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This call would be ambiguous even if one of the classes defined a constructor that required a standard conversion for the argument For example, if SmallInt defined a constructor that took a short instead of an int , the call manip(10) would require a standard conversion from int to short before using that constructor The fact that one call requires a standard conversion and the other does not is immaterial when selecting among overloaded versions of a call The compiler will not prefer the direct constructor; the call would still be ambiguous
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Explicit Constructor Call to Disambiguate
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The caller can disambiguate by explicitly constructing a value of the desired type:
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manip(SmallInt(10)); manip(Integral(10));
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// ok: call manip(SmallInt) // ok: call manip(Integral)
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Needing to use a constructor or a cast to convert an argument in a call to an overloaded function is a sign of bad design
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1495 Overloading, Conversions, and Operators
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Overloaded operators are Fourth Edition functions The same process that is used to resolve a call to C++ Primer, overloaded an overloaded function is used to Jos e Lajoie, which operator built-in or class-typeto apply to a By Stanley B Lippman, determine given expression Given code such as Barbara E Moo
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Publisher:Addison Wesley ClassX sc; Professional int iobj = sc + 3; Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 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 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 Exercise Show the possible class-type conversion sequences for each of Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the 1444: the following initializations What is the outcome of each language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes initialization 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 LongDouble { class 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 operator double(); learned Authoritative and comprehensiveoperator float();code for the book's extended examples is available on in its coverageThe source the Web at the address below };
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Exercises Section 1494
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LongDouble ldObj; (a) int ex1 = ldObj;
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(b) float ex2 = ldObj;
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Exercise 1445:
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Whichcalc() function, if any, is selected as the best viable function for the following call Show the conversion sequences needed to call each function and explain why the best viable function is selected
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class LongDouble { public LongDouble(double); // }; void calc(int); void calc(LongDouble); double dval; calc(dval); // which function
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there are four possibilities: There is an overloaded addition operator that matches ClassX and int
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There are conversions to convert sc and/or to convert an int to types for which + is defined If so, this expression will use the conversion(s) followed by applying the appropriate addition operator C++ Primer, Fourth Edition
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By Stanley B Lippman,Jos e Lajoie, Barbara ambiguous because both a conversion operator and an overloaded version The expression isE Moo of+ are defined Publisher:Addison Wesley Professional The expression is invalid because there is neither a conversion nor an over-loaded + to use Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912