Overloading a variadic macro

Hi. I'm using gcc with -std=c99. I want to do this:

#define myfunction (A,B) myfunction_ (__FILE__,__LINE__ ,A,B)
#define myfunction (A,B,C,...) myfunctionf_ (__FILE__,__LINE__,A,B,C,__VAR_ARGS__)

The idea is that I can call myfunction with a variable number of arguments. If there are exactly two, myfunction_ is given control. If there are three or more, myfunctionf_ is called. Is this possible in C at all?

Richard

Quote:

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Originally Posted by Richardcavell

Hi. I'm using gcc with -std=c99. I want to do this:

#define myfunction (A,B) myfunction_ (__FILE__,__LINE__ ,A,B)
#define myfunction (A,B,C,...) myfunctionf_ (__FILE__,__LINE__,A,B,C,__VAR_ARGS__)

The idea is that I can call myfunction with a variable number of arguments. If there are exactly two, myfunction_ is given control. If there are three or more, myfunctionf_ is called. Is this possible in C at all?

Richard

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c99 does not support function overloading.

Quote:

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Originally Posted by CommonTater

c99 does not support function overloading.

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Not even for a variadic macro? It's not really a function.

I guess we could do something like this, but it's not Standard C, which I want.

Code:

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#define myfunction (A,__VA_ARGS__)
{
#if __VA__NARG==2
myfunction_ ( A,__VA_ARGS__)
#elseif
myfunctionf_ (A,__VA_ARGS__)
#endif
}

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Quote:

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Originally Posted by Richardcavell

Not even for a variadic macro? It's not really a function.

I guess we could do something like this, but it's not Standard C, which I want.

Code:

---

#define myfunction (A,__VA_ARGS__)
{
#if __VA__NARG==2
myfunction_ ( A,__VA_ARGS__)
#elseif
myfunctionf_ (A,__VA_ARGS__)
#endif
}

---

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What exactly are you trying to accomplish?

Most times I find these horrible kludges, are trying to do something fairly simple in the hardest way possible....

Quote:

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Originally Posted by CommonTater

What exactly are you trying to accomplish?

Most times I find these horrible kludges, are trying to do something fairly simple in the hardest way possible....

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It goes like this: I am passing a string as a parameter. If there are no further arguments, it is printed to screen with printf ("%s", pstring ) ;, and similarly to log file.

If there are further arguments, it gets done with: printf ( pstring, ... )

Google for ppnarg. pp_narg macro - Google Search
Using this macro and concat you can now have macro overloading depending on no of args.
http://stackoverflow.com/questions/3...n-pasting-in-c

If you define multiple macros with the same name, you only get the one that's closest to you.

Code:

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#define THIS wasreplacedby
#define THIS onehere

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Quzah.