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Moreover, conversions that we might think would be ambiguous can be legal for what seem like trivial reasons For example, our SmallInt class constructor copies its Integral argument If we change the constructor so that it takes a reference to const Integral
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class SmallInt { public: SmallInt(const Integral&); };
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our call to compute(int_val) is no longer ambiguous! The reason is that using the SmallInt constructor requires binding a reference to int_val, whereas using class Integral 's conversion operator avoids this extra step This small difference is enough to tip the balance in favor of using the conversion operator
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The best way to avoid ambiguities or surprises is to avoid writing pairs of classes where each offers an implicit C++ Primer, Fourth Edition the other conversion to
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By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Professional 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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Caution: Avoid Overuse of Conversion Functions
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help As with using overloaded and use it in a judicious use of conversion operators programmers learn the language faster operators,more modern, effective wayJust as C++ has evolved since the last can greatly authors' approach to teaching it They designer the C++ standard library from the easier edition, so has thesimplify the job of a class now introduceand make using a classbeginning, giving However, there are two potential first having to master every language detail Highlighting readers the means to write useful programs withoutpitfalls: Defining too many conversion today's best operators can lead to programs that are safe, can be some conversions can be practices, they show how to writeambiguous code, andbuilt quickly, and yet offer outstanding performance confusing rather than helpful 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 The best way even for more experienced programmersProgram Faster and More at most one way it a valuable resourceto avoid ambiguities is to ensure that there is Effectively with This Rewritten to convert one type to another The best way to do that is to limit current programming Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most the number of conversion operators Filled with new learning aids that emphasize important points, warn about to styles and program design techniquesIn particular there should be only one conversion common a built-in type 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 Conversion operators the Web at the address below can be misleading when they are used where there is
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no obvious single mapping between the class type and the conversion type In such cases, providing a conversion function may be confusing to the user of the class
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As an example, if we had a class that represented a Date, we might think it would be a good idea to provide a conversion from Date to int However, what value should the conversion function return The function might return the julian date, which is the sequence number of the current date starting from 0 as January 1 But should the year precede the day or follow it That is, would January 31, 1986 be represented as 1986031 or 311986 Alternatively, the conversion operator might return an int representing the day count since some epoch point The counter might count days since January 1, 1971 or some other starting point The problem is that whatever choice is made, the use of Date objects will be ambiguous because there is no single one-to-one mapping between an object of type Date and a value of type int In such cases, it is better not to define the conversion operator Instead, the class ought to define one or more ordinary members to extract the information in these various forms
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