c-preprocessor

I would like to generate a series of random numbers with the C preprocessor, and store them in variables for use by my program. OBJECTIVES: I would like to generate a "unique" set of random numbers every time I build my program. A small subset of the variables storing the random numbers will be overwritten with meaningful (i.e. non-random) numbers. I would like it to be impossible for a hacker, by debugging the program or comparing multiple builds, to be able to differentiate the meaningful numbers from the random numbers. I would like the build process to be automated and self-contained. I

I'm trying to overload a macro by the number of parameter. Of course I can't actually overload the macro. I've tried using variadic macros to choose the right macro (using the fact that if __VA_ARGS__ doesn't exist it's supposed to delete the last coma before it - GCC Reference ): #define TEST1() printf("TEST1"); #define TEST2() printf("TEST2"); #define CHOOSER(x, y,FUNC,...) FUNC() #define MANIMACRO(...) CHOOSER(,__VA_ARGS__,TEST1,TEST2) int main(void) { MANIMACRO(1); MANIMACRO(); } The idea was that if __VA_ARGS__ exists it should pass 4 arguments to CHOOSER , where the third one should have

This question already has an answer here : Macro in Objective-C calling isEqualToString: produces error about invalid token (1 answer) Closed 3 years ago . #define A7VERSION() ({[[[[[UIDevice currentDevice] systemVersion] componentsSeparatedByString:@"."] objectAtIndex:0] intValue];}) #define IS_OS_7 A7VERSION()>=7 The above declaration seems to compile well. But as soon as I add it a .m file I get the following exception "invalid token at start of a preprocessor expression". I am not able to understand where I could be wrong @implementation AppViewController #if IS_OS_7 …. #else …. #endif

I want to generate many sub-class which only has little difference, so I want to use macro to simplify my job. The macro define below: #define DECLARE_SUB_CLASS(sub_class_name, base_class_name, value1) \ class sub_class_name:base_class_name \ { \ public: \ virtual int initialize(const void *); \ virtual int run(const void *); \ virtual void reset(); \ virtual int output(const char*); \ virtual void terminate(); \ private: \ static const char m_szValue=#value1; \ }; I use it like this: DECLARE_SUB_CLASS(RTCount13, RTCountBase, 13); when I compiling with VC2005, it say error C2065: 'RTCount13' :

Is it possible to define something like this: #define FOO(x, y) BAR() #define FOO(x, sth, y) BAR(sth) so that this: FOO("daf", sfdas); FOO("fdsfs", something, 5); is translated to this: BAR(); BAR(something); ? Edit: Actually, BAR 's are methods of my class. Sorry for not saying that before (didn't think it was relevant). Answering DyP's question: class Testy { public: void TestFunction(std::string one, std::string two, std::string three) { std::cout << one << two << three; } void AnotherOne(std::string one) { std::cout << one; } void AnotherOne(void) { std::cout << ""; } }; #define PP_NARG(..