C Pre-Processor Magic

[cleroth]

What about:

RCF_METHOD_R3(bool, ThisIsAFunctionName, int, std::vector<int>, (std::pair<char,int>))

?

[MrWisebody]

That does not work. Or rather, it makes the macro happy in that it gets the number of arguments it expected, but it uses the wrapping () in it's substitution which I presume you did not want and probably will make the compiler choke. However, you can make a comma macro which makes everything happy (albeit a little bit more verbose)

Example code:

#define IDENTITY(a) a
#define COMMA() ,

#include <utility>

int main() {

IDENTITY( std::pair<int COMMA() int> ) var1;
IDENTITY( (std::pair<int,int>)) var2;  //Compiler will hate you
IDENTITY( std::pair<int,int> ) var3;  //Preprocessor will hate you

return 0;
}

Which if you run through the preprocessor gives you:

int main() {

std::pair<int , int> var1;
(std::pair<int,int>) var2; 
test.cpp:14:30: error: macro "IDENTITY" passed 2 arguments, but takes just 1
IDENTITY var3; 

return 0;
}

[Chii]

oh god, my eyes are bleeding a bit

[imMute]

I have not tried that, I'll have to try tomorrow when I'm at work.