C Macro Inserting

[Mr.Macdonald]

I want a macro

#define mac(x)

to do this

mac(add)

--Yields-->

__add__

[GeneralZod]

Do you mean something like this?



#include <stdio.h>

#define mac(x) __ ## x ## __

int main(void)
{
int mac(x) = 3;
printf("__x__ = %d", __x__);
return 0;
}



Edit:

(See here (http://gcc.gnu.org/onlinedocs/gcc-3.2.3/cpp/Concatenation.html#Concatenation) if you are curious).

[nvteighen]

Do you mean something like this?



#include <stdio.h>

#define mac(x) __ ## x ## __

int main(void)
{
int mac(x) = 3;
printf("__x__ = %d", __x__);
return 0;
}



Edit:

(See here (http://gcc.gnu.org/onlinedocs/gcc-3.2.3/cpp/Concatenation.html#Concatenation) if you are curious).

Interesting... and this is even a standard preprocessor feature!

[worksofcraft]

Interesting... and this is even a standard preprocessor feature!
Yes... once again GeneralZod explains it so completely and so succinctly. He really does know C/C++ inside out I think!

[GeneralZod]

Yes... once again GeneralZod explains it so completely and so succinctly. He really does know C/C++ inside out I think!

A long way away from this, alas :)

Oh, and I should probably point out: identifiers beginning with a double-underscore (like our __x__) are reserved for use by standard libraries and should generally be avoided, but I'm not sure if this applies only to C++ and not C.