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Exercises Section 1621
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Exercise 1619: Exercise 1620: Exercise 1621: Exercise 1622:
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What is instantiation
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What happens during template argument deduction
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Name two type conversions allowed on function arguments involved in template argument deduction Given the following templates
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template <class Type> Type calc (const Type* array, int size); template <class Type> Type fcn(Type p1,Type p2;
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which ones of the following calls, if any, are errors Why
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double dobj; float fobj; char cobj; int ai[5] = { 511, 16, 8, 63, 34 }; (a) calc(cobj, 'c'); (b) calc(dobj, fobj); (c) fcn(ai, cobj);
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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Professional In some situations, it is not possible to deduce the types of the template arguments This Pub Date: February 14, 2005 problem arises most ISBN: 0-201-72148-1 return type must be a type that differs from any often when a function Print used in the parameter912 In such situations, it is necessary to override the template list Pages:
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1622 Function-Template Explicit Arguments
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Table of Contents | Index
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argument deduction mechanism and explicitly specify the types or values to be used for the template parameters
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This popular tutorial Explicit Template has been completely updated, reorganized, and rewritten to help Specifying an introduction to standard C++Argument programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last edition, so Consider has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving the following problem We wish to define a function template called sum that takes readers the means to write useful arguments of two differnt programsWe'd like having to master every language detail Highlightingcontain the types without first the return type to be large enough to today's best practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance sum of two values of any two types passed in any order How can we do that How should we Examples that specifysum 'stake advantage of the library, and explain the features of C++, also show how to make the best use of the return type 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// T orU as the returntype 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 template <class T, class U> sum(T, U); 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 this case, the answer is that neither parameter works all the time Using either parameter is bound to fail at some point:
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// neitherTnorUworks as return type sum(3, 4L); // second type is larger; want Usum(T, U) sum(3L, 4); // first type is larger; want Tsum(T, U)
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One approach to solving this problem would be to force callers of sum to cast (Section 5124, p183) the smaller type to the type we wish to use as the result:
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// ok: now either TorUworks as return type int i; short s; sum(static_cast<int>(s), i); // ok: instantiates int sum(int, int)
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Using a Type Parameter for the Return Type
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An alternative way to specify the return type is to introduce a third template parameter that must be explicitly specified by our caller:
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// T1 cannot be deduced: it doesn't appear in the function parameter list template <class T1, class T2, class T3> T1 sum(T2, T3);
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This version adds a template parameter to specify the return type There is only one catch: C++ Primer, Fourth Edition There is no argument whose type can be used to infer the type of T1 Instead, the caller must By Stanley B Lippman,Jos e parameter on each call to sum explicitly provide an argument for this Lajoie,
Barbara E Moo We supply an explicit template argument to a call in much the same way that we define an Publisher:Addison Wesley instance of a class template Explicit template arguments are specified in a comma-separated Professional list, bracketed by the less-than (<) and greater-than (>) tokens The list of explicit template Pub the function name and types appears after Date: February 14, 2005 before the argument list: Print ISBN: 0-201-72148-1 Pages: 912