Class Definitions: A Recap in VS .NET

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In writing this class in Section 28 (p 63) and Section 77 (p 258), we already learned a fair bit about classes
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Most fundamentally, a class defines a new type and a new scope
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Class Members
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Each class defines zero or more members Members can be either data, functions, or type definitions
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A class may contain multiple public, private, and protected sections We've already used thepublic and private access labels: Members defined in the public section are accessible to all code that uses the type; those defined in the private section are accessible to other class C++ Primer, Fourth Edition members We'll have more to say about protected when we discuss inheritance in By Stanley B Lippman,Jos e Lajoie, 15
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Barbara E Moo All members must be declared inside the class; there is no way to add members once the Publisher:Addison Wesley class definition is complete Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912
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Constructors
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Table of Contents | Index
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When we create an object of a class type, the compiler automatically uses a constructor (Section 233, p 49) to initialize the object A constructor is a special member function that has the same name as the class Its purpose is to ensure that each data member is set to sensible initial values This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help A constructor generally should teaching constructor initializer list (Section 773, p 263), to edition, so has the authors' approach to use a it They now introduce the C++ standard library from the beginning, giving initialize the datawrite useful programs without first having to master every language detail Highlighting today's best readers the means to members of the object:
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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 //default constructor needed to initialize members of built-in type language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes Sales_item(): units_sold(0), revenue(00) { } 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 The constructor initializer list is in its coverageThe source code for the parenthesized initial is availableIt learned Authoritative and comprehensive a list of member names and book's extended examples values on follows at theconstructor's parameter list and begins with a colon the Web the address below programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last
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Member Functions
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Member functions must be declared, and optionally may be defined, inside the class; functions defined inside the class are inline (Section 76, p 256) by default Member functions defined outside the class must indicate that they are in the scope of the class The definition of Sales_item::avg_price uses the scope operator (Section 122, p 8) to indicate that the definition is for the avg_price function of the Sales_item class Member functions take an extra implicit argument that binds the function to the object on behalf of which the function is calledwhen we write
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transavg_price()
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we are calling the avg_price function on the object named trans If TRans is a Sales_item object, then references to a member of the Sales_item class inside the avg_price function are to the members in trans Member functions may be declared const by putting the const keyword following the parameter list:
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double avg_price() const;
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