Using an auto_ptr in .NET

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Using an auto_ptr
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Table of Contents | Index
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Suppose we wish to access a string operation With an ordinary string pointer, we'd do the following:
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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 string *pstr_type = to teaching it They now introduce the C++ edition, so has the authors' approach new string("Brontosaurus");standard library from the beginning, giving if (pstr_type->empty()) readers the means to write useful programs without first having to master every language detail Highlighting today's best // oops, something wrong 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 it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten Theauto_ptr class defines overloaded versions of the dereference (*the most current (->) operators Classic Restructured for quicker learning, using the C++ standard library Updated to teach ) and arrow programming (Section programp 523) Because auto_ptr defines these operators, we points,use an auto_ptr in styles and 146, design techniques Filled with new learning aids that emphasize important can warn about common some ways that are similar practices, and provide general usage tips Complete with exercises that reinforce skills pitfalls, suggest good programming to using a built-in pointer: 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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// normal pointer operations for dereference and arrow *ap1 = "TRex"; // assigns a new value to the object to which ap1 points string s = *ap1; // initializes s as a copy of the object to which ap1 points if (ap1->empty()) // runsempty on thestring to which ap1 points
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The primary purpose of auto_ptr is to support ordinary pointerlike behavior while ensuring that the object to which an auto_ptr object refers is automatically deleted As we'll see, the fact that objects are automatically deleted leads to significant differences between auto_ptrs and ordinary pointers with respect to how we copy and access their address value
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Copy and Assignment on auto_ptr Are Destructive Operations
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There is a crucially important difference between how auto_ptr and built-in pointers treat copy and assignment When we copy an auto_ptr or assign its value to another auto_ptr , ownership of the underlying object is transferred from the original to the copy The original auto_ptr is reset to an unbound state
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Copying (or assigning) ordinary pointers copies (assigns) the address After the copy (assignment), both pointers point to the same object After copying (or assigning) auto_ptrs,
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the original points to no object and the new auto_ptr (left-hand auto_ptr) owns the underlying object:
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auto_ptr<string> ap1(new string("Stegosaurus")); By Stanley B Lippman,Jos e Lajoie, // after the Barbara Eis unbound copy ap1 Moo auto_ptr<string> ap2(ap1); // ownership transferred from ap1 toap2
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Publisher:Addison Wesley Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 When we copy or assign an auto_ptr , the right-hand auto_ptr relinquishes all responsibility for Pages: 912 the underlying object and is reset to be an unbound auto_ptr In our example, it is ap2 that
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Table of Contents | Index deletes the string
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object, and not ap1 After the copy, ap1 no longer refers to any object
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Unlike other copy or assignment operations, auto_ptr copy and assignment change the righthand operand As a result, both the left- and right-hand operands to assignment must be This popular lvalues modifiable tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help
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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 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 Assignment Deletes the Object Pointed Tobuilt quickly, and yet offer outstanding performance by the Left Operand practices, they show how to write programs that are safe, can be Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the In addition in itstransferring ownershipauthoritative discussion of fundamental C++ concepts and techniques makes language As to previous editions, the book's from the right-hand to the left-hand operand, assignment also deletes the object to which the left-hand operand originallyMore Effectively with This Rewritten two it a valuable resource even for more experienced programmersProgram Faster and referredprovided that the objects are different As usual, self-assignment has no Updated to teach the most current programming Classic Restructured for quicker learning, using the C++ standard library effect 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 auto_ptr<string> ap3(new string("Pterodactyl")); learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on // object pointed to the Web at the address belowbyap3 is deleted and ownership transferred from ap2 toap3;
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ap3 = ap2;
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