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Table of Contents | Index
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class NoName { public: // constructor(s) go here private: has been completely updated, reorganized, and rewritten to help This popular tutorial introduction to standard C++ std::string *pstring; programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last int ival; edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving double dval; 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
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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 Explain how you decided how many constructors were Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming styles and program design needed and what parameters they should important points, warn about common techniques Filled with new learning aids that emphasize take pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills Exercise Choose one its coverageThe source code for the (or extended examples learned Authoritative and comprehensive inof the following abstractionsbook'san abstraction is available on 1220: of the Web at the address belowyour own choosing) Determine what data is needed in
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the class Provide an appropriate set of constructors Explain your decisions
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(a) Book (d) Vehicle
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(b) Date (e) Object
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(c) Employee (f) Tree
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1241 The Constructor Initializer
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Like any other function, a constructor has a name, a parameter list, and a function body Unlike other functions, a constructor may also contain a constructor initializer list:
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// recommended way to write constructors using a constructor initializer Sales_item::Sales_item(const string &book): isbn(book), units_sold(0), revenue(00) { }
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The constructor initializer starts with a colon, which is followed by a comma-separated list of data members each of which is followed by an initializer inside parentheses This constructor initializes the isbn member to the value of its book parameter and initializes units_sold and revenue to 0 As with any member function, constructors can be defined inside or outside of the class The constructor initializer is specified only on the constructor definition, not its declaration
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C++ Primer, Fourth Edition
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TheStanley B Lippman,Jos e Lajoie,a feature that many reasonably By constructor initializer is experienced C++ programmers have not mastered Barbara E Moo
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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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One reason constructor initializers are hard to understand is that it is usually legal to omit the This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help initializer list and assign values to the data members inside the constructor body For programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last example, we could write the Sales_item constructor that takes a string as
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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 // legal but sloppier way to write the constructor: Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the // no constructor initializer language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes Sales_item::Sales_item(const string &book) it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten { Classic Restructured for book;learning, using the C++ standard library Updated to teach the most current programming isbn = quicker styles and program design techniques Filled with new learning aids that emphasize important points, warn about common units_sold = 0; pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills revenue = 00; 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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This constructor assigns, but does not explicitly initialize, the members of class Sales_item Regardless of the lack of an explicit initializer, the isbn member is initialized before the constructor is executed This constructor implicitly uses the default string constructor to initializeisbn When the body of the constructor is executed, the isbn member already has a value That value is overwritten by the assignment inside the constructor body Conceptually, we can think of a constructor as executing in two phases: (1) the initialization phase and (2) a general computation phase The computation phase consists of all the statements within the body of the constructor
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Data members of class type are always initialized in the initialization phase, regardless of whether the member is initialized explicitly in the constructor initializer list Initialization happensbefore the computation phase begins
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Each member that is not explicitly mentioned in the constructor initializer is initialized using the same rules as those used to initialize variables (Section 234, p 50) Data members of class type are initialized by running the type's default constructor The initial value of members of built-in or compound type depend on the scope of the object: At local scope those members are uninitialized, at global scope they are initialized to 0 The two versions of the Sales_item constructor that we wrote in this section have the same
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effect: Whether we initialized the members in the constructor initializer list or assigned to them inside the constructor body, the end result is the same After the constructor completes, the three data members hold the same values The difference is that the version that uses the C++ Primer, Fourth Edition constructor initializer initializes its data members The version that does not define a By Stanley B Lippman,Jos e Lajoie, constructor initializer assigns values to the data members in the body of the constructor How Barbara E Moo significant this distinction is depends on the type of the data member
Publisher:Addison Wesley Professional Constructor Initializers Are Sometimes Required Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 If an initializer is not provided for a class member, then the compiler implicitly uses the Pages: 912