of Contents | Index in Visual Studio .NET

Creator ECC200 in Visual Studio .NET of Contents | Index
Table of Contents | Index
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Argument Matching and Conversions by Constructors
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Just as there might be two conversion operators, there can also be two constructors that might be This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help applied to convert a value to the target type of a conversion
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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 the manip function, which takes an argument of type SmallInt : Consider 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 &); the features of C++, also show how to make the best use of the void manip(const SmallInt explain language As in itsd; int editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes double previous i; long l; it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten manip(d); // ok: useSmallInt(double)to convert the argument Classicmanip(i);for quicker learning, SmallInt(int) to convert the argument the most current programming Restructured // ok: use using the C++ standard library Updated to teach styles and program design techniques Filled with new learning aids that emphasize important points, warn about common manip(l); // error: ambiguous pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills 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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In the first call, we could use either of the SmallInt constructors to convert d to a value of type SmallInt The int constructor requires a standard conversion on d, whereas the double constructor is an exact match Because an exact match is better than a standard conversion, the constructorSmallInt(double) is used for the conversion In the second call, the reverse is true The SmallInt(int) constructor provides an exact matchno additional conversion is needed To call the SmallInt constructor that takes a double would require thati first be converted to double For this call, the int constructor would be used to convert the argument The third call is ambiguous Neither constructor is an exact match for long Each would require that the argument be converted before using the constructor:
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1 standard conversion (long to double) followed by SmallInt(double) 2 standard conversion (long to int ) followed by SmallInt(int) These conversion sequences are indistinguishable, so the call is ambiguous
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When two constructor-defined conversions could be used, the rank of the standard conversion, if any, required on the constructor argument is used to select the best match
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Ambiguities When Two Classes Define Conversions
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When two classes Stanley B Lippman,Jos eto each other, ambiguities are likely: define conversions Lajoie, By
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Barbara E Moo class Integral; Publisher:Addison Wesley class SmallInt { Professional public: Pub Date: February 14, 2005 SmallInt(Integral); // convert fromIntegral to SmallInt Print ISBN: 0-201-72148-1 // Pages: 912 C++ Primer, Fourth Edition
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Table of Contents | Index
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}; class Integral { public: operator SmallInt() const; // convert fromSmallInt toIntegral // This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help }; learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last programmers edition,void compute(SmallInt); so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving Integral write useful readers the means to int_val;programs without first having to master every language detail Highlighting today's best compute(int_val); // error: ambiguous 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 The argument int_val can be converted tostandard library Updated to teach the ways Theprogramming could Classic Restructured for quicker learning, using the C++ a SmallInt in two different most current compiler use the SmallInt constructor Filled with newan Integral object or it could points, warn about common styles and program design techniques that takes learning aids that emphasize important use the Integral conversion operation that converts an Integral to a SmallInt Because these with exercises that reinforce skills good, pitfalls, suggest good programming practices, and provide general usage tips Complete two functions are equally the call is in error comprehensive in its coverageThe source code for the book's extended examples is available on learned Authoritative and the Web at the address below
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In this case, we cannot use a cast to resolve the ambiguitythe cast itself could use either the conversion operation or the constructor Instead, we would need to explicitly call the conversion operator or the constructor:
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compute(int_valoperator SmallInt()); compute(SmallInt(int_val));
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