Re: [Mingw-users] Preprocessor question

[Paul S. <pa...@is...>]

Hello Ales,

Ales Teska <te...@to...> wrote on Wednesday, November 15, 2000:


AT> Hi,

AT> this is maybe off-topic question.
AT> I want in one of my headers to change this :
AT> Log(int ID,char *Text, ...);
AT> in to this :
AT> LogFnct(MODULE_NAME,int ID,char *Text, ...);

AT> LogFnct is a library function with variable no. of params.
AT> I tried to :
AT> #define Log(x,y)    LogFnct(MODULE_NAME,x,y)
AT> It works, but the "variable" arguments were lost
AT> This :
AT> #define Log(    LogFnct(MODULE_NAME,
AT> didn`t work, preprocesor destroyed whole line, where its appers.

    Preprocessor macros should be a proper syntactic construct, not
like the last example.

AT> So question is how to use macros (#define) to substitute function
AT> with variable arguments. Or do you have another solution(s). ;))

    Standard idiom is:

#define DEBUG(x) if (debug) printf x
DEBUG(("foo=%d\n",foo))

     but that won't work for you. Then, use gcc extension:

#define foo(args...) bar(foobar, ## args)




AT> Just shine
AT> Alex


--
Paul Sokolovsky, IT Specialist
http://www.brainbench.com/transcript.jsp?pid=11135