This is a preprocessor hack to emulate named parameters in C

Named C Params

#include <stdio.h>

typedef struct {
  int len;
  int * int_arr;
  char * char_arr;
} print_arr_args;

#define print_array(...) print_array_impl((print_arr_args){__VA_ARGS__})
void print_array_impl(print_arr_args args) {
  if(args.char_arr) {
    for(int i = 0; i < args.len; i++) {
      printf("arr[%d] = %c\n", i, args.char_arr[i]);
    }
  } else if(args.int_arr) {
    for(int i = 0; i < args.len; i++) {
      printf("arr[%d] = %d\n", i, args.int_arr[i]);
    }
  }
}

int main(int argc, char *argv[]) {
  print_array(.len=3, .int_arr=(int[]){1,2,3});
  print_array(.len=7, .char_arr="testing");
}