Re: [Dev-C++] #define a "function" with variable number of parameters

Per Westermark wrote:

>Given the billions of lines of existing code without use of __VA_ARGS__,
>it really isn't such an important function that it is worth it to ignore
>the current language standard.
>  
>
Agreed. I was just trying to answer the original question, but I also 
doubt that it's really needed.
As Minds Work didn't specify what problem he's trying to solve, I assume 
that the example posted could be easily solved with Per's first sugestion.

Something like this:


-----

#include <cstdarg>
#include <cstdio>

#define LOG log_prefix(__FILE__, __LINE__); log

void log_prefix(const char *file, int line)
{
    printf("%s:%d:\t", file, line);
}


// here is Per's code
void log(const char *msg,...) {
    va_list ap;

    va_start(ap,msg);
    vprintf(msg,ap);
    va_end(ap);
}

int main() {
    LOG("test %u %u\n",1,2);
    return 0;
}

-----


PS: There's also the C++ way to solve it, using ostreams and operator<<, 
that obviously won't need a variable number of parameters.
PS2: if the problem is really just logging, there are tons of C++ 
libraries that do just this - conveniently. Google a bit, maybe you can 
use one of them for your needs.


---
Daniel K. O.


	

	
		
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