Calling a Function through a Pointer in Visual Studio .NET

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Calling a Function through a Pointer
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A pointer to a function can be used to call the function to which it refers We can use the pointer directlythere is no need to use the dereference operator to call the function
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cmpFcn pf = lengthCompare; Barbara E Moo lengthCompare("hi", "bye"); // direct call pf("hi", Publisher:Addison Wesley// equivalent call:pf1 implicitly dereferenced "bye"); (*pf)("hi", "bye"); // equivalent call:pf1 explicitly dereferenced Professional
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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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If the pointer to function is uninitialized or has a value of zero, it
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This popular tutorial introduction to used inC++ has been completely updated, have beenand rewritten to help may not be standard a call Only pointers that reorganized, initialized programmers learnor assigned to refer to a function can effective wayJust as to call a the language faster and use it in a more modern, be safely used 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 function 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 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 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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A function parameter can be a pointer to function We can write such a parameter in one of two ways: [View full width] /* useBigger function's third parameter is a pointer to function * that function returns abooland takes two const string references * two ways to specify that parameter: */ // third parameter is a function type and is automatically treated as a pointer to function void useBigger(const string &, const string &, bool(const string &, const string &)); // equivalent declaration: explicitly define the parameter as a pointer to function void useBigger(const string &, const string &, bool (*)(const string &, const string &));
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Returning a Pointer to Function
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A function can return a pointer to function, although correctly writing the return type can be a challenge:
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// ff is a function taking an int and returning a function pointer // the function pointed to returns an int and takes anint*and anint int (*ff(int))(int*, int);
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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 We can figure out what this declaration means by observing that
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Table of Contents | Index
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The best way to read function pointer declarations is from the inside out, starting with the name being declared
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ff(int)
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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 ff is a function taking one it They now introduce the C++ standard library returns says thathas the authors' approach to teachingparameter of type int This functionfrom 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 int (*)(int*, int); 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 for quicker learning, using the C++ standard library Updated to teach the most current programming styles and to a function that returns an int and aids that emphasize important points, warn about common a pointerprogram design techniques Filled with new learningtakes two parameters of type int* and an int pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills learned Authoritative and such declarations considerably code for the book's Typedefs can make comprehensive in its coverageThe source easier to read: extended examples is available on the Web at the address below
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// PF is a pointer to a function returning an int, taking an int*and anint typedef int (*PF)(int*, int); PF ff(int); // ff returns a pointer to function
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We can define a parameter as a function type A function return type must be a pointer to function; it cannot be a function
An argument to a parameter that has a function type is automatically converted to the corresponding pointer to function type The same conversion does not happen when returning a function:
// funcis a function type, not a pointer to function! typedef int func(int*, int); void f1(func); // ok: f1 has a parameter of function type func f2(int); // error: f2 has a return type of function type func *f3(int); // ok: f3 returns a pointer to function type