Defining and Initializing Enumerations in .NET

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Defining and Initializing Enumerations
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// input is 0, output is 1, and append is 2 enum open_modes {input, output, append};
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By default, the first enumerator is assigned the value zero Each subsequent enumerator is assigned a value one greater than the value of the enumerator that immediately precedes it
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Enumerators Are const Values
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We may supply an initial value for one or more enumerators The value used to initialize an enumerator must be a constant expression A constant expression is an expression of integral type that the compiler can evaluate at compile time An integral literal constant is a constant expression, as is a const object (Section 24, p 56) that is itself initialized from a constant expression For example, we might define the following enumeration:
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// shape is 1, sphere is 2, cylinder is 3, polygon is 4 enum Forms {shape = 1, sphere, cylinder, polygon};
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In the enum Forms we explicitly assigned shape the value 1 The other enumerators are implicitly initialized: sphere is initialized to 2, cylinder to 3, and polygon to 4 An enumerator value need not be unique
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// point2d is 2, point2w is 3, point3d is 3, point3w is 4 enum Points { point2d = 2, point2w, C++ Primer, Fourth Edition point3w }; point3d = 3,
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By Stanley B Lippman,Jos e Lajoie, Barbara E Moo In this example,Publisher:Addison Wesley is explicitly initialized to 2 The next enumerator, the enumerator point2d Professional point2w, is initialized by default, meaning that its value is one more than the value of the Pub Date: February 14, 2005 previous enumerator Thus, point2w is initialized to 3 The enumeratorpoint3d is explicitly Print ISBN: 0-201-72148-1 initialized to 3, and point3w, again is initialized by default, in this case to 4 Pages: 912
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Table of Contents | Index It is not possible to
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change the value of an enumerator As a consequence an enumerator is itself a constant expression and so can be used where a constant expression is required
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help
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Eachenum Defines a Unique in a more modern, effective wayJust as C++ has evolved since the last programmers learn the language faster and use it Type
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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 defines a new type As without first having we can define and detail Highlighting today's best Eachenum means to write useful programswith any type, to master every language initialize objects of type practices, they show how those objects in are safe, ways An object of enumeration type may be Points and can use to write programs that variouscan be built quickly, and yet offer outstanding performance Examples that assigned only by one of explain the features of C++, also show how to make the best use of initialized ortake advantage of the library, and its enumerators or by another object of the same the language As in type: enumeration 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 Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming styles and program design= point3d; // new point3d is that emphasize important points, warn about common Points pt3d techniques Filled with ok: learning aids aPoints enumerator pitfalls,Pointsgood programming practices, and error: pt2winitializedtips Complete with exercises that reinforce skills suggest pt2w = 3; // provide general usage with int learned Authoritative and comprehensive in //coverageThe source is notforPoints enumeratorexamples is available on its pt2w = polygon; error: polygon code a the book's extended the Web at the = pt3d; pt2w address below // ok: both are objects ofPoints enum type
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Note that it is illegal to assign the value 3 to a Points object even though 3 is a value associated with one of the Points enumerators
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C++ Primer, Fourth Edition Stanley B Lippman, 28 ClassByTypes Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley In C++ we define our own data types by defining a class A class defines the data that an object of its type containsProfessional and the operations that can be executed by objects of that type The library types string, istreamPub Date: February 14, defined as classes , and ostream are all 2005 Print ISBN: 0-201-72148-1
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C++ support forPages: 912 extensivein fact, defining classes is so important that we shall devote classes is Parts III through V to describing C++ support for classes and operations using class types Table of Contents | Index In 1 we used the Sales_item type to solve our bookstore problem We used objects of type Sales_item to keep track of sales data associated with a particular ISBN In this section, we'll take a This look at how a simple class, such has been completely updated, reorganized, first popular tutorial introduction to standard C++ as Sales_item, might be defined 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 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 Each class defines an editions, the book's authoritative discussion ofThe interface consists of techniques makes that language As in its previous interface and implementation fundamental C++ concepts and the operations we valuable resource evenuses the class to programmersProgram Faster and More Effectively with This Rewrittendata it a expect code that for more experienced execute The implementation typically includes the needed by the class The learning, using the C++ standard library Updated to teach the most currentdefine the class but Classic Restructured for quicker implementation also includes any functions needed to programming that are not intendedtechniques Filledusenew learning aids that emphasize important points, warn about common styles and program design for general with pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills When we define and comprehensive in its coverageThedefining its interfacethe operations that the class will a class, we usually begin by source code for the book's extended examples is available on learned Authoritative provide From those operations we can then determine what data the class will require to the Web at the address below
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