Linkage Directives and Header Files in .NET

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Linkage Directives and Header Files
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The multiple-declaration form can be applied to an entire header file For example, the C++ cstring header might look like
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// compound statement linkage directive extern "C" { #include <stringh> // C functions that manipulate C-style strings }
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When a #include directive is enclosed in the braces of a compound linkage directive, all ordinary function declarations in the header file are assumed to be functions written in the language of the linkage directive Linkage directives can be nested, so if the header contained C++ Primer, Fourth Edition a function with a linkage directive the linkage of that function is unaffected
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By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Professional The functions that C++ 2005 Pub Date: February 14, inherits from the C library are permitted to Printdefined as C functions but are not required to be C be ISBN: 0-201-72148-1 functionsit's up to each C++ implementation to decide whether to Pages: 912
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Table of Contents | Index
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implement the C library functions in C or C++
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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 Exporting Our write useful programs without first having to master every language detail Highlighting today's best readers the means to C++ Functions to Other Langauges practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance Examples the linkage directive on and explain definition, we also make a C++ the best use of the By using that take advantage of the library,a functionthe features of C++, can show how to makefunction available language As in written editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes to a programits previous in another language: 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 calledwith new programs that emphasize important points, warn about common // the calcfunction can be Filled from C learning aids pitfalls,externgood programming practices, and provide general { /* tips Complete with exercises that reinforce skills suggest "C" double calc(double dparm) usage */ } 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 the compiler generates code for this function, it will generate code appropriate to the indicated language
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Every declaration of a function defined with a linkage directive must use the same linkage directive
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Languages Supported by Linkage Directives
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A compiler is required to support linkage directives for C A compiler may provide linkage specifications for other languages For example, extern "Ada", extern "FORTRAN", and so on
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What languages are supported varies by compiler You must consult the user's guide for further information on any non-C linkage specifications it may provide
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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Professional It can be useful sometimes to compile the same source file in both C or Pub Date: February 14, 2005 C++ The preprocessor name __cplusplus (two underscores) is automatically Print ISBN:when compiling C++, so we can conditionally defined 0-201-72148-1 Pages: 912 whether we are compiling C++ include code based on
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Table of Contents | Index
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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 Overloaded Functions and Linkage learning aids that emphasize important points, warn about common styles and program design techniques Filled with new Directives pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills The interaction between linkagein its coverageThe source code for the book's extended examplesthe target learned Authoritative and comprehensive directives and function overloading depends on is available on language Ifaddress below the Web at the the language supports overloaded functions, then it is likely that a compiler that
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#ifdef __cplusplus // ok: we're compiling C++ This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help extern "C" programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last #endif edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving int strcmp(const char*, const char*);
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implements linkage directives for that language would also support overloading of these functions from C++ The only language guaranteed to be supported by C++ is C The C language does not support function overloading, so it should not be a surprise that a linkage directive can be specified only for one C function in a set of overloaded functions It is an error to declare more than one function with C linakage with a given name:
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// error: two extern "C"functions in set of overloaded functions extern "C" void print(const char*); extern "C" void print(int);
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In C++ programs, it is fairly common to overload C functions However, the other functions in the overload set must all be C++ functions:
class SmallInt { /* */ }; class BigNum { /* */ }; // the C function can be called from C and C++ programs // the C++ functions overload that function and are callable from C++ extern "C" double calc(double); extern SmallInt calc(const SmallInt&); extern BigNum calc(const BigNum&);
The C version of calc can be called from C programs and from C++ programs The additional functions are C++ functions with class parameters that can be called only from C++ programs The order of the declarations is not significant