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Defining a
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Table of Contents | If a derived Index
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class explicitly defines its own copy constructor or assignment operator, that definition completely overrides the defaults The copy constructor and assignment operator for inherited classes are responsible for copying or assigning their This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help base-class faster and use it as more as the members in the class evolved programmers learn the language components in a well modern, effective wayJust as C++ hasitself since the last
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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 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 derived class defines its own copy constructor, that copy constructor usually should If a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten Classic Restructured base-class copy constructor to initialize the to teach the of the object: explicitly use thefor quicker learning, using the C++ standard library Updated base part 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 class Base { /* */ its learned Authoritative and comprehensive in };coverageThe source code for the book's extended examples is available on class Derived: the Web at the address below public Base {
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public: // Base::Base(const Base&) not invoked automatically Derived(const Derived& d): Base(d) /* other member initialization */ { /* */ } };
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The initializer Base(d) converts (Section 153, p 577) the derived object, d, to a reference to its base part and invokes the base-class copy constructor Had the initializer for the base class been omitted,
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// probably incorrect definition of the Derived copy constructor Derived(const Derived& d) /* derived member initizations */ {/* */ }
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the effect would be to run the Base default constructor to initialize the base part of the object Assuming that the initialization of the Derived members copied the corresponding elements fromd, then the newly constructed object would be oddly configured: Its Base part would hold default values, while its Derived members would be copies of another object
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Derived-Class Assignment Operator
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As usual, the assignment operator is similar to the copy constructor: If the derived class defines its own assignment operator, then that operator must assign the base part explicitly:
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// Base::operator=(const Base&) not invoked automatically Derived &Derived::operator=(const Derived &rhs) { C++ != &rhs) { if (this Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, Base::operator=(rhs); // assigns the base part Barbara E Moo // do whatever needed to clean up the old value in the derived part // assign the members from the derived Publisher:Addison Wesley } Professional return *this; Pub Date: February 14, 2005 }
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Print ISBN: 0-201-72148-1 Pages: 912
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Table of Contents | Index
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The assignment operator must, as always, guard against self-assignment Assuming the leftand right-hand operands differ, then we call the Base class assignment operator to assign the base-class portion That operator might be defined by the class or it might be the synthesized This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help assignment operator It doesn't matterwe can call it directly The base-class operator will free programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last the old value in the base part of the left-hand operand and will assign the new values from edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving rhs Once that operator finishes, we continue doing whatever is needed to assign the readers the means to write useful programs without first having to master every language detail Highlighting today's best members in the derived class
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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 Derived-Class Destructor 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 differently from the copy aids that emphasize assignment operator: The The destructor workstechniques Filled with new learning constructor andimportant points, warn about common pitfalls, suggest good programming responsible for destroying the Complete with exercises that reinforce The derived destructor is never practices, and provide general usage tips members of its base objects skills learned Authoritative implicitly invokes the destructor for the base part of a derived object Each compiler always and comprehensive in its coverageThe source code for the book's extended examples is available on the Web at the address below destructor does only what is necessary to clean up its own members:
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class Derived: public Base { public: // Base::~Base invoked automatically ~Derived() { /* do what it takes to clean up derived members */ } };
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Objects are destroyed in the opposite order from which they are constructed: The derived destructor is run first, and then the base-class destructors are invoked, walking back up the inheritance hierarchy
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