Explicit Conversions in .NET framework

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5124 Explicit Conversions
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Although necessary at times, casts are inherently dangerous constructs
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5125 When Casts Might Be Useful
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One reason to perform an explicit cast is to override the usual standard conversions The following compound assignment
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double dval; int ival; ival *= dval; // ival = ival * dval
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convertsival to double in order to multiply it by dval That double result is then truncated to int in order to assign it to ival We can eliminate the unnecessary conversion of ival to double by
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explicitly casting dval to int :
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C++ Primer, Fourth Edition ival *= static_cast<int>(dval); // convertsdvaltoint By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Another reason for an explicit cast is to select a specific conversion when more than one Professional conversion is possible We will look at this case more closely in 14 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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5126 Named Casts
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The general form for the named cast notation is the following:
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help cast-name<type>(expression); 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 Examples that take be one of the library, and explain the features dynamic_cast how reinterpret_castthe cast-name may advantageof static_cast, const_cast, of C++, also show , or to make the best use of type is language As in its of the conversion, and expression is the fundamental C++ concepts type of cast the target typeprevious editions, the book's authoritative discussion of value to be cast Theand techniques makes it a valuable resource even for kind of conversion that is performed on the expression determines the specific 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 dynamic_cast 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 Adynamic_cast supports the run-time identification of objects addressed either by a pointer or
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reference We cover dynamic_cast in Section 182 (p 772)
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const_cast
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Aconst_cast, as its name implies, casts away the constness of its expression For example, we might have a function named string_copy that we are certain reads, but does not write, its single parameter of type char* If we have access to the code, the best alternative would be to correct it to take a const char* If that is not possible, we could call string_copy on a const value using aconst_cast:
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const char *pc_str; char *pc = string_copy(const_cast<char*>(pc_str));
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Only a const_cast can be used to cast away constness Using any of the other three forms of cast in this case would result in a compile-time error Similarly, it is a compile-time error to use theconst_cast notation to perform any type conversion other than adding or removing const
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static_cast
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Any type conversion that the compiler performs implicitly can be explicitly requested by using a
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static_cast:
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double d = 970; // cast specified to indicate that the conversion is intentional char ch = static_cast<char>(d);
Such casts are useful when assigning a larger arithmetic type to a smaller type The cast informs C++ Primer, Fourth Edition both the reader By Stanley B Lippman,Jos e Lajoie, of the program and the compiler that we are aware of and are not concerned about the potential loss of precision Compilers often generate a warning for assignments of a Barbara E Moo larger arithmetic type to a smaller type When we provide the explicit cast, the warning message is turned off Publisher:Addison Wesley Astatic_cast is also useful to perform a conversion that the compiler will not generate Pub Date: February 14, 2005 automatically For example, we can use a static_cast to retrieve a pointer value that was stored Print ISBN: 0-201-72148-1 in a void* pointer (Section 422, p 119):
Pages: 912