C Macros: How to map another macro to variadic arguments?

Question

I\'d like to know how to apply a unary function (or another macro) to variadic arguments of a macro, like

int f(int a);

#define apply(args...) 

        

Answer 1

Everything is possible in C if you throw enough ugly macros at it. For example, you can have an ugly function-like macro:

#include 

int f (int a)
{
  printf("%d\n", a);
}

#define SIZEOF(arr) (sizeof(arr) / sizeof(*arr))

#define apply(...)                    \
{                                     \
  int arr[] = {__VA_ARGS__};          \
  for(size_t i=0; i

Notice that 1) This would be much better off as a variadic function, and 2) it would be even better if you get rid of the variadic nonsense entirely and simply make a function such as

int f (size_t n, int array[n])