How to make a variadic macro variable number of arguments

Question

I want to write a macro in C that accepts any number of parameters  not a specific number  example    define macro  X    something complicated  whatever  X       where X is any number of parameters  I need this because whatever is overloaded and can be called with 2 or 4 parameters   I tried defining the macro twice  but the second definition overwrote the first one   The compiler I m working with is g    more specifically  mingw

User · Answer

I don t think that s possible  you could fake it with double parens     just as long you don t need the arguments individually    define macro ARGS  some complicated  whatever ARGS         macro  a b c   macro  d e

User · Answer

define DEBUG   ifdef DEBUG    define PRINT print  else    define PRINT        void 0    strip out PRINT instructions from code  endif   void print const char  fmt              va list args      va start args  fmt       vsprintf str  fmt  args           va end args            printf   s n   str       int main        PRINT    s  d   d  Hello World    March   26  2009      return 0      If the compiler does not understand variadic macros  you can also strip out PRINT with either of the following    define PRINT      or   define PRINT if 0 print   The first comments out the PRINT instructions  the second prevents PRINT instruction because of a NULL if condition  If optimization is set  the compiler should strip out never executed instructions like  if 0  print  hello world    or   void 0

User · Answer

VA ARGS   is the standard way to do it  Don t use compiler-specific hacks if you don t have to   I m really annoyed that I can t comment on the original post  In any case  C   is not a superset of C  It is really silly to compile your C code with a C   compiler  Don t do what Donny Don t does

User · Answer

explained for g   here  though it is part of C99 so should work for everyone  http   www delorie com gnu docs gcc gcc 44 html   quick example    define debug format  args     fprintf  stderr  format  args

User · Answer

C99 way  also supported by VC   compiler    define FOO fmt       printf fmt      VA ARGS

[c] How to make a variadic macro (variable number of arguments)

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