Pointers to extern "C" Functions in .NET

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Pointers to extern "C" Functions
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The language in By Stanley B Lippman,Jos e Lajoie, is part of its type To declare a pointer to a which a function is written function written Barbara E Moo in another programming language, we must use a linkage directive:
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Publisher:Addison Wesley Professional // pf points to a C function returning voidtaking an int Pub Date: February 14, extern "C" void (*pf)(int);2005 Print ISBN: 0-201-72148-1 Pages: 912
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Table of Contents | Index
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Whenpf is used to call a function, the function call is compiled assuming that the call is to a C function
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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 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 pointer toprograms that are doescan behave the same type outstanding performance A how to write a C function safe, not built quickly, and yet offer as a pointer Examples that take advantage of the library,A pointer the features of C++, also show be initialized best use of the to a C++ function and explain to a C function cannot how to make the language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes or be assigned to point to a C++ function (and vice versa) 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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When there is such a mismatch, a compile-time error message is issued:
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void (*pf1)(int); // points to a C++ function extern "C" void (*pf2)(int); // points to a C function pf1 = pf2; // error: pf1 and pf2 have different types
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Some C++ compilers may accept the preceding assignment as a language extension, even though, strictly speaking, it is illegal
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Linkage Directives Apply to the Entire Declaration
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When we use a linkage directive, it applies to the function and any function point-ers used as the return type or as a parameter type:
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// f1 is a C function; its parameter is a pointer to a C function extern "C" void f1(void(*)(int));
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This declaration C++ Primer, Fourtha C function that doesn't return a value It has one parameter, says that f1 is Edition which is a pointer Stanley B Lippman,Jos e Lajoie, nothing and takes a single int parameter The By to a function that returns linkage directiveBarbara E Moo applies to the function pointer as well as to f1 When we call f1, we must pass it the name of a C function or a pointer to a C function Because a linkage directive applies to all the functions in a declaration, we must use a typedef Professional to pass a pointer to Date: February 14, C++ function: Pub a C function to a 2005 // FC is a pointer to C function extern "C" typedef void FC(int); // f2 is a C++ function with a parameter that is a pointer to a C function void f2(FC *);
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Print ISBN: 0-201-72148-1 Pages: 912 Publisher:Addison Wesley
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Table of Contents | Index
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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 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 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 Exercise Explain these declarations and indicate whether they are learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on 1834: legal: the Web at the address below
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