C Macro Tuple

TupleMacro.c

#include <stdio.h>

#define LEFT_(X, Y) X
#define LEFT(T) LEFT_ T
#define RIGHT_(X, Y) Y
#define RIGHT(T) RIGHT_ T
#define SUM(TUPLE) LEFT(TUPLE) + RIGHT(TUPLE)

int main(int argc, char *argv[]) {
    printf("%i\n", SUM((3, 4))); // -> 7
    return 0;
}