of // pf points to Contents | Index in Visual Studio .NET

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Table of // pf points to Contents | Index
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function returning boolthat takes twoconst string references bool (*pf)(const string &, const string &);
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help programmers learn declares pf to and use it in a more a function that takes two has evolved since This statement the language faster be a pointer to modern, effective wayJust as C++const string& the last edition, so has and has approach type of it They parameters the authors'a returnto teaching bool 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 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 forparentheses around *pf standard library Updated to teach the most current programming The quicker learning, using the C++ are necessary: 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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// declares a function namedpf that returns a bool* bool *pf(const string &, const string &);
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Using Typedefs to Simplify Function Pointer Definitions
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Function pointer types can quickly become unwieldy We can make function pointers easier to use by defining a synonym for the pointer type using a typedef (Section 26, p 61):
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typedef bool (*cmpFcn)(const string &, const string &);
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This definition says that cmpFcn is the name of a type that is a pointer to function That pointer has the type "pointer to a function that returns a bool and takes two references to const string" When we need to use this function pointer type, we can do so by using cmpFcn, rather than having to write the full type definition each time
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When we use a function name without calling it, the name is automatically treated as a pointer to a function Given
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// compares lengths of twostrings bool lengthCompare(const string &, const string &);
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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, Barbara E Moo any use of lengthCompare , except as the left-hand operand of a function call, is treated as a pointer whose type is Publisher:Addison Wesley Professional Pub Date: February 14, 2005 bool (*)(const string &, const string &); Print ISBN: 0-201-72148-1 Pages: 912
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Table of Contents | Index
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We can use a function name to initialize or assign to a function pointer:
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help cmpFcn pf1 = 0; // ok: unbound pointer to function programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last cmpFcn pf2 = lengthCompare; // ok: pointer type matches function's type edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving pf1 = lengthCompare; // ok: pointer type matches function's type readers the means to write useful programs without first having to master every language detail Highlighting today's best pf2 = pf1; // ok: pointer types match 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 Using the function name learning, using the C++ standard libraryaddress-of operator to the programming is equivalent to applying the Updated to teach the most current function Classic Restructured for quicker name: program design techniques Filled with new learning aids that emphasize important points, warn about common styles and 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 cmpFcn pf1 = lengthCompare; the Web at the address below
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cmpFcn pf2 = &lengthCompare;
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A function pointer may be initialized or assigned only by a function or function pointer that has the same type or by a zero-valued constant expression
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Initializing a function pointer to zero indicates that the pointer does not point to any function There is no conversion between one pointer to function type and another:
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string::size_type sumLength(const string&, const string&); bool cstringCompare(char*, char*); // pointer to function returning booltaking two const string& cmpFcn pf; pf = sumLength; // error: return type differs pf = cstringCompare; // error: parameter types differ pf = lengthCompare; // ok: function and pointer types match exactly
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