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Supporting Pointer Operations
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Among the fundamental operations a pointer supports are dereference and arrow We can give our class these operations as follows:
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class ScreenPtr { public: // constructor and copy control members as before Screen &operator*() { return *ptr->sp; } Screen *operator->() { return ptr->sp; } const Screen &operator*() const { return *ptr->sp; } const Screen *operator->() const { return ptr->sp; } private: ScrPtr *ptr; // points to use-counted ScrPtr class };
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The dereference operator is a unary operator In this class, it is defined as a member so it has no explicit parameters The operator returns a reference to the Screen to which this ScreenPtr points As with the subscript operator, we need both const and nonconst versions of the dereference operator These differ in their return types: The const member returns a reference to const to prevent users from changing the underlying object
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OverloadingC++ Primer, Fourth Edition the Arrow Operator
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By Stanley B Lippman,Jos e Lajoie,
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Operator arrow is unusual It may appear to be a binary operator that takes an object and a Barbara E Moo member name, dereferencing the object in order to fetch the member Despite appearances, the arrow operator takesAddison Wesley Publisher: no explicit parameter There is no second parameter because the right-hand operand of -> is not an expression Pub Date: February 14, 2005 Rather, the right-hand operand is an identifier that corresponds to a member of a class There Print ISBN: 0-201-72148-1 is no obvious, useful way to pass an identifier as a parameter to a function Instead, the Pages: 912 compiler handles the work of fetching the member When we write
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help point->action(); 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 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 precedence take advantage it the library, andto writing Examples that rules make of equivalent 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 (point->action)(); 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 In other words, we want to call the result of evaluating point->action The compiler evaluates the Web at the address below Professional
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Table of Contents | Index
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this code as follows:
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1 Ifpoint is a pointer to a class object that has a member named action, then the compiler writes code to call the action member of that object 2 Otherwise, if point is an object of a class that defines operator->, then point->action is the same as pointoperator->()->action That is, we execute operator->() on point and then repeat these three steps, using the result of executing operator-> on point 3 Otherwise, the code is in error
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We can use a ScreenPtr object to access members of a Screen as follows:
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ScreenPtr p(&myScreen); p->display(cout);
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