array when we create a CheckedPtr A CheckedPtr has three data members: beg , which points to the first element in the array; end , which points one past the end of the array; and curr, which points to the array element to which this CheckedPtr object currently refers The constructor takes two pointers: one pointing to the beginning of the array and the other one past the end of the array The constructor initializes beg and end from these pointers and initializescurr to point to the first element
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