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Using Multiple Initializers
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When we initialize an object of a built-in type, there is only one way to do so: We supply a value, and that value is copied into the newly defined object For built-in types, there is little difference between the direct and the copy forms of initialization For objects of a class type, there are initializations that can be done only using directinitialization To understand why, we need to know a bit about how classes control initialization Each class may define one or more special member functions (Section 152, p 24) that say how we can initialize variables of the class type The member functions that define how initialization works are known as constructors Like any function, a constructor can take multiple arguments A class may define several constructors, each of which must take a different number or type of arguments As an example, we'll look a bit at the string class, which we'll cover in more detail in
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3 The string type is defined by the library and holds character strings of varying sizes To use strings, we must include the string header Like the IO types, string is defined in the std namespace
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C++ Primer, Fourth Edition
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Thestring class By Stanley several constructors, giving us various ways to initialize a string One defines B Lippman,Jos e Lajoie, Barbara string way we can initialize a E Moo is as a copy of a character string literal:
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Publisher:Addison Wesley #include <string> Professional // alternative ways to initialize string from a character string literal Pub Date: February 14, 2005 std::string ISBN: 0-201-72148-1 Print titleA = "C++ Primer, 4th Ed"; std::string titleB("C++ Primer, 4th Ed"); Pages: 912
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Table of Contents | Index
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In this case, either initialization form can be used Both definitions create a string object This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help whose initial value is a copy of the specified string literal
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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 a string from a count the C++ standard library from so creates a However, we can also initializeteaching it They now introduceand a character Doingthe beginning, giving readers containing the specified character repeated as many times as indicated by the count: string 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 all_nines(10,authoritative discussion of fundamental C++ concepts and techniques makes std::string editions, the book's '9'); // all_nines= "9999999999" 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, case, the programming practices, and provide general by using the direct form of initialization In thissuggest good only way to initialize all_nines is usage tips Complete with exercises that reinforce skills It is learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on not possible to use copy-initialization with multiple initializers the Web at the address below
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Initializing Multiple Variables
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When a definition defines two or more variables, each variable may have its own initializer The name of an object becomes visible immediately, and so it is possible to initialize a subsequent variable to the value of one defined earlier in the same definition Initialized and uninitialized variables may be defined in the same definition Both forms of initialization syntax may be intermixed:
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#include <string> // ok: salary defined and initialized before it is used to initialize wage double salary = 999999, wage(salary + 001); // ok: mix of initialized and uninitialized int interval, month = 8, day = 7, year = 1955; // ok: both forms of initialization syntax used std::string title("C++ Primer, 4th Ed"), publisher = "A-W";
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An object can be initialized with an arbitrarily complex expression, including the return value of a function:
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double price = 10999, discount = 016; double sale_price = apply_discount(price, discount);
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In this example, apply_discount is a function that takes two values of type double and returns a value of type double We pass the variables price and discount to that function and use its return value to initialize sale_price C++ Primer, Fourth Edition
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By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley When we define Professional a variable without an initializer, the system sometimes initializes the variable Pub Date: February 14, for us What value, if any, is supplied 2005 depends on the type of the variable and may depend on Print where it is defined ISBN: 0-201-72148-1 Pages: 912
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