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

[Minds W. <min...@gm...>]

Hi Daneil,

My goal is only to write less code, but i like your ideia, so I will use
something like this:
#define LOG_INFO_(log) if(log->isInfoEnabled()) log->(__FILE__, __LINE__,
#define LOG_INFO LOG_INFO_(LOG)

#define LOG_DEBUG_(log) if(log->isDebugEnabled()) log->debug(__FILE__,
__LINE__,
#define LOG_DEBUG LOG_DEBUG_(LOG)

And use as:

LOG_DEBUG "x =3D %d", 2);

LOG_INFO "%s", "this is a log message");

PS: I already use a log library :)


On 12/18/05, Daniel K. O. <dan...@ya...> wrote:
>
> 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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