Argument Matching and Multiple Conversion Operators in .NET framework

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To illustrate how conversions on values of class type interact with function matching, we'll add two additional conversions to our SmallInt class We'll add a second constructor that takes a double and also define a second conversion operator to convert SmallInt to double:
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// unwise class definition: // multiple constructors and conversion operators to and from the built-in types // can lead to ambiguity problems class SmallInt { public:
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// conversions to SmallInt from int and double SmallInt(int = 0); SmallInt(double); C++ Primer, int or Edition // Conversions toFourth double from SmallInt By Stanley B is unwise to define conversions to multiple arithmetic types // Usually it Lippman,Jos e Lajoie, Barbara E Moo operator int() const { return val; } operator double() const { return val; } Publisher:Addison Wesley // private: Professional Pub Date: February 14, 2005 std::size_t val; Print ISBN: 0-201-72148-1 };
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Pages: 912
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Table of Contents | Index
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last Ordinarily it is a bad idea to give a class conversions to or from two edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving built-in types We do so here to illustrate the pitfalls involved 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 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 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 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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Consider the simple case where we call a function that is not overloaded:
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void compute(int); void fp_compute(double); void extended_compute(long double); SmallInt si; compute(si); // SmallInt::operator int() const fp_compute(si); // SmallInt::operator double() const extended_compute(si); // error: ambiguous
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Either conversion operator could be used in the call to compute:
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1 operator int generates an exact match to the parameter type 2 operator double followed by the standard conversion from double to int matches the parameter type An exact match is a better conversion than one that requires a standard conversion Hence, the first conversion sequence is better The conversion function SmallInt::operator int() is chosen to convert the argument Similarly, in the second call, fp_compute could be called using either conversion However, the conversion to double is an exact match; it requires no additional standard conversion The final call to extended_compute is ambiguous Either conversion function could be used, but each would have to be followed by a standard conversion to get to long double Hence, neither conversion is better than the other, so the call is ambiguous
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C++ Primer, Fourth Edition
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If By Stanley B Lippman,Jos e Lajoie, two conversion operators could be used in a call, then the rank of the standard conversion (Section 784, p 272), if any, following the Barbara E Moo conversion function is used to select the best match
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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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